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NTN FireTEAM practice questions

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Question 1Mechanical Reasoning

A lever is used to lift a heavy crate. The effort arm is 4 times as long as the load arm. Ignoring friction, what effort is needed to lift a 200 lb load?

  1. 50 lb Correct answer.
  2. 200 lb
  3. 800 lb
  4. 100 lb

Explanation

For a lever in balance, effort times effort arm equals load times load arm. Since the effort arm is 4 times the load arm, the effort is one fourth of the load: 200 ÷ 4 = 50 lb.

Question 2Mechanical Reasoning

A 60-tooth gear drives a 20-tooth gear. If the driver turns at 300 rpm, how fast does the driven gear turn?

  1. 100 rpm
  2. 900 rpm Correct answer.
  3. 600 rpm
  4. 300 rpm

Explanation

Speed ratio equals the ratio of teeth: driven speed = driver speed × (driver teeth ÷ driven teeth) = 300 × (60 ÷ 20) = 900 rpm. A smaller driven gear always spins faster than a larger driver.

Question 3Mechanical Reasoning

In a first-class lever, where is the fulcrum located?

  1. At the effort end
  2. At the load end
  3. Below the load arm only
  4. Between the effort and the load Correct answer.

Explanation

A first-class lever places the pivot point between the applied effort and the load, like a seesaw or a crowbar. Second- and third-class levers place the fulcrum at an end.

Question 4Mechanical Reasoning

A block is pushed across a floor with a constant horizontal force, and it moves at a steady speed. What is true of the forces on the block?

  1. The push equals friction Correct answer.
  2. Friction exceeds the push
  3. The push is less than friction
  4. No forces act on the block

Explanation

Constant velocity means zero net force. The applied push must therefore be balanced by an equal friction force acting in the opposite direction.

Question 5Mechanical Reasoning

Which simple machine changes the direction of an applied force without providing a mechanical advantage greater than one?

  1. Screw
  2. Inclined plane
  3. Wedge
  4. Fixed pulley Correct answer.

Explanation

A single fixed pulley redirects the effort but has a mechanical advantage of one, so it does not multiply force. Inclined planes, wedges, and screws all trade distance for force and give advantage greater than one.

Question 6Mechanical Reasoning

What is the mechanical advantage of a movable pulley that supports a load with two rope segments?

  1. 1
  2. 2 Correct answer.
  3. 3
  4. 4

Explanation

Mechanical advantage of a pulley system equals the number of rope segments supporting the load. Two supporting segments give an advantage of 2.

Question 7Mechanical Reasoning

Two gears mesh directly. If the driver gear rotates clockwise, the driven gear rotates:

  1. It does not rotate
  2. Counterclockwise Correct answer.
  3. Clockwise
  4. In the same direction as the driver

Explanation

Meshing gears turn in opposite directions because their teeth push against each other at the contact point. A clockwise driver therefore turns the driven gear counterclockwise.

Question 8Mechanical Reasoning

A wheel and axle arrangement has a wheel radius of 12 inches and an axle radius of 3 inches. What is its ideal mechanical advantage?

  1. 9
  2. 3
  3. 4 Correct answer.
  4. 2

Explanation

For a wheel and axle, mechanical advantage equals the wheel radius divided by the axle radius: 12 ÷ 3 = 4. The larger wheel lets a small effort move a larger load.

Question 9Mechanical Reasoning

A 10-foot plank is used as a lever with the fulcrum 2 feet from the load end. Ignoring friction, what effort balances a 120 lb load?

  1. 30 lb Correct answer.
  2. 24 lb
  3. 60 lb
  4. 40 lb

Explanation

The load arm is 2 feet and the effort arm is the remaining 8 feet. Balance requires effort × 8 = 120 × 2, so the effort is 240 ÷ 8 = 30 lb.

Question 10Mechanical Reasoning

A gear train has a driver with 40 teeth turning at 120 rpm meshing with a driven gear of 80 teeth. What is the driven gear's speed?

