EIAT and NEIEP Test EIAT Mechanical — Questions and Answers

Question 1: A gear with 40 teeth meshes with a gear with 10 teeth. If the smaller gear rotates at 200 RPM, what is the speed of the larger gear?

800 RPM
50 RPM (Correct answer)
100 RPM
400 RPM

Correct answer: 50 RPM

Gear ratio = 10/40 = 1/4, so the larger gear turns at 200 × (10/40) = 50 RPM.

Question 2: Which type of pulley system provides a mechanical advantage of 3?

A single fixed pulley
Three fixed pulleys in line
A block and tackle with 3 rope segments supporting the load (Correct answer)
A single movable pulley with 3 ropes attached

Correct answer: A block and tackle with 3 rope segments supporting the load

Mechanical advantage in a block-and-tackle equals the number of rope segments supporting the moving block.

Question 3: A wrench applies 50 lb of force at 12 inches from the bolt center. What is the torque applied?

600 lb-in (Correct answer)
62 lb-in
4.17 lb-in
50 lb-in

Correct answer: 600 lb-in

Torque = Force × Distance = 50 lb × 12 in = 600 lb-in.

Question 4: An inclined plane is 10 feet long and rises 2 feet. A 500 lb crate is pushed up the ramp. Approximately how much force is required (ignoring friction)?

250 lb
100 lb (Correct answer)
500 lb
50 lb

Correct answer: 100 lb

Mechanical advantage = length/height = 10/2 = 5, so force = 500/5 = 100 lb.

Question 5: Two gears rotate in the same direction when:

They mesh directly with each other
An odd number of gears links them in a gear train
An even number of gears links them in a gear train (Correct answer)
Their diameters are equal

Correct answer: An even number of gears links them in a gear train

Each meshing pair reverses direction; an even number of intermediate gears results in the output rotating the same direction as the input.

Question 6: Which simple machine is essentially a circular lever?

Pulley
Inclined plane
Wheel and axle (Correct answer)
Wedge

Correct answer: Wheel and axle

A wheel and axle works like a lever rotating around a central fulcrum (the axle).

Question 7: A hydraulic jack has an input piston area of 2 sq in and an output piston area of 20 sq in. A force of 50 lb on the input produces how much output force?

5 lb
100 lb
500 lb (Correct answer)
1,000 lb

Correct answer: 500 lb

Pascal's Law: output force = input force × (output area / input area) = 50 × (20/2) = 500 lb.

Question 8: A compound gear train has a first pair with a 2:1 ratio and a second pair with a 4:1 ratio. What is the overall ratio?

2:1
6:1
8:1 (Correct answer)
4:1

Correct answer: 8:1

In a compound gear train, multiply the individual ratios: 2 × 4 = 8:1 overall.

Question 9: Which material property describes a material's ability to return to its original shape after a load is removed?

Plasticity
Ductility
Elasticity (Correct answer)
Malleability

Correct answer: Elasticity

Elasticity is the ability of a material to recover its original shape and size after deforming stress is removed.

Question 10: A centrifugal pump impeller spins faster. What happens to the fluid pressure it produces?

Pressure decreases
Pressure stays the same
Pressure increases (Correct answer)
Pressure becomes zero

Correct answer: Pressure increases

Higher impeller speed imparts more kinetic energy to the fluid, which converts to greater pressure at the pump outlet.

Question 11: When two shafts must transmit power at a slight angle to each other, which coupling is used?

Rigid coupling
Sleeve coupling
Universal joint (U-joint) (Correct answer)
Flange coupling

Correct answer: Universal joint (U-joint)

A universal joint allows power transmission between shafts that are not perfectly aligned or are at an angle to each other.

Question 12: A container holds oil (density 0.8) and water (density 1.0). Where does the oil settle?

At the bottom
Evenly mixed throughout
At the top (Correct answer)
In the middle

Correct answer: At the top

Fluids with lower density float on fluids with higher density, so oil settles above water.

Question 13: A beam is supported at both ends with a load placed at the center. Where is the bending stress greatest?

At the supports
At the center of the beam (Correct answer)
At the top surface of the beam at the quarter-points
Equally distributed throughout

Correct answer: At the center of the beam

For a simply supported beam with a center point load, maximum bending moment — and therefore maximum bending stress — occurs at the midpoint.

Question 14: Which valve type provides the most gradual and precise flow control in a piping system?

Gate valve
Ball valve
Globe valve (Correct answer)
Check valve

Correct answer: Globe valve

Globe valves have a plug that moves perpendicular to flow, allowing fine incremental adjustment of flow rate.

Question 15: A V-belt drive slips when the load is too high. What is the most effective solution?

Increase belt tension or install a wider/higher-capacity belt (Correct answer)
Lubricate the belt with oil
Reduce the driven pulley diameter
Increase the rotational speed of the motor

Correct answer: Increase belt tension or install a wider/higher-capacity belt

Slipping means the belt cannot transmit the required torque; increasing tension or using a higher-capacity belt restores grip.

Question 16: Two pistons in a hydraulic system: piston A has an area of 5 sq in and piston B has an area of 25 sq in. If piston A moves 10 inches, how far does piston B move?

50 inches
2 inches (Correct answer)
10 inches
25 inches

Correct answer: 2 inches

Volume is conserved: A_A × d_A = A_B × d_B → 5×10 = 25×d_B → d_B = 2 inches.

Question 17: What does a torque wrench measure?

The speed of fastener rotation
The rotational force applied to a fastener (Correct answer)
The hardness of the bolt material
The thread pitch of a fastener

Correct answer: The rotational force applied to a fastener

A torque wrench measures and limits the rotational force (torque) applied when tightening fasteners to a specified value.

Question 18: In a pulley system, if you pull the rope 6 feet to raise a load 2 feet, what is the mechanical advantage?

3 (Correct answer)
2
6
12

Correct answer: 3

Mechanical advantage = distance effort moves / distance load moves = 6 ft / 2 ft = 3.

Question 19: A shaft rotates clockwise when viewed from one end. When viewed from the opposite end, it rotates:

Clockwise
Counterclockwise (Correct answer)
Either direction depending on speed
It stops

Correct answer: Counterclockwise

The rotation direction reverses when you view a shaft from the opposite end, just as a clock face appears to run backwards from behind.

Question 20: Which bearing type is best suited for handling large axial (thrust) loads in one direction?

Deep groove ball bearing
Needle roller bearing
Tapered roller bearing (Correct answer)
Cylindrical roller bearing

Correct answer: Tapered roller bearing

Tapered roller bearings are designed to handle combined radial and axial loads, making them ideal for high thrust applications.

Question 21: A motor drives a pump through a flexible coupling that fails. What is the most likely cause?

Excessive belt tension
Shaft misalignment between the motor and pump (Correct answer)
Too low a rotational speed
Insufficient lubrication on the coupling bolts

Correct answer: Shaft misalignment between the motor and pump

Flexible couplings fail prematurely when shafts are misaligned; misalignment creates cyclic stress that fatigues the coupling element.

EIAT and NEIEP Test EIAT Mechanical

A gear with 40 teeth meshes with a gear with 10 teeth.
If the smaller gear rotates at 200 RPM, what is the speed of the larger gear?

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