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CT Elevator Mechanic study materials
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CT Elevator Mechanic practice questions

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Question 1Electrical circuits, machines and digital logic

A single-phase 230 V sub-circuit supplies a fixed resistive heating load of 3.68 kW. What is the calculated design current (Ib) for this installation?

  1. 16.0 A Correct answer.
  2. 10.0 A
  3. 8.0 A
  4. 20.5 A

Explanation

For a single-phase resistive load where cos phi = 1.0, the design current is calculated as Ib = P / U = 3680 W / 230 V = 16.0 A. This calculation represents the baseline current used to select the upstream protective device (In) and determine the required cable cross-section under DS/HD 60364.

Question 2Electrical circuits, machines and digital logic

A three-phase 400 V symmetrical resistive load has a total active power rating of 20.78 kW. What is the line current (Ib) drawn by this load?

  1. 30.0 A Correct answer.
  2. 17.3 A
  3. 52.0 A
  4. 10.0 A

Explanation

For a balanced three-phase resistive load (cos phi = 1.0), the line current is calculated using Ib = P / (sqrt(3) x U) = 20780 W / (1.732 x 400 V) = 20780 / 692.8 = 30.0 A. This current defines the required rating for the upstream three-pole circuit breaker and cable conductors.

Question 3Electrical circuits, machines and digital logic

Calculate the percentage voltage drop (Delta U %) in a 230 V single-phase circuit wired with 2.5 mm² copper conductors (conductivity gamma = 56 m/(ohm x mm²)) over a one-way length of 35 m, supplying a 10 A load at unity power factor (cos phi = 1.0).

  1. 2.17% Correct answer.
  2. 4.35%
  3. 1.09%
  4. 3.50%

Explanation

The single-phase voltage drop formula is Delta U = (2 x L x I x cos phi) / (gamma x S). Inserting the parameters: Delta U = (2 x 35 m x 10 A x 1.0) / (56 x 2.5 mm²) = 700 / 140 = 5.0 V. Expressed as a percentage of nominal 230 V: (5.0 V / 230 V) x 100% = 2.17%. Because 2.17% <= 3.0% (and <= 5.0%), this cable cross-section complies with DS/HD 60364.

Question 4Electrical circuits, machines and digital logic

A 400 V three-phase balanced distribution circuit carries a continuous load of 25 A (cos phi = 0.90) over a cable route of 40 m using 6 mm² copper conductors (gamma = 56 m/(ohm x mm²)). What is the line-to-line voltage drop (Delta U) in volts?

  1. 4.64 V Correct answer.
  2. 8.03 V
  3. 2.68 V
  4. 9.28 V

Explanation

For a three-phase circuit, the line-to-line voltage drop is Delta U = (sqrt(3) x L x I x cos phi) / (gamma x S). Inserting the values: Delta U = (1.732 x 40 x 25 x 0.90) / (56 x 6) = 1558.8 / 336 = 4.64 V. Expressed as a percentage of 400 V, this represents 1.16%, which is well within standard limits.

Question 5Electrical circuits, machines and digital logic

A 230 V single-phase cable run of 45 m delivers 16 A to an outdoor water heater. The allowable maximum voltage drop is 3% (6.9 V). Using copper (gamma = 56 m/(ohm x mm²)) and cos phi = 1.0, calculate the minimum theoretical cross-sectional area (S) needed to satisfy the voltage drop constraint.

  1. 3.73 mm² (requiring selection of standard 4.0 mm² cable) Correct answer.
  2. 2.35 mm² (permitting selection of standard 2.5 mm² cable)
  3. 1.48 mm² (permitting selection of standard 1.5 mm² cable)
  4. 5.85 mm² (requiring selection of standard 6.0 mm² cable)

Explanation

From Delta U = (2 x L x I x cos phi) / (gamma x S), rearranging for cross-section yields S = (2 x L x I x cos phi) / (gamma x Delta U). Substituting values: S = (2 x 45 m x 16 A x 1.0) / (56 x 6.9 V) = 1440 / 386.4 = 3.727 mm². Because 3.73 mm² exceeds standard 2.5 mm², the designer must specify standard 4.0 mm² cable to satisfy the 3% voltage drop limit.

Question 6Electrical circuits, machines and digital logic

In a commercial installation, an electrician must calculate the line-to-line voltage drop for a 400 V three-phase sub-main supplying a 50 A balanced inductive load (cos phi = 0.80, sin phi = 0.60) over a distance of 50 m. The cable is 10 mm² copper (R = 2.25 mohm/m at operating temperature) with inductive reactance X = 0.08 mohm/m. What is the line-to-line voltage drop (Delta U)?

