UAE Engineer Exam flashcards

33 cards. Read the term and the definition here. The deck at the top of this page is optional.

Hooke's Law

Within the elastic limit, stress is directly proportional to strain, expressed as σ = E·ε, where E is the modulus of elasticity of the material.

Reynolds Number

Dimensionless ratio Re = ρvD/μ that predicts flow regime: values below about 2000 indicate laminar flow, above about 4000 indicate turbulent flow.

Bernoulli Equation

For steady, incompressible, frictionless flow along a streamline, pressure head plus velocity head plus elevation head remains constant: p/γ + v²/2g + z.

Beam Bending Stress

Flexural stress in a beam is σ = My/I, where M is bending moment, y is distance from the neutral axis, and I is the second moment of area.

Three-Phase Power

Real power delivered by a balanced three-phase load equals P = √3·V_line·I_line·cos φ, where cos φ is the power factor.

Concrete Characteristic Strength

The 28-day strength fck below which no more than 5 percent of test results are expected to fall, used as the basis for structural design.

Pump Affinity Laws

For a centrifugal pump, flow varies with speed, head with the square of speed, and absorbed power with the cube of speed.

Transformer Maximum Efficiency

A transformer reaches peak efficiency when its variable copper losses equal its constant core losses, which occurs at a specific load fraction.

Cathodic Protection

A corrosion-control method that makes the protected metal the cathode by supplying sacrificial anodes or an impressed direct current.

Sensible Heat Formula

Cooling or heating load for air is Q = 1.2 × volumetric flow rate in m³/s × temperature difference in °C, giving kilowatts.

Otto Cycle Efficiency

Ideal spark-ignition efficiency equals 1 − 1/r^(γ−1), where r is the compression ratio and γ is the specific heat ratio.

Design (Safety) Factor

Ratio of failure strength to allowable working stress, providing margin against uncertainty in loads, materials, and analysis.

Euler Column Buckling

Critical buckling load for a slender column is P_cr = π²EI/(KL)², where K depends on end support conditions.

Tolerance Stack-Up

Worst-case assembly tolerance is the sum of component tolerances; statistical stack-up uses the root sum of squares of tolerances.

Series System Reliability

For components arranged so all must function, system reliability equals the product of individual component reliabilities, always lower than any single component.

Fatigue Endurance Limit

Stress amplitude below which a steel component can sustain an essentially infinite number of cycles, commonly taken at 10⁶ cycles.

Finite Element Convergence

Condition where further mesh refinement changes results negligibly, indicating the numerical model has resolved the stress field adequately.

Code Versus Standard

A code is a legally adopted set of minimum requirements; a standard is a consensus technical document referenced by codes or contracts.

Authority Having Jurisdiction

The organisation or official empowered to enforce code requirements, issue permits, and approve installations before occupancy or use.

Hazardous Area Zones

IEC 60079 classification of explosive atmospheres: Zone 0/1/2 for gases and Zone 20/21/22 for dusts, by likelihood of presence.

ASME Boiler and Pressure Vessel Code

Widely referenced standard specifying design, materials, fabrication, inspection, and testing requirements for pressure-retaining equipment.

Compliance Traceability

Documented linkage from each regulatory requirement to objective evidence such as test reports, certificates, or inspection records.

Hierarchy of Controls

Risk-reduction order: elimination, substitution, engineering controls, administrative controls, and personal protective equipment last.

Risk Score Matrix

A semi-quantitative ranking obtained by multiplying the likelihood of a hazardous event by the severity of its consequences.

Confined Space Entry

Entry into a restricted space requires atmospheric testing, an entry permit, a standby attendant, and a rescue plan.

Lockout Tagout

Procedure that isolates and secures all hazardous energy sources before maintenance, followed by verification of a zero-energy state.

Net Present Value

Sum of discounted future cash flows minus initial investment; a positive value means the project exceeds the required rate of return.

Internal Rate of Return

The discount rate that makes a project's net present value equal zero; projects are accepted when it exceeds the hurdle rate.

Critical Path

The longest sequence of dependent activities through a network, having zero total float and determining the minimum project duration.

Cost Performance Index

Earned value divided by actual cost; a value below one indicates the project is spending more than the work earned.

Break-Even Quantity

Output level at which total revenue equals total cost, calculated as fixed costs divided by unit price minus unit variable cost.

Paramount Public Safety Duty

The professional obligation to hold the health, safety, and welfare of the public above the interests of clients or employers.

Seal and Signature Rules

Engineers sign and seal only documents they prepared or directly supervised, after adequate review, within their area of competence.