单项选择题Electric circuits are protected against overloads and short circuits by means of a/an ().

A.circuit breaker
B.amplifier
C.diode
D.capacitor


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1.单项选择题Ambient temperature is the ().