  1. 8.00 V (2.00%) Correct answer.
  2. 13.86 V (3.47%)
  3. 4.62 V (1.16%)
  4. 16.00 V (4.00%)

Explanation

Total phase resistance R = 2.25 mohm/m x 50 m = 0.1125 ohm. Total reactance X = 0.08 mohm/m x 50 m = 0.004 ohm. For a balanced three-phase system: Delta U = sqrt(3) x I x (R x cos phi + X x sin phi). Substituting values: Delta U = 1.732 x 50 A x (0.1125 x 0.80 + 0.004 x 0.60) = 86.60 x (0.0900 + 0.0024) = 86.60 x 0.0924 = 8.00 V line-to-line. As a percentage of 400 V, (8.00 / 400) x 100% = 2.00%, well within the 5% limit.

Question 7Electrical circuits, machines and digital logic

An electric convector heater with a pure resistance of 23 Ω is connected to a 230 V single-phase AC circuit. What is the current flowing through the heater?

  1. 10 A Correct answer.
  2. 5 A
  3. 12 A
  4. 23 A

Explanation

According to Ohm's law, I = U / R. For a resistive load connected to 230 V with R = 23 Ω, the current is I = 230 V / 23 Ω = 10 A.

Question 8Electrical circuits, machines and digital logic

Which physical law states that the thermal power dissipated in a conductor is directly proportional to its resistance and the square of the electric current (P = R × I²)?

  1. Joule's law (Effet Joule) Correct answer.
  2. Lenz's law
  3. Faraday's law
  4. Coulomb's law

Explanation

Joule's law (l'effet Joule) defines the thermal energy released by an electric current passing through a conductor with resistance R, expressed as P = R × I² in watts (or Q = R × I² × t in joules).

Question 9Pneumatic and hydraulic model reasoning

An industrial air preparation FRL unit at the pneumatic entry of an automated production cell consists of three modular components in series. What are these three components?

  1. Filtre (filter), Régulateur / Détendeur (pressure regulator), and Lubrificateur (lubricator) Correct answer.
  2. Filtre (filter), Sécheur frigorifique (refrigerant dryer), and Réservoir tampon (air receiver)
  3. Régulateur (regulator), Clapet anti-retour (non-return valve), and Silencieux d'échappement (exhaust silencer)
  4. Flexible (hose), Raccord (fitting), and Manomètre (pressure gauge)

Explanation

An FRL unit is the standard air preparation assembly comprising a 5–40 μm particle and condensate Filter (filtre avec purge), an adjustable diaphragm Pressure Regulator (régulateur/détendeur) with pressure gauge, and an oil-mist Lubricator (lubrificateur, where air-tool lubrication is required).

Question 10Pneumatic and hydraulic model reasoning

In pneumatic machine automation, what distinguishes a 5/2 monostable directional control valve from a 5/2 bistable directional control valve?

  1. A monostable valve returns to its rest position by a mechanical spring when pilot signal is removed, while a bistable valve remains in its last switched position Correct answer.
  2. A monostable valve controls double-acting cylinders, while a bistable valve can only control single-acting cylinders
  3. A monostable valve requires two separate pilot signals to switch, while a bistable valve switches automatically via internal fluid pressure
  4. A monostable valve has 5 positions and 2 ports, whereas a bistable valve has 2 positions and 5 ports

Explanation

In pneumatic nomenclature, a 5/2 valve has 5 ports and 2 switching positions. A monostable valve has one command signal (solenoid or air pilot) and an opposing mechanical spring return (rappel par ressort) that forces the spool back to rest when de-energized. A bistable valve has two command signals (impulse memory) and stays in its last active state until the opposing signal fires.

Question 11Pneumatic and hydraulic model reasoning

Which statement accurately describes an industrial double-acting pneumatic cylinder (vérin double effet)?

  1. It has two air supply ports and produces controllable pneumatic thrust during both the extension stroke and the retraction stroke Correct answer.
  2. It has only one air supply port and utilizes an internal coil spring to execute the return stroke
  3. It has two air ports but develops exactly the same force on both strokes, because the two piston faces have identical areas
  4. It develops thrust only on extension and relies on the weight of the load or an external force to bring the rod back

Explanation

A double-acting cylinder (vérin double effet) features two pneumatic ports (one rear cap port, one front rod port). Applying air pressure to the rear extends the piston rod while exhausting the front; applying air to the front retracts the rod while exhausting the rear, generating power in both linear directions.

