In the above figure, the function of the SCRs is to __________.
A. provide rectification for the armature
B. control the amount of current flow through the armature
C. both a and b
D. control the amount of current flow through the armature and the field coils
Answer: C
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PLCs are designed to be programmed with ____.
A. ladder diagrams B. BASIC C. higher-order languages D. relays
Reactive power is always _____.
a. equal to true power b. 90° out of phase with true power c. measured in ohms d. responsible for performing most of the work in a circuit 17. If the time for one cycle is 0.1 second, the frequency is _____.
Most heat pumps have two metering devices because:
A) Each coil must function as the evaporator during one of the cycles. B) Two metering devices allow for extra refrigerant flow at low outdoor temperatures. C) Two metering devices allow two stage operation. D) One metering device serves as a backup to the primary metering device.
When nervous, ratites will jump, flail their wings, and _____.
Fill in the blank(s) with the appropriate word(s).