MASS Test Technical Reading Comprehension Questions and Answers

Question 1

Read the following maintenance procedure: 'Procedure 4.1: Filter Replacement. CAUTION: Ensure system is depressurized before proceeding. Step 1: Place a drain pan beneath the filter housing. Step 2: Using a 24mm strap wrench, turn the housing counter-clockwise to loosen. Step 3: Remove the old filter element and O-ring. Step 4: Lubricate the new O-ring with clean system fluid before installation.' According to this procedure, what must be done immediately before installing the new O-ring?

Accepted Answer

Lubricate it with clean system fluid.

Answer

The text explicitly states in Step 4, 'Lubricate the new O-ring with clean system fluid before installation.' This is the final preparatory step before the new O-ring is physically installed.

Question 2

A technician is servicing a piece of equipment and consults the lubricant specification chart below. The equipment is a standard enclosed gearbox operating in a factory where the ambient temperature is consistently between 15°C and 35°C. Which lubricant is the most appropriate choice?

| Lubricant | ISO VG | Temp Range (°C) | Application |
|---|---|---|---|
| Hydro-L 32 | 32 | -10 to 60 | Light-duty hydraulics |
| Gear-M 220| 220| 0 to 95 | Enclosed gearboxes |
| Synth-H 68 | 68 | -20 to 120 | High-temp hydraulics |
| Chain-T 150| 150| -5 to 80 | Conveyor chains |

Accepted Answer

Gear-M 220

Answer

The application is an 'Enclosed gearbox', which matches Gear-M 220. The operating temperature (15°C to 35°C) is well within the acceptable temperature range (0 to 95°C) for Gear-M 220. The other lubricants are for different applications (hydraulics, chains).

Question 3

A technical manual describes a troubleshooting process: 'Symptom: Low Output Pressure. Possible Causes: (1) Clogged suction strainer. (2) Worn pump seals. (3) Incorrect motor rotation. (4) System relief valve set too low.' A technician has already verified that the suction strainer is clean and the motor rotates correctly. According to the manual, which of the following is a logical next item to investigate?

Accepted Answer

The system relief valve setting.

Answer

The technician has eliminated causes (1) and (3) from the manual's list. The remaining possible causes are (2) Worn pump seals and (4) System relief valve set too low. Of the answer choices provided, investigating the system relief valve setting is a direct troubleshooting step from the manual.

Question 4

A warning label on an electrical control panel reads: 'DANGER: Hazardous Voltage. Contact may cause electric shock or burn. Disconnect and lock out power source before opening or servicing. Only qualified personnel should perform work on this equipment.' Based on this label, what is the most critical action that must be performed to ensure safety before servicing?

Accepted Answer

Disconnect and lock out the power source.

Answer

While being qualified is a requirement, the label explicitly commands the primary action to prevent the hazard: 'Disconnect and lock out power source before opening or servicing.' This step de-energizes the equipment, which is the most critical action to prevent electric shock.

Question 5

In a pneumatic diagram, a symbol shows a circle with a solid, equilateral triangle inside, where the triangle points outwards from the center. What does this component symbol represent?

Accepted Answer

A pneumatic motor

Answer

According to ISO 1219 standard symbols for fluid power, a circle represents a rotary energy conversion device. A solid triangle indicates the direction of fluid flow (in this case, pneumatic). An outward-pointing triangle signifies an output device, like a motor, which converts pneumatic energy into mechanical motion. An inward-pointing triangle would represent a pump or compressor.

MASS Test Practice Test

MASS Test Practice Test

MASS Test Technical Reading Comprehension Questions and Answers