Equipment markings shall include: (1) class, (2) division, (3) material classification group, (4) equipment temperature, and (5) ____.
A. maximum voltage
B. material composition
C. average draw
D. ambient temperature range
Answer: D
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Answer the following statement(s) true (T) or false (F)
1. Shunt field power supplies are never left energized when the motor is not in operation. 2. Power to an armature is generally supplied by a four-phase, full-wave bridge rectifier. 3. One method of sensing current is to insert current transformers in the three-phase power lines supplying power to the solid-state controller. 4. When a phase-shift control unit senses a voltage decrease, it increases the voltage supplied to the armature until the electro-tachometer is again producing the present output voltage. 5. Feedback control occurs when an electro-tachometer feeds a signal back to the phase-shift unit.
When a relay is de-energized, ____.
A. the contacts remain closed B. the contacts are mechanically held C. spring tension causes the contacts to open D. cooling is required before the relay can be re-energized
Which of the following feature controls must have a datum reference?
A. flatness B. straightness C. cylindricity D. parallelism
The circuit shown in Figure P3.35 is a simplified DC version of an AC three-phase wye-wye (Y-Y) electrical distribution system commonly used to supply industrial loads, particularly rotating machines.
Notice that once v’n is known the other unknown node voltages can be computed directly by voltage division.
