After determining that a high pressure switch is open, the next step is to:
A) Check the system high side pressure.
B) Determine why there is a high pressure condition.
C) Determine whether or not the pressure switch should be open.
D) All of the above.
D
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Which of the following is true of shaded-pole motors?
a. They are small, inexpensive, and powerful. b. They have a low starting torque, a low efficiency, and a high noise level. c. They have a lower line current, are higher efficiency, and are very quiet. d. They have a larger current, a lower total impedance, and a higher reacta
Which part of Europe was invaded first by British and American forces?
a. Italy b. Yugoslavia c. France d. Norway
To check the condition of the compressor's motor windings, a technician will need to measure the resistance of the windings using a standard:
A) Voltmeter. B) Ohmmeter. C) Ammeter. D) Multimeter.
An inductive load that has a resistive component of 4 ? is connected to an ac source of 120 V (rms) through a half-wave SCR circuit. When the triggering angle of the SCR is 50o , the conduction period is 160o . Calculate the following:
a. Average voltage across the load b. Average voltage across the resistive element of the load c. rms voltage across the load d. Average current of the load e. If a freewheeling diode is connected across the load, calculate the load rms voltage. Assume that the current of the diode flows for a complete half cycle.