POSTAL AUTOMOTIVE TECHNICIAN
2025/2026 EXAM 944 QUESTION AND
ANSWER
1. The vibration damper on an auto engine is fastened to the ...... ANSWER
...... Crankshaft
2. Most small gas engines use a ______ ignition system ...... ANSWER
...... Magneto
3. Icing occurs most often ...... ANSWER ...... On cool damp days
4. The function of the float in a carburetor is to ...... ANSWER ...... Close the
needle valve
5. The component that converts reciprocating piston motion into rotational
motion is the ...... ANSWER ...... Crankshaft
6. The spark plug fires just before the piston reaches ______ top dead center
...... ANSWER ...... Compression
7. The three basic types of engine bearings are main, connecting rod, and ......
ANSWER ...... Camshaft bearings
8. A bluish-white smoke from the exhaust indicates ...... ANSWER ...... Oil
burning past piston rings or valve seals
9. The purpose of the PCV (positive crankcase ventilation) system is to ......
ANSWER ...... Remove blow-by gases and reduce emissions
10.The two main types of cooling systems are air-cooled and ...... ANSWER
...... Liquid-cooled
11.A thermostat stuck in the open position will cause the engine to ......
ANSWER ...... Run cold and heat up slowly
, 12.The recommended coolant mixture for most postal vehicles is ......
ANSWER ...... 50% antifreeze / 50% distilled water
13.The primary filter for engine oil is called the ...... ANSWER ...... Oil filter
(full-flow filter)
14.The sensor that tells the PCM the position of the accelerator pedal is the ......
ANSWER ...... Throttle position sensor (TPS)
15.A lean air-fuel mixture (too much air) can cause ...... ANSWER
...... Backfiring or popping through the intake
16.The device that maintains fuel pressure at the injectors is the ...... ANSWER
...... Fuel pressure regulator
17.On a distributor ignition system, the part that opens and closes the primary
circuit is the ...... ANSWER ...... Ignition points (or pickup coil)
18.The three main parts of a starting system are the battery, starter solenoid, and
...... ANSWER ...... Starter motor
19.The alternator produces ______ current, which is then converted to DC ......
ANSWER ...... Alternating current (AC)
20.A parasitic draw test measures ...... ANSWER ...... Current drain with the
ignition off
21.The two types of brake friction materials most common are organic and ......
ANSWER ...... Semi-metallic or ceramic
22.The master cylinder reservoir should be filled with ...... ANSWER ...... DOT
3, DOT 4, or DOT 5.1 brake fluid (as specified)
23.A spongy brake pedal is usually caused by ...... ANSWER ...... Air in the
hydraulic system
24.The parking brake typically operates the ...... ANSWER ...... Rear brakes
only
25.The power steering fluid level should be checked with the engine ......
ANSWER ...... Running at idle
2025/2026 EXAM 944 QUESTION AND
ANSWER
1. The vibration damper on an auto engine is fastened to the ...... ANSWER
...... Crankshaft
2. Most small gas engines use a ______ ignition system ...... ANSWER
...... Magneto
3. Icing occurs most often ...... ANSWER ...... On cool damp days
4. The function of the float in a carburetor is to ...... ANSWER ...... Close the
needle valve
5. The component that converts reciprocating piston motion into rotational
motion is the ...... ANSWER ...... Crankshaft
6. The spark plug fires just before the piston reaches ______ top dead center
...... ANSWER ...... Compression
7. The three basic types of engine bearings are main, connecting rod, and ......
ANSWER ...... Camshaft bearings
8. A bluish-white smoke from the exhaust indicates ...... ANSWER ...... Oil
burning past piston rings or valve seals
9. The purpose of the PCV (positive crankcase ventilation) system is to ......
ANSWER ...... Remove blow-by gases and reduce emissions
10.The two main types of cooling systems are air-cooled and ...... ANSWER
...... Liquid-cooled
11.A thermostat stuck in the open position will cause the engine to ......
ANSWER ...... Run cold and heat up slowly
, 12.The recommended coolant mixture for most postal vehicles is ......
ANSWER ...... 50% antifreeze / 50% distilled water
13.The primary filter for engine oil is called the ...... ANSWER ...... Oil filter
(full-flow filter)
14.The sensor that tells the PCM the position of the accelerator pedal is the ......
ANSWER ...... Throttle position sensor (TPS)
15.A lean air-fuel mixture (too much air) can cause ...... ANSWER
...... Backfiring or popping through the intake
16.The device that maintains fuel pressure at the injectors is the ...... ANSWER
...... Fuel pressure regulator
17.On a distributor ignition system, the part that opens and closes the primary
circuit is the ...... ANSWER ...... Ignition points (or pickup coil)
18.The three main parts of a starting system are the battery, starter solenoid, and
...... ANSWER ...... Starter motor
19.The alternator produces ______ current, which is then converted to DC ......
ANSWER ...... Alternating current (AC)
20.A parasitic draw test measures ...... ANSWER ...... Current drain with the
ignition off
21.The two types of brake friction materials most common are organic and ......
ANSWER ...... Semi-metallic or ceramic
22.The master cylinder reservoir should be filled with ...... ANSWER ...... DOT
3, DOT 4, or DOT 5.1 brake fluid (as specified)
23.A spongy brake pedal is usually caused by ...... ANSWER ...... Air in the
hydraulic system
24.The parking brake typically operates the ...... ANSWER ...... Rear brakes
only
25.The power steering fluid level should be checked with the engine ......
ANSWER ...... Running at idle