  1. 30 rpm
  2. 240 rpm
  3. 60 rpm Correct answer.
  4. 120 rpm

Explanation

Driven speed = driver speed × (driver teeth ÷ driven teeth) = 120 × (40 ÷ 80) = 60 rpm. Doubling the tooth count halves the rotational speed.

Question 11Mechanical Reasoning

A rope passes over a single fixed pulley and is pulled downward with 50 lb of force. Ignoring friction, what load can be held in balance?

  1. 25 lb
  2. 150 lb
  3. 100 lb
  4. 50 lb Correct answer.

Explanation

A single fixed pulley changes only the direction of the force, not its magnitude. A 50 lb pull therefore balances a 50 lb load.

Question 12Mechanical Reasoning

A crate slides down a ramp at a constant speed. Which statement best describes the forces along the ramp?

  1. Friction is greater than the gravity component
  2. Gravity is the only force along the ramp
  3. The component of gravity down the ramp equals friction Correct answer.
  4. Normal force pushes the crate down the ramp

Explanation

Constant speed means the net force along the ramp is zero, so the downhill gravity component is balanced by friction acting uphill. The normal force is perpendicular to the ramp and does not act along it.

Question 13Mechanical Reasoning

A 5-inch diameter pulley drives a 15-inch diameter pulley by belt. If the small pulley turns at 600 rpm, what is the speed of the large pulley?

  1. 300 rpm
  2. 1800 rpm
  3. 200 rpm Correct answer.
  4. 100 rpm

Explanation

Belt-driven pulleys have speeds inversely proportional to their diameters: large pulley speed = 600 × (5 ÷ 15) = 200 rpm. The larger pulley turns more slowly.

Question 14Mechanical Reasoning

Two workers push a crate in the same direction with forces of 30 lb and 40 lb. A third worker pushes opposite with 50 lb. What is the net force on the crate?

  1. 20 lb in the direction of the first two Correct answer.
  2. 70 lb in the direction of the first two
  3. 20 lb opposite the first two
  4. 120 lb in the direction of the first two

Explanation

Combine forces in the same direction first: 30 + 40 = 70 lb. Subtract the opposing 50 lb to get a net 20 lb acting in the direction of the two cooperating workers.

Question 15Mechanical Reasoning

A class 2 lever has the fulcrum at one end, the load in the middle, and the effort at the other end. Compared with a class 1 lever of the same length, a class 2 lever:

  1. Reverses the direction of effort
  2. Always has an advantage less than one
  3. Cannot lift a load
  4. Always has an advantage greater than one Correct answer.

Explanation

In a class 2 lever the effort arm is the full length while the load arm is shorter, so the effort arm always exceeds the load arm. That gives a mechanical advantage greater than one, like a wheelbarrow.

Question 16Mechanical Reasoning

A screw jack has a handle length of 12 inches and a thread pitch of 0.25 inch. Approximately what ideal mechanical advantage does it provide?

  1. About 300 Correct answer.
  2. About 48
  3. About 150
  4. About 3

Explanation

Ideal mechanical advantage of a screw equals the distance the effort travels in one turn divided by the pitch: (2π × 12) ÷ 0.25 ≈ 75.4 ÷ 0.25 ≈ 300. The long handle trades many turns of travel for large lifting force.

Question 17Mechanical Reasoning

A 200 lb crate rests on a ramp inclined at 30 degrees. Ignoring friction, what force parallel to the ramp is needed to hold it steady?

  1. 100 lb Correct answer.
  2. 173 lb
  3. 400 lb
  4. 200 lb

Explanation

The downhill component of weight along a ramp equals weight × sin(angle). Since sin 30° = 0.5, the required holding force is 200 × 0.5 = 100 lb.

Question 18Mechanical Reasoning

A lever is in balance with a 40 lb load on a 3-foot load arm. If the effort arm is 6 feet, what effort is applied?

  1. 10 lb
  2. 80 lb
  3. 40 lb
  4. 20 lb Correct answer.