Question 12Pneumatic and hydraulic model reasoning

A double-acting pneumatic cylinder has a piston bore diameter of D = 63 mm. The workshop compressed air network supplies an effective gauge pressure of 6.0 bar (0.6 MPa) to the cylinder rear port. Neglecting frictional losses, what is the theoretical pushing force (effort de poussée) developed by the cylinder on extension?

  1. 1,870 N Correct answer.
  2. 187 N
  3. 7,480 N
  4. 18,700 N

Explanation

Piston radius is r = 63 mm / 2 = 31.5 mm = 3.15 cm. Piston surface area is S = π × r² = π × (3.15)² ≈ 31.17 cm² (or 3.117 × 10⁻³ m²). With pressure p = 6.0 bar = 6.0 × 10⁵ Pa = 6.0 daN/cm², theoretical thrust force is F = p × S = (6.0 × 10⁵ N/m²) × (3.117 × 10⁻³ m²) ≈ 1,870 N (or 187 daN).

Question 13Pneumatic and hydraulic model reasoning

A double-acting pneumatic cylinder with a piston bore diameter D = 63 mm has a piston rod diameter d = 20 mm. Operating at a working pressure of 6.0 bar (0.6 MPa), what is the theoretical pulling force (effort de traction) developed during the retraction stroke?

  1. 1,682 N Correct answer.
  2. 1,870 N
  3. 188 N
  4. 872 N

Explanation

During retraction, air acts only on the annular area: S_annular = (π / 4) × (D² - d²) = (π / 4) × (6.3² - 2.0²) cm² = (π / 4) × (39.69 - 4.00) = (π / 4) × 35.69 ≈ 28.03 cm² = 2.803 × 10⁻³ m². The theoretical pulling force is F_pull = p × S_annular = (6.0 × 10⁵ N/m²) × (2.803 × 10⁻³ m²) ≈ 1,682 N.

Question 14Pneumatic and hydraulic model reasoning

In the stated conventional double-acting pneumatic-cylinder example, why can meter-out flow control improve speed stability compared with unrestricted exhausting?

  1. Meter-out creates an air backpressure cushion in the exhausting chamber that prevents jerky stick-slip movements and stabilizes speed under varying loads Correct answer.
  2. Meter-out consumes half as much compressed air from the compressor network compared to meter-in control
  3. Meter-out lets a single one-way flow control valve regulate both the extension and the retraction speed, halving the component count
  4. Meter-in cannot physically be implemented on a double-acting cylinder because each port alternates between supply and exhaust

Explanation

Restricting the exhausting path can provide a stabilizing backpressure in a suitable pneumatic circuit. The actual load, pressure, components and control design determine performance. A generic flow restrictor is not a universal safe holding device, and neither meter-out nor meter-in is the best solution for every application.

Question 15Pneumatic and hydraulic model reasoning

In a pneumatic two-hand safety control circuit (commande bimanuelle), a dual-pressure valve (sélecteur à deux pressions / cellule ET) is installed. What is the operational logic of this valve, and what happens if one input receives 4.0 bar while the second input receives 6.0 bar simultaneously?

  1. The valve functions as an AND gate; output air is delivered only when both inputs are pressurized, and the lower pressure (4.0 bar) is routed to the output Correct answer.
  2. The valve functions as an OR gate; output air is delivered if either input is pressurized, routing the higher pressure (6.0 bar) to the output
  3. The valve vents all air to atmosphere whenever the input pressures differ by more than 0.5 bar
  4. The valve combines both pressures to deliver an intensified output of 10.0 bar to the cylinder

Explanation

A dual-pressure valve (cellule ET / AND gate) has a sliding spool with two seats. If only one port is pressurized, the spool slides to block that port. When both ports are pressurized, the higher pressure (6.0 bar) forces the spool against the opposite seat, allowing the lower pressure (4.0 bar) to pass through to the output port 2.

Question 16Pneumatic and hydraulic model reasoning

What fundamental physical principle forms the basis of all industrial hydraulic power transmission systems (Pascal's Law)?

  1. Pressure exerted on a confined, incompressible fluid is transmitted equally and undiminished in all directions throughout the fluid Correct answer.
  2. Fluid flow velocity increases proportionally with the square of the pipe diameter
  3. The volume of a gas decreases as its absolute temperature increases at constant pressure
  4. Frictional head loss in a pipe is independent of fluid viscosity and flow regime

Explanation

Pascal's Law states that a change in pressure applied to an enclosed, static, incompressible fluid is transmitted undiminished to every portion of the fluid and to the walls of its container, enabling hydraulic systems to multiply force (F = p × A).

