,INDUSTRIAL MAINTENANCE TECHNICIAN TEST EXAM
COMPREHENSIVE PRACTICE QUESTION BANK (200 QUESTIONS)
1. A gearbox has an input speed of 1,800 RPM and an output speed of 360 RPM.
What is the gear ratio and its classification?
A) 0.2:1 (Speed increase)
B) 1:5 (Speed increase)
C) 5:1 (Speed reduction)
D) 36:1 (Speed reduction)
Correct Answer: C) 5:1 (Speed reduction)
Rationale: The gear ratio is calculated by dividing the input speed by the output speed
(1, = 5). A ratio greater than 1:1 indicates a speed reduction, which concurrently
multiplies the output torque by a factor of 5.
2. Which type of bearing is specifically engineered to handle significant combined
radial and thrust (axial) loads simultaneously?
A) Deep groove ball bearing
B) Cylindrical roller bearing
C) Tapered roller bearing
D) Needle roller bearing
Correct Answer: C) Tapered roller bearing
Rationale: Tapered roller bearings have conical rollers and raceways designed to
withstand heavy combined loads. They are the preferred choice for high-thrust and high-
radial applications such as automotive wheel hubs and heavy industrial gearboxes.
3. During a shaft alignment procedure on a direct-coupled motor and pump, what
is the generally accepted parallel offset tolerance for standard flexible couplings?
A) ±0.002 inches (0.05 mm)
,B) ±0.010 inches (0.25 mm)
C) ±0.050 inches (1.27 mm)
D) ±0.100 inches (2.54 mm)
Correct Answer: A) ±0.002 inches (0.05 mm)
Rationale: Precision alignment is critical to prevent premature bearing, seal, and coupling
failure. For standard rotating equipment operating at 3,600 RPM or less, the typical
parallel offset tolerance is held to within 0.002 inches.
4. What is the primary purpose of a relief valve in a hydraulic system?
A) To regulate the flow rate to the actuator
B) To limit the maximum system pressure
C) To filter contamination from the fluid
D) To direct fluid to the tank when the pump is off
Correct Answer: B) To limit the maximum system pressure
Rationale: The relief valve is a normally closed pressure-control device that opens when
system pressure exceeds a preset limit, diverting flow back to the reservoir to protect
components from over-pressurization.
5. Cavitation in a hydraulic pump is most often caused by which condition?
A) High oil viscosity
B) Contaminated oil
C) Low net positive suction head (NPSH)
D) Excessive discharge pressure
Correct Answer: C) Low net positive suction head (NPSH)
Rationale: Cavitation occurs when the absolute pressure at the pump inlet falls below the
vapor pressure of the hydraulic fluid. This causes vapor bubbles to form and violently
collapse, leading to pitting, noise, and pump failure.
, 6. An overload relay is designed to protect an electric motor primarily from which
condition?
A) Short circuits
B) Ground faults
C) Sustained overcurrent due to mechanical overload
D) Voltage spikes
Correct Answer: C) Sustained overcurrent due to mechanical overload
Rationale: Overload relays are thermal devices that mimic the heating characteristics of a
motor. They trip after a time delay to allow temporary starting currents but protect
against prolonged overcurrent conditions that would overheat the windings.
7. Which type of fire extinguisher should be used on a Class B fire involving
flammable liquids like gasoline or oil?
A) Class A extinguisher
B) Class B extinguisher
C) Class C extinguisher
D) Class D extinguisher
Correct Answer: B) Class B extinguisher
Rationale: Class B fires involve flammable liquids and gases. Extinguishers rated for Class
B contain agents such as dry chemical, CO2, or foam that work by smothering the fire and
interrupting the combustion process.
8. What is the most critical first step in a Lockout/Tagout (LOTO) procedure?
A) Apply the lock and tag
B) Verify that the equipment is de-energized
C) Notify affected employees
D) Shut down the equipment using normal stopping procedures
Correct Answer: D) Shut down the equipment using normal stopping procedures
Rationale: The procedural sequence is strictly defined by OSHA. The technician must first
properly shut down the equipment using its normal controls before isolating energy
sources and applying locks and tags. Verification is the final step before work begins.
