What functions are performed by piston rings?
A. Sealing only.
B. Pressurizing only.
C. Lubrication only.
D. Sealing, lubrication and cooling.
Answer: D
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What is the most accurate method of plug stopping a motor?
What will be an ideal response?
Technician A says that when a compression fitting with a copper washer has been tightened, the hose can no longer rotate. Technician B says that the compression fitting must be installed before the other end of the hose is installed. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
How does the rotor of an AC induction motor receive current?
A) The rotor is precharged at the factory. B) The rotor is powered by internal batteries. C) Rotor current is induced by the rotor magnetic field. D) Rotor current passes through brushes to the rotor.
What function do facility batteries provide during normal operating conditions (commercial alternate current [AC] power available)?
a. They generate direct current (DC) power and run the switch. b. They act as a DC filter for the commercial AC power. c. They rectify the commercial AC to DC and power the system. d. They serve no function unless commercial power is disconnected.