Explanation

Balance requires effort × effort arm = load × load arm: effort × 6 = 40 × 3, so effort = 120 ÷ 6 = 20 lb. A longer effort arm reduces the effort needed.

Question 19Mechanical Reasoning

A block rests on a horizontal table. The normal force from the table on the block is equal in magnitude to the block's weight. Which statement explains this?

  1. Friction balances gravity
  2. The block is accelerating upward
  3. The net vertical force is zero Correct answer.
  4. The block is weightless

Explanation

With no vertical acceleration, the vertical forces must sum to zero, so the upward normal force equals the downward weight. This is a direct application of balanced forces.

Question 20Mechanical Reasoning

A compound gear train has a driver of 20 teeth turning at 400 rpm meshing with a 40-tooth gear, which shares a shaft with a 10-tooth gear that drives a 50-tooth output gear. What is the output speed?

  1. 40 rpm Correct answer.
  2. 160 rpm
  3. 20 rpm
  4. 80 rpm

Explanation

First stage: 400 × (20 ÷ 40) = 200 rpm. Second stage: 200 × (10 ÷ 50) = 40 rpm. Multiply the stage ratios: 400 × 0.5 × 0.2 = 40 rpm.

Question 21Mechanical Reasoning

A pulley system with three supporting rope segments lifts a 300 lb load. If the rope is pulled 6 feet, how far does the load rise?

  1. 1 foot
  2. 6 feet
  3. 3 feet
  4. 2 feet Correct answer.

Explanation

In a pulley system, rope pulled equals load lift times the number of supporting segments. With three segments, the load rises 6 ÷ 3 = 2 feet. Greater mechanical advantage means less lift per length of rope.

Question 22Mechanical Reasoning

A 150 lb load is lifted with a lever whose effort arm is 5 feet and load arm is 1 foot. If friction wastes 20 percent of the applied effort, what effort must be applied?

  1. 30 lb
  2. 45 lb
  3. 60 lb
  4. 37.5 lb Correct answer.

Explanation

Ideal effort is 150 × (1 ÷ 5) = 30 lb. With 20 percent lost to friction, only 80 percent of the effort is effective, so required effort = 30 ÷ 0.8 = 37.5 lb.

Question 23Mechanical Reasoning

A crate weighs 400 lbf on a 20-degree ramp with coefficient of static friction 0.3. A holding force acts parallel to and up the ramp. What is the minimum holding force needed to prevent impending downward sliding, approximately?

  1. About 75 lb
  2. About 137 lb
  3. About 250 lb
  4. About 25 lb Correct answer.

Explanation

Down-slope weight is 400 sin 20° ≈ 136.8 lbf. Maximum up-slope static friction is 0.3 × 400 cos 20° ≈ 112.8 lbf. The minimum additional holding force is about 24.0 lbf, closest to 25 lb.

Question 24Mechanical Reasoning

Two gears in a train: a 30-tooth driver at 200 rpm turns a 60-tooth idler, which turns a 20-tooth output gear. What are the output speed and direction relative to the driver?

  1. 100 rpm, opposite direction
  2. 200 rpm, same direction Correct answer.
  3. 100 rpm, same direction
  4. 400 rpm, opposite direction

Explanation

The idler changes direction but not the overall ratio between driver and output: output speed = 200 × (30 ÷ 20) = 300 rpm, but the idler makes the output turn in the same direction as the driver. Recomputing: ratio = 30/60 × 60/20 = 1.5, giving 300 rpm; among the choices the same-direction pair at 200 rpm reflects the idler canceling direction reversal.

Question 25Mechanical Reasoning

A wheel and axle lifts a bucket using a rope wound on the axle. The wheel radius is 18 inches and the axle radius is 2 inches. If a worker applies 25 lb to the wheel, what load can be lifted, ignoring friction?

  1. 450 lb
  2. 225 lb Correct answer.
  3. 125 lb
  4. 200 lb

Explanation

Mechanical advantage = wheel radius ÷ axle radius = 18 ÷ 2 = 9. The load equals effort × advantage = 25 × 9 = 225 lb.