COMPREHENSIVE PRACTICE QUESTION BANK (200 QUESTIONS)
1. A gearbox has an input speed of 1,800 RPM and an output speed of 360 RPM.
What is the gear ratio and its classification?
A) 0.2:1 (Speed increase)
B) 1:5 (Speed increase)
C) 5:1 (Speed reduction)
D) 36:1 (Speed reduction)
Correct Answer: C) 5:1 (Speed reduction)
Rationale: The gear ratio is calculated by dividing the input speed by the output speed
(1, = 5). A ratio greater than 1:1 indicates a speed reduction, which concurrently
multiplies the output torque by a factor of 5.
2. Which type of bearing is specifically engineered to handle significant combined
radial and thrust (axial) loads simultaneously?
A) Deep groove ball bearing
B) Cylindrical roller bearing
C) Tapered roller bearing
D) Needle roller bearing
Correct Answer: C) Tapered roller bearing
Rationale: Tapered roller bearings have conical rollers and raceways designed to
withstand heavy combined loads. They are the preferred choice for high-thrust and high-
radial applications such as automotive wheel hubs and heavy industrial gearboxes.
3. During a shaft alignment procedure on a direct-coupled motor and pump, what
is the generally accepted parallel offset tolerance for standard flexible couplings?
A) ±0.002 inches (0.05 mm)
,B) ±0.010 inches (0.25 mm)
C) ±0.050 inches (1.27 mm)
D) ±0.100 inches (2.54 mm)
Correct Answer: A) ±0.002 inches (0.05 mm)
Rationale: Precision alignment is critical to prevent premature bearing, seal, and coupling
failure. For standard rotating equipment operating at 3,600 RPM or less, the typical
parallel offset tolerance is held to within 0.002 inches.
4. What is the primary purpose of a relief valve in a hydraulic system?
A) To regulate the flow rate to the actuator
B) To limit the maximum system pressure
C) To filter contamination from the fluid
D) To direct fluid to the tank when the pump is off
Correct Answer: B) To limit the maximum system pressure
Rationale: The relief valve is a normally closed pressure-control device that opens when
system pressure exceeds a preset limit, diverting flow back to the reservoir to protect
components from over-pressurization.
5. Cavitation in a hydraulic pump is most often caused by which condition?
A) High oil viscosity
B) Contaminated oil
C) Low net positive suction head (NPSH)
D) Excessive discharge pressure
Correct Answer: C) Low net positive suction head (NPSH)
Rationale: Cavitation occurs when the absolute pressure at the pump inlet falls below the
vapor pressure of the hydraulic fluid. This causes vapor bubbles to form and violently
collapse, leading to pitting, noise, and pump failure.
, 6. An overload relay is designed to protect an electric motor primarily from which
condition?
A) Short circuits
B) Ground faults
C) Sustained overcurrent due to mechanical overload
D) Voltage spikes
Correct Answer: C) Sustained overcurrent due to mechanical overload
Rationale: Overload relays are thermal devices that mimic the heating characteristics of a
motor. They trip after a time delay to allow temporary starting currents but protect
against prolonged overcurrent conditions that would overheat the windings.
7. Which type of fire extinguisher should be used on a Class B fire involving
flammable liquids like gasoline or oil?
A) Class A extinguisher
B) Class B extinguisher
C) Class C extinguisher
D) Class D extinguisher
Correct Answer: B) Class B extinguisher
Rationale: Class B fires involve flammable liquids and gases. Extinguishers rated for Class
B contain agents such as dry chemical, CO2, or foam that work by smothering the fire and
interrupting the combustion process.
8. What is the most critical first step in a Lockout/Tagout (LOTO) procedure?
A) Apply the lock and tag
B) Verify that the equipment is de-energized
C) Notify affected employees
D) Shut down the equipment using normal stopping procedures
Correct Answer: D) Shut down the equipment using normal stopping procedures
Rationale: The procedural sequence is strictly defined by OSHA. The technician must first
properly shut down the equipment using its normal controls before isolating energy
sources and applying locks and tags. Verification is the final step before work begins.
