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If a box is to contain four No. 10 conductors and two No. 12 conductors, what is the minimum sized box that can be used in cubic inches?
14 ½
Which of the following is reduced by using silicon steel material for core of the transformers:
Hysteresis loss
When more starting torque is needed, a start _____ is added to the motor:
Capacitor
When using an ammeter or voltmeter in a circuit, the circuit must be:
energized
Which of the following materials are used in making resistors:
Insulators
The phenomenon in which the a.c. current flowing on the surface of the conductor is:
skin effect
______ create an alternating frequency that can be varied
Inverters
A centrifugal switch is used to take out the starting winding out of the circuit once the motor reaches ____ of its rated speed:
75%
Compressors used in refrigeration applications normally requires motors with _____ starting torque:
High
Which of the following insulation class has highest permissible temperature withstand value:
Class H
______ are caused by the reluctance of the iron core to change polarity with changes in current direction and resultant changes in magnetic field polarity:
Service factor is actually reserve horsepower for the motor:
True
Which of the following is a self starting motor:
3-phase induction motor
Which of the following is not a type of service disconnect?
Bus Bar
The total load on any single overcurrent device in a panelboard must not exceed 80 percent of its capacity where the load continues for 3 or more hours to avoid overheating of the conductor.
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