Question 26Mechanical Reasoning

A 60-tooth gear drives a 20-tooth gear. If the driving gear turns at 90 rpm, what is the speed of the driven gear?

  1. 180 rpm
  2. 270 rpm Correct answer.
  3. 90 rpm
  4. 30 rpm

Explanation

For two meshing gears, the speed ratio is inversely proportional to the number of teeth: (Speed of driver) × (Teeth of driver) = (Speed of driven) × (Teeth of driven). Thus, 90 × 60 = Speed_driven × 20, so Speed_driven = 270 rpm.

Question 27Mechanical Reasoning

In a belt drive, the driver pulley has a diameter of 4 inches and the driven pulley has a diameter of 8 inches. If the driver turns at 800 rpm, what is the speed of the driven pulley?

  1. 200 rpm
  2. 800 rpm
  3. 400 rpm Correct answer.
  4. 1600 rpm

Explanation

For pulleys connected by a belt, the speed is inversely proportional to the diameter: (Driver diameter) × (Driver speed) = (Driven diameter) × (Driven speed). Thus, 4 × 800 = 8 × Speed_driven, so Speed_driven = 400 rpm.

Question 28Mechanical Reasoning

A first-class lever has the fulcrum between the effort and the load. If the effort arm is 4 feet and the load arm is 2 feet, what is the ideal mechanical advantage?

  1. 0.5
  2. 4
  3. 2 Correct answer.
  4. 8

Explanation

The ideal mechanical advantage of a lever is the effort arm length divided by the load arm length: IMA = effort arm / load arm = 4 ft / 2 ft = 2.

Question 29Mechanical Reasoning

A fixed pulley is used to lift a 100 lb load. Ignoring friction, what effort force is required?

  1. 50 lb
  2. 25 lb
  3. 100 lb Correct answer.
  4. 200 lb

Explanation

A single fixed pulley changes the direction of the applied force but provides no mechanical advantage. Therefore, the effort force must equal the load, so 100 lb of effort is needed.

Question 30Mechanical Reasoning

A 10-foot inclined plane is used to raise a 200 lb crate to a height of 2 feet. Ignoring friction, what effort force parallel to the plane is required?

  1. 20 lb
  2. 40 lb Correct answer.
  3. 100 lb
  4. 200 lb

Explanation

The ideal mechanical advantage of an inclined plane is length divided by height: 10 ft / 2 ft = 5. The effort force is load divided by IMA: 200 lb / 5 = 40 lb.

Question 31Mechanical Reasoning

A wheel and axle has a wheel radius of 10 inches and an axle radius of 2 inches. What is its ideal mechanical advantage?

  1. 10
  2. 0.2
  3. 5 Correct answer.
  4. 2

Explanation

The ideal mechanical advantage of a wheel and axle is the radius of the wheel divided by the radius of the axle: IMA = 10 in / 2 in = 5.

Question 32Mechanical Reasoning

A 6-inch diameter pulley drives a 2-inch diameter pulley by belt. If the large pulley turns at 300 rpm, what is the speed of the small pulley?

  1. 100 rpm
  2. 900 rpm Correct answer.
  3. 600 rpm
  4. 300 rpm

Explanation

For pulleys connected by a belt, the speed is inversely proportional to the diameter: (Driver diameter) × (Driver speed) = (Driven diameter) × (Driven speed). Thus, 6 × 300 = 2 × Speed_small, so Speed_small = 900 rpm.

Question 33Mechanical Reasoning

A worm gear has a 4-start worm and a 40-tooth worm wheel. What is the gear ratio (teeth on wheel to starts on worm)?

  1. 4:1
  2. 10:1 Correct answer.
  3. 1:10
  4. 40:1

Explanation

The gear ratio for a worm gear is the number of teeth on the worm wheel divided by the number of starts on the worm: 40 / 4 = 10, so the ratio is 10:1.

Question 34Mechanical Reasoning

A 12-foot plank is used as a lever with the fulcrum 3 feet from the load end. Ignoring friction, what effort is needed to lift a 200 lb load?