Question 17Maintenance diagnosis, condition evidence and controlled restoration

Over a six-month observation period (total operating time T = 4,320 hours), an automated coil slitting line experienced 12 unscheduled breakdown stoppages. What is the Mean Time Between Failures (MTBF) and the corresponding failure rate (λ)?

  1. MTBF = 360 hours; λ ≈ 0.00278 failures/hour (2.78 × 10⁻³) Correct answer.
  2. MTBF = 12 hours; λ = 0.083 failures/hour
  3. MTBF = 51,840 hours; λ ≈ 0.000019 failures/hour
  4. MTBF = 360 days; λ = 2.78 failures/hour

Explanation

Under standard reliability definitions (AFNOR NF EN 13306): MTBF = Total Operating Time / Number of Failures = 4,320 hours / 12 = 360 hours. The failure rate λ is the reciprocal of MTBF: λ = 1 / MTBF = 1 / 360 ≈ 0.00278 failures per operating hour.

Question 18Maintenance diagnosis, condition evidence and controlled restoration

During the same six-month period on the coil slitting line, the cumulative downtime spent on active corrective repairs across all 12 breakdowns totaled 42 hours. What is the Mean Time To Repair (MTTR), which serves as the key indicator of equipment maintainability?

  1. MTTR = 0.29 hours
  2. MTTR = 3.5 hours Correct answer.
  3. MTTR = 42.0 hours
  4. MTTR = 7.0 hours

Explanation

Under AFNOR NF EN 13306: MTTR = Total Corrective Maintenance Time / Total Number of Corrective Actions = 42 hours / 12 repairs = 3.5 hours per breakdown. MTTR directly measures the maintainability of the installation and efficiency of technician troubleshooting.

Question 19Maintenance diagnosis, condition evidence and controlled restoration

In the supplied simplified availability model A=MTBF/(MTBF+MTTR), use450hours and4.5hours. What value results, excluding other logistical or scheduled delays?

  1. Ao = 90.00%
  2. Ao = 95.50%
  3. Ao = 99.01% Correct answer.
  4. Ao = 99.90%

Explanation

Operational availability is calculated using the standard reliability formula Ao = MTBF / (MTBF + MTTR) = 450 / (450 + 4.5) = 450 / 454.5 ≈ 0.9901 (99.01%). This means the rolling stand is operational and capable of production 99.01% of its scheduled operating time.

Question 20Maintenance diagnosis, condition evidence and controlled restoration

A maintenance progress group performs an AMDEC Machine (FMEA) on an automated robotic welding cell. For the failure mode 'welder positioner drive belt snapped', the team assigns: Gravity G = 4 (severe production stoppage > 4 h), Occurrence F = 3 (frequency ~once every 2 months), Non-Detection D = 3 (detected only after bad parts are produced). The plant policy mandates technical corrective action when Criticality C ≥ 30. What is the calculated Criticality Index C and what conclusion is drawn?

  1. C = G × F × D = 4 × 3 × 3 = 36; because C exceeds the threshold of 30, the progress group must design and implement a technical improvement (such as installing a non-contact inductive speed monitoring sensor to drop D to 1) Correct answer.
  2. C = G + F + D = 10; because 10 < 30, no action is required and the failure is accepted
  3. C = 4 × 3 = 12; Non-detection is never factored into AMDEC calculations
  4. C = 433; the plant must be immediately decommissioned

Explanation

For the supplied scoring model, 4×3×3=36, which exceeds its stated internal threshold30. The result triggers the specified review, not proof that a particular sensor makes the risk acceptable. Confirm appropriate safety controls and validate any change through competent engineering assessment.

Question 21Maintenance diagnosis, condition evidence and controlled restoration

Operators on an automated sheet bending press occasionally insert asymmetrical stamped blanks backward into the die, causing punch collisions and tooling damage. The maintenance technician proposes a Poka-Yoke (système anti-erreur / détrompeur) technical improvement. Which solution exemplifies a true Poka-Yoke?

