Technician A says that CJ-4 diesel engine lubricating oil is backward compatible with all previous diesel engine lube oil classifications. Technician B says that the digit 4, in CJ-4 means that the oil is suitable for 4-stroke cycle use. Who is right?

A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B


Answer: C

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In the engine condition known as ____, the air–fuel mixture fails to burn smoothly.

a. exhaust b. detonation c. implosion d. intake

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When rebuilding a diesel engine water pump, which of the following components has to be handled with a great amount of care?

A. steel impellers B. plastic impellers C. drive pulley D. ceramic seal

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What are some factors that must be considered when designing a refrigerated warehouse?

What will be an ideal response?

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Answer the following statement(s) true (T) or false (F)

1. The single-phase motors used in air conditioning systems are generally one of three types. 2. A rotating magnetic field can be produced with two separate phases. 3. The contacts of the centrifugal switch are connected in parallel with the start winding. 4. Capacitor-start induction-run motors are very similar to resistance-start induction-run motors. 5. Some dual-voltage motors will contain two start windings as well as two run windings.

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