Answer the following statement(s) true (T) or false (F)
1. A commercial air-conditioning unit contains the same devices as a residential system.
2. In a commercial-air-conditioning unit, the compressor may be operated by a three-phase squirrel-cage induction motor.
3. In a typical schematic diagram for a commercial air-conditioning unit, C stands for Cooling Compensator.
4. In a typical schematic diagram for a commercial air-conditioning unit, QT stands for Quad Terminal.
5. In a commercial air-conditioning unit, the crankcase heater is energized at all times.
1. FALSE
2. TRUE
3. FALSE
4. TRUE
5. TRUE
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A) More than three B) One C) Two or three D) A vacuum
The hysteresis loss in a transformer is ________
A) caused by the resistance of the wire B) another name for flux leakage loss C) caused by current flowing in the core D) caused by rapid reversal of the magnetic field
The power curve is a(n) ________ with twice the frequency of the current or voltage
A. horizontal axis B. sinusoid C. inductive network D. ideal capacitor
Spreading can be minimized by _____
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