  1. Placing a warning sign on the press guard instructing operators to pay closer attention
  2. Adding an asymmetrical locating guide pin (détrompeur mécanique) or optical profile sensor in the die nesting plate that physically prevents backward insertion or inhibits press cycle start if the blank orientation is incorrect Correct answer.
  3. Increasing the press speed by 50% so operators have less time to think
  4. Imposing financial fines on operators who misfeed parts

Explanation

A Poka-Yoke (mistake-proofing) is a mechanism that either makes it physically impossible to make a mistake (mechanical keying/asymmetric pin) or detects an error immediately and shuts down the operation before damage occurs (profile sensor interlock). Signs, warnings, and administrative penalties rely on human vigilance and do not constitute Poka-Yoke.

Question 22Maintenance diagnosis, condition evidence and controlled restoration

A maintenance team launches a 5S continuous improvement project in the central mechanical overhaul shop. Which pillar of the 5S methodology focuses specifically on 'Sorting' (Seiri / Débarrasser) by identifying, tagging, and removing all obsolete tools, scrap parts, and unnecessary equipment from the workspace?

  1. Seiton (Set in order / Ranger)
  2. Seiso (Shine / Nettoyer)
  3. Seiketsu (Standardize / Standardiser)
  4. Seiri (Sort / Débarrasser / Éliminer l'inutile) Correct answer.

Explanation

Seiri (Sort) is the 1st step of 5S: distinguishing between necessary and unnecessary items, red-tagging obsolete or broken equipment, and removing them from the work environment. Seiton organizes what remains, Seiso cleans, Seiketsu standardizes, and Shitsuke sustains.

Question 23Maintenance diagnosis, condition evidence and controlled restoration

As part of an Industry 4.0 predictive maintenance modernization, the maintenance department equips critical high-speed gearbox bearings with connected IO-Link condition monitoring sensors. What two physical variables are most effectively measured together in a single compact IO-Link sensor to track bearing mechanical health and early lubrication distress?

  1. Ambient relative humidity and barometric air pressure
  2. Surface contact temperature and broadband high-frequency vibration velocity/acceleration (RMS and peak) Correct answer.
  3. Optical color tint and electrical static charge
  4. Ambient sound volume in dBA and magnetic flux

Explanation

Modern industrial IIoT condition monitoring sensors (e.g. IO-Link vibration/temperature sensors from IFM, Balluff, or Banner) combine a triaxial MEMS accelerometer (measuring vibration velocity RMS for unbalance/misalignment and acceleration peak for bearing impact severity) with an integrated contact RTD/thermistor (measuring raceway thermal rise), providing complete condition tracking via digital fieldbus.

Question 24Elevator controls, maintenance evidence and Connecticut scope

In Connecticut, which state agency is responsible for licensing elevator mechanics?

  1. Department of Labor
  2. Department of Consumer Protection, Occupational & Professional Licensing Correct answer.
  3. Department of Administrative Services
  4. Department of Public Safety

Explanation

The Connecticut Department of Consumer Protection (DCP), through its Occupational & Professional Licensing division, administers elevator mechanic licensing. The DCP oversees all elevator-related licenses including R-1 through R-10 classifications under CGS Section 20-330.

Question 25Elevator controls, maintenance evidence and Connecticut scope

Under Connecticut General Statutes Section 20-330, what is the primary purpose of elevator mechanic licensing?

  1. To generate revenue for the state
  2. To ensure public safety through qualified personnel Correct answer.
  3. To limit competition in the elevator industry
  4. To standardize elevator design statewide

Explanation

CGS Section 20-330 establishes the licensing framework for elevator mechanics primarily to protect public safety. The statute ensures that only qualified, examined individuals perform installation, maintenance, and repair work on elevating devices, reducing the risk of accidents and injuries.

Question 26Elevator controls, maintenance evidence and Connecticut scope

In Connecticut, what license classification is required for a company that installs new elevators?

  1. R-2 Journeyperson
  2. R-1 Contractor Correct answer.
  3. R-5 Limited
  4. R-10 Apprentice

Explanation

The R-1 Contractor license is required for companies or individuals overseeing the installation of new elevators in Connecticut. This is the highest classification and requires at least 2 years of experience as a licensed R-2 Journeyperson before qualifying.

Question 27Elevator controls, maintenance evidence and Connecticut scope

A supplied site maintenance-control program requires traceable maintenance actions, relevant tests and inspection evidence. Which listed documentation set supports that defined record requirement, without asserting every current Connecticut interval or code clause?

  1. Only the original installation contract
  2. A maintenance control program (MCP) including maintenance records, test reports, and inspection certificates Correct answer.
  3. The building's floor plans only
  4. A list of all previous passengers

Explanation

Connecticut requires a maintenance control program (MCP) for every elevator, which includes maintenance logs, test results, inspection certificates, and records of repairs and alterations. This documentation must be available for review by the DCP inspector during periodic inspections.