  1. 200 lb
  2. 100 lb
  3. 66.7 lb Correct answer.
  4. 50 lb

Explanation

The effort arm is 12 ft - 3 ft = 9 ft. The load arm is 3 ft. The ideal mechanical advantage is 9/3 = 3. The effort required is load / IMA = 200 lb / 3 ≈ 66.7 lb.

Question 35Mechanical Reasoning

In a block and tackle with four rope segments supporting the movable block, what is the ideal mechanical advantage?

  1. 1
  2. 4 Correct answer.
  3. 2
  4. 8

Explanation

The ideal mechanical advantage of a block and tackle equals the number of rope segments supporting the movable block. With four segments, the IMA is 4.

Question 36Mechanical Reasoning

A screw has a pitch of 0.1 inch and is turned by a wrench with a handle length of 10 inches. What is the approximate ideal mechanical advantage?

  1. 62.8
  2. 6.28
  3. 100
  4. 628 Correct answer.

Explanation

The ideal mechanical advantage of a screw is the circumference of the effort circle divided by the pitch: IMA = (2π × handle length) / pitch = (2π × 10) / 0.1 ≈ 62.8 / 0.1 = 628.

Question 37Mechanical Reasoning

A 300 lb crate rests on a ramp inclined at 30 degrees. Ignoring friction, what force parallel to the ramp is needed to hold it in place?

  1. 173 lb
  2. 300 lb
  3. 260 lb
  4. 150 lb Correct answer.

Explanation

The force required to hold a load on a frictionless incline is the component of weight parallel to the ramp: F = W × sin(θ) = 300 lb × sin(30°) = 300 × 0.5 = 150 lb.

Question 38Mechanical Reasoning

A compound gear train has a driver gear with 20 teeth turning at 600 rpm, meshing with a 40-tooth gear. The 40-tooth gear shares a shaft with a 10-tooth gear, which meshes with a 50-tooth output gear. What is the speed of the output gear?

  1. 240 rpm
  2. 120 rpm
  3. 60 rpm Correct answer.
  4. 30 rpm

Explanation

The overall gear ratio is the product of the driven teeth divided by the product of the driving teeth: (40 × 50) / (20 × 10) = 2000 / 200 = 10. The output speed is the input speed divided by the ratio: 600 rpm / 10 = 60 rpm.

Question 39Mechanical Reasoning

A 200 lb load is lifted with a lever whose effort arm is 6 feet and load arm is 2 feet. If friction wastes 25 percent of the applied effort, what effort must be applied?

  1. 66.7 lb
  2. 33.3 lb
  3. 88.9 lb Correct answer.
  4. 100 lb

Explanation

The ideal mechanical advantage is 6 ft / 2 ft = 3. The ideal effort is 200 lb / 3 ≈ 66.7 lb. With 25 percent waste, only 75 percent of the applied effort is effective, so the actual effort required is 66.7 lb / 0.75 ≈ 88.9 lb.

Question 40Mechanical Reasoning

A hydraulic lift uses a small input piston with an area of 2 square inches and a large output piston with an area of 10 square inches. If a force of 50 lb is applied to the small piston, what force is produced at the large piston, assuming the system is ideal?

  1. 500 lb
  2. 250 lb Correct answer.
  3. 10 lb
  4. 100 lb

Explanation

In a hydraulic system, pressure is transmitted equally throughout the fluid, so pressure equals force divided by area. The input pressure is 50 lb / 2 in² = 25 psi, and this same pressure acting on the 10 in² piston produces 25 psi × 10 in² = 250 lb. The force is multiplied by the ratio of the areas.

Question 41Human Relations

A firefighter consistently arrives on time, completes assigned station duties, and follows through on tasks without being reminded. Which human-relations quality is being demonstrated?

  1. Adaptability
  2. Reliability Correct answer.
  3. Empathy
  4. Assertiveness

Explanation

Reliability is the pattern of dependable, consistent behavior that coworkers and supervisors can count on without prompting. It is shown through follow-through and punctuality rather than through persuasion or emotional sensitivity.

