EIAT and NEIEP Test EIAT Mechanical 5 — Questions and Answers
Question 1: 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 2: 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 3: 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 4: 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 5: 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 6: 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 7: 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 5
A V-belt drive slips when the load is too high.
What is the most effective solution?