Question 28Elevator controls, maintenance evidence and Connecticut scope

Under Connecticut building code, what is the required minimum size of an elevator machine room?

  1. 50 square feet
  2. It must be large enough to allow safe access to all equipment with required clearances Correct answer.
  3. 100 square feet
  4. 200 square feet

Explanation

Connecticut code does not specify a fixed minimum square footage for machine rooms. Instead, the room must be large enough to provide safe access to all equipment with required working clearances per NEC and ASME A17.1. This includes space around the controller, motor, and disconnect switch.

Question 29Elevator controls, maintenance evidence and Connecticut scope

Under Connecticut code, what is required when performing maintenance on an elevator that requires entering the hoistway?

  1. Only verbal notification to the building manager
  2. Lockout/tagout procedures and proper personal protective equipment Correct answer.
  3. A police escort
  4. Written permission from the elevator manufacturer

Explanation

Work that exposes hoistway hazards requires the actual authorized access, isolation, stored-energy and protective process with suitable equipment and competent responsibility. A generic lockout label or one stop switch is not complete protection against every possible motion or exposure. This written choice authorizes no entry or live work.

Question 30Elevator controls, maintenance evidence and Connecticut scope

What is the purpose of Phase I emergency recall operation (firefighters' service) on an elevator?

  1. To allow firefighters to manually operate the elevator during a fire emergency
  2. To automatically recall the elevator to a designated floor upon activation of a fire alarm or smoke detector Correct answer.
  3. To shut down all elevators permanently during a fire
  4. To activate the sprinkler system in the hoistway

Explanation

The described Phase I function recalls the car under the actual fire-service design, which can include designated or alternate landing behavior. It is distinct from ordinary calls and from the firefighter’s subsequent controlled operation. Do not improvise a live test or assume one landing is always safe.

Question 31Elevator controls, maintenance evidence and Connecticut scope

In Phase II firefighters' service operation, who has control of the elevator?

  1. The building manager
  2. The fire department personnel using a special key Correct answer.
  3. The elevator automatically runs to each floor
  4. The elevator maintenance company via remote control

Explanation

The stated Phase II mode provides the designed firefighter-controlled operation using the actual authorized controls and procedures. It is not a general passenger or maintenance mode and does not make every route safe during a fire. Written recognition does not authorize emergency elevator use.

Question 32Elevator controls, maintenance evidence and Connecticut scope

In Connecticut, what action must a mechanic take if they discover a hazardous condition during routine maintenance?

  1. Document it in the maintenance log and continue working
  2. Immediately take the elevator out of service and notify the building owner and authority having jurisdiction Correct answer.
  3. Schedule a repair for the following week
  4. Notify the elevator manufacturer only

Explanation

A discovered hazardous condition requires controlled removal from normal use, appropriate protection and responsible notification under the actual procedure. Do not assume a generic fault is safe to reset or that a written item grants authority to repair or release the equipment. Current Connecticut authority and the responsible competent process govern.

Question 33Elevator controls, maintenance evidence and Connecticut scope

What is the purpose of a seismic switch on an elevator in Connecticut?

  1. To increase elevator speed during an earthquake
  2. To detect seismic activity and shut down the elevator for inspection before returning to service Correct answer.
  3. To reinforce the hoistway walls
  4. To activate the sprinkler system

Explanation

A seismic switch detects earthquake activity and automatically takes the elevator out of service, typically returning it to the nearest floor and opening the doors. The elevator cannot be returned to normal service until a qualified mechanic inspects it for damage, per ASME A17.1 seismic requirements.

Question 34Elevator controls, maintenance evidence and Connecticut scope

What is the function of door reopening devices (safety edges or photo eyes) on elevator doors?

  1. To keep doors open permanently
  2. To detect obstructions in the door path and reverse the closing doors to prevent injury Correct answer.
  3. To lock doors in the closed position
  4. To increase door closing speed

Explanation

The intended reopening device detects a relevant obstruction and commands the specified door response. Coverage, response, actual door force and other protective functions still matter. It does not guarantee prevention of every injury or replace proper maintenance and the complete approved door system.

Question 35Elevator mechanical systems, load paths and hydraulic principles

What is the function of an interlock on an elevator hoistway door?

