Liquid lines need to be insulated:
A) They are run close enough to the hot suction line to pick up heat from it.
B) If they travel through an unusually hot space.
C) Always.
D) For systems using HFC refrigerants.
B
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Plugging is used with direct current motors more than with three phase squirrel cage motors.
Answer the following statement true (T) or false (F)
Briefly distinguish between a head called a stock replacement and a bolt-on head.
What will be an ideal response?
The subsequent problems deal with the circuit below where all voltage sources are dc and the circuit is assumed to be in steady state. Also, R1 = R2 = R3 = R4 = R.
If the voltage across R3 is 1V, then the voltage across R1 is
A. V1 B. V1 ? 1 V C. V1 + 1 V D. V1 + 2 V E. V1 ? 2 V
The advantage of a phototransistor over a photodiode detector is that __________.
A. it operates at higher frequencies B. it has greater light sensitivity C. it is linear D. it has small temperature coefficients