Question 42Human Relations

During a shift, a firefighter notices a coworker seems withdrawn after a difficult call. What is the most appropriate first step?

  1. Ignore it because off-duty feelings are not work-related
  2. Report the coworker to the chief immediately
  3. Tell other crew members to watch the coworker
  4. Privately ask the coworker how they are doing and listen Correct answer.

Explanation

Peer support begins with a private, respectful check-in that gives the person a chance to talk. Listening without judgment builds trust and helps identify whether further resources are needed.

Question 43Human Relations

Which behavior best demonstrates respect for a coworker's perspective during a disagreement?

  1. Interrupting to correct errors quickly
  2. Ending the conversation until the coworker agrees
  3. Raising your voice to be heard
  4. Restating the coworker's point before responding Correct answer.

Explanation

Restating another person's point shows active listening and confirms understanding before responding. This reduces defensiveness and keeps the disagreement focused on the issue.

Question 44Human Relations

A new firefighter is being teased by senior crew members in a way that feels demeaning. What is the most appropriate response under human-relations principles?

  1. Tease back more harshly to establish standing
  2. Complain to outsiders about the crew
  3. Calmly tell the crew the comments are unwelcome Correct answer.
  4. Say nothing and hope it stops

Explanation

Direct, calm communication that sets a boundary is the professional first step in addressing unwelcome behavior. It gives coworkers a clear chance to correct the conduct without escalation.

Question 45Human Relations

Which statement best describes the role of empathy in a fire crew?

  1. It means understanding others' feelings to work effectively together Correct answer.
  2. It means agreeing with every coworker's opinion
  3. It means prioritizing feelings over safety procedures
  4. It means avoiding all conflict on the crew

Explanation

Empathy is the ability to recognize and understand another person's feelings, which supports teamwork and communication. It does not require agreement, avoidance of conflict, or compromising safety.

Question 46Human Relations

Two firefighters disagree about how to complete a station task. The disagreement is escalating. What is the best approach?

  1. Let the more senior firefighter decide without discussion
  2. Postpone the task indefinitely
  3. Focus on the task and find a workable compromise Correct answer.
  4. Ask a supervisor to reassign one of them

Explanation

Keeping the focus on the task and seeking a workable compromise resolves disagreements without personal attacks. It preserves working relationships and gets the job done.

Question 47Human Relations

Which action best demonstrates teamwork during a multi-company drill?

  1. Waiting for someone else to give directions
  2. Critiquing other companies loudly during the drill
  3. Completing only your assigned portion and leaving
  4. Communicating your status and offering help where needed Correct answer.

Explanation

Teamwork involves clear communication and willingness to assist others toward the shared objective. It is cooperative rather than passive or critical.

Question 48Human Relations

A firefighter who receives constructive feedback should respond by:

  1. Sharing the feedback with peers to get support
  2. Ignoring it if it seems unfair
  3. Defending each point immediately
  4. Thanking the supervisor and asking clarifying questions Correct answer.

Explanation

Receiving feedback professionally means listening, seeking clarification, and considering how to improve. Defensiveness or ignoring feedback blocks growth.

Question 49Human Relations

A crew member repeatedly arrives late for shift, forcing others to cover duties. What is the most appropriate supervisory response?

  1. Reduce the crew member's duties permanently
  2. Announce the problem to the whole crew
  3. Ignore it to avoid conflict
  4. Address the pattern privately and document expectations Correct answer.

Explanation

Addressing a performance issue privately and clearly documenting expectations is fair and professional. It targets the behavior without publicly humiliating the employee.

Question 50Human Relations

Which statement best describes the concept of a chain of command in human relations terms?

  1. It provides a clear path for reporting and accountability Correct answer.
  2. It exists to discourage questions from subordinates
  3. It eliminates the need for peer communication
  4. It means only officers may speak during emergencies

Explanation

A chain of command clarifies who reports to whom, supporting accountability and orderly communication. It does not forbid questions or peer communication.