  1. It controls the speed of the elevator car
  2. It prevents the door from opening unless the car is at the landing Correct answer.
  3. It activates the emergency lighting system
  4. It monitors the weight in the elevator car

Explanation

The intended door-lock arrangement controls unsafe access and relevant movement conditions under the actual elevator design. Authorized unlocking or special modes must follow the manufacturer and governing procedures. A component name alone does not establish complete safe access or permission to enter a hoistway.

Question 36Elevator mechanical systems, load paths and hydraulic principles

What is the purpose of the terminal stopping device on an elevator?

  1. To stop the doors from closing
  2. To prevent the car from traveling past the top or bottom terminal floors Correct answer.
  3. To disconnect power at the end of the day
  4. To alert passengers at the terminal floor

Explanation

Terminal stopping devices (normal and final limits) prevent the elevator car from traveling past the uppermost or lowermost terminal floors. The normal terminal stopping device initiates deceleration, while the final terminal stopping device is a backup that removes power if the car overruns the normal stop.

Question 37Elevator controls, maintenance evidence and Connecticut scope

Under ASME A17.2 (used in Connecticut inspections), what is an 'acceptance inspection'?

  1. A routine annual check
  2. The initial inspection of a new or altered elevator before it is placed in public service Correct answer.
  3. An inspection performed by the building owner
  4. A voluntary inspection for insurance purposes

Explanation

An acceptance inspection is the comprehensive initial inspection performed on a newly installed or significantly altered elevator before it is placed in public service. It verifies compliance with all applicable codes and standards. In Connecticut, this must be performed by a DCP-authorized inspector.

Question 38Elevator mechanical systems, load paths and hydraulic principles

What is the purpose of the governor rope in a traction elevator system?

  1. It drives the main sheave of the elevator
  2. It connects the governor to the safety device on the car frame Correct answer.
  3. It provides power to the elevator car lights
  4. It opens the hoistway doors at each landing

Explanation

The governor rope connects the governor at the top of the hoistway to the safety device mounted on the car frame. When the governor detects an overspeed condition, it grips the governor rope, which in turn activates the safety device to clamp the guide rails and stop the car.

Question 39Elevator mechanical systems, load paths and hydraulic principles

What is the purpose of a car safety device (safeties) on a traction elevator?

  1. To prevent the doors from opening between floors
  2. To stop the car by clamping the guide rails in case of overspeed or free fall Correct answer.
  3. To monitor the weight capacity of the car
  4. To provide emergency lighting during a power failure

Explanation

The specified car safety acts through its designed guide-rail engagement under the relevant triggering condition. It is distinct from the machine brake, governor sensing and normal leveling functions. Actual type, direction, speed and test requirements depend on the equipment and applicable code, not a universal release or test recipe.

Question 40Elevator mechanical systems, load paths and hydraulic principles

What is the purpose of compensation chains or ropes on high-rise traction elevators?

  1. To provide additional lifting capacity
  2. To equalize the weight of the hoist ropes on both sides of the sheave as the car travels Correct answer.
  3. To serve as a backup in case the main ropes break
  4. To reduce noise during elevator operation

Explanation

Compensation chains or ropes are attached to the bottom of the car and counterweight to equalize the weight of the hoist ropes on both sides of the drive sheave. In tall buildings, the significant weight of long hoist ropes would create an imbalance without compensation, affecting motor performance.

Question 41Elevator mechanical systems, load paths and hydraulic principles

What is the primary purpose of a rope gripper device on a traction elevator?

  1. To grip passengers entering the car
  2. To grip the hoist ropes and stop the car if the machine brake fails or rope slippage is detected Correct answer.
  3. To tighten loose ropes during maintenance
  4. To attach the ropes to the counterweight

Explanation

A suitable emergency braking arrangement can act on the suspension under the actual triggering and equipment design. It is distinct from normal drive control and must be selected, installed and verified as a complete protective function. The name does not guarantee detection of every brake or traction failure.

Question 42Elevator mechanical systems, load paths and hydraulic principles

What is the primary purpose of the machine brake on a traction elevator?

  1. To slow down the car during normal operation
  2. To hold the car stationary when the motor is not running and to stop the car in an emergency Correct answer.
  3. To increase the speed of the car
  4. To prevent the doors from opening

Explanation

The machine brake provides the designed holding and stopping function under the actual elevator architecture. It is not interchangeable with every car safety, governor or emergency brake. Actual drive sequencing, load, wear and protective verification matter; no universal brake adjustment or live test follows from the label.

Question 43Elevator controls, maintenance evidence and Connecticut scope

What is the function of a load-weighing device in an elevator system?

  1. It controls the lighting level inside the car
  2. It measures the load in the car to optimize motor torque and prevent overloading Correct answer.
  3. It tracks the number of passengers for building security
  4. It adjusts the door opening speed

Explanation

Load-weighing devices measure the weight inside the elevator car. They serve multiple functions: preventing the car from operating when overloaded, optimizing motor torque for smooth starts, and enabling features like bypass of hall calls when the car is near capacity.

Question 44Elevator controls, maintenance evidence and Connecticut scope

What type of elevator drive system uses a variable frequency drive (VFD) to control motor speed?

  1. Single-speed AC motor system
  2. Two-speed AC motor system
  3. AC variable voltage variable frequency (VVVF) system Correct answer.
  4. Ward-Leonard DC motor system

Explanation

An AC VVVF (variable voltage variable frequency) system uses a VFD to control the speed of the AC motor by varying both the voltage and frequency of the power supplied. This provides smooth acceleration and deceleration, energy efficiency, and precise floor leveling - it is the most common modern drive type.

Question 45Elevator controls, maintenance evidence and Connecticut scope

What is the purpose of a leveling device on an elevator?

  1. To level the machine room floor
  2. To ensure the car floor aligns precisely with the landing floor at each stop Correct answer.
  3. To balance the counterweight
  4. To adjust the governor speed

Explanation

A leveling device automatically adjusts the position of the elevator car so that its floor is precisely aligned with the landing floor. This prevents tripping hazards and ensures smooth entry and exit. ASME A17.1 specifies maximum permitted leveling tolerances, typically within 1/2 inch.

Question 46Elevator controls, maintenance evidence and Connecticut scope

What is the function of the selector in an elevator control system?

  1. It selects which elevator in a group responds to a call
  2. It tracks the position of the car in the hoistway and determines stopping points Correct answer.
  3. It selects the type of music played in the car
  4. It chooses the appropriate wire rope for the installation

Explanation

The selector is a device that continuously tracks the position of the elevator car within the hoistway. It provides position information to the controller so the system knows when to initiate slowdown and stopping at the correct floor. Modern systems use encoders and magnetic sensors for this function.

Question 47Elevator controls, maintenance evidence and Connecticut scope

What is the function of a regenerative drive on a traction elevator?

  1. It provides backup battery power during outages
  2. It captures energy during descent and feeds it back to the building's electrical system Correct answer.
  3. It regenerates worn wire ropes
  4. It recharges the emergency battery for car lighting

Explanation

A regenerative drive can return braking energy to the designed electrical path when the actual force balance and direction permit it. A loaded descent or sufficiently light ascent can generate under suitable conditions; descent alone does not guarantee regeneration. The drive can retain hazardous electrical energy and written recognition authorizes no access.

Question 48Elevator controls, maintenance evidence and Connecticut scope

In a group elevator system, what does 'dispatching' refer to?

  1. Sending a mechanic to perform repairs
  2. The logic that determines which elevator in a group responds to a hall call Correct answer.
  3. Shipping elevator parts to a job site
  4. The process of installing a new elevator

Explanation

Dispatching in a group elevator system refers to the control logic that determines which elevator car should respond to a particular hall call. Modern dispatching algorithms consider factors like car position, direction of travel, current load, and wait times to optimize passenger service and minimize wait times.

Question 49Elevator controls, maintenance evidence and Connecticut scope

What is the function of the traveling cable in an elevator system?

  1. It supports the weight of the elevator car
  2. It carries electrical power, communication signals, and data between the car and the controller Correct answer.
  3. It provides ventilation to the hoistway
  4. It serves as a backup hoist rope

Explanation

The traveling cable is a flexible cable that connects the elevator car to the stationary controller in the machine room. It carries power for car lights, door operator, and fans, as well as communication signals, position data, and intercom lines. It must withstand continuous flexing as the car moves.

Question 50Elevator controls, maintenance evidence and Connecticut scope

What type of motor is most commonly used in modern machine-room-less (MRL) traction elevators?

  1. DC shunt motor
  2. Single-phase AC induction motor
  3. Permanent magnet synchronous motor (PMSM) Correct answer.
  4. Steam-powered motor

Explanation

Permanent magnet synchronous motors (PMSMs) are the standard for modern MRL elevators. They are compact, energy-efficient, and produce high torque at low speeds without requiring a gearbox. This allows the machine to be installed in the hoistway, eliminating the need for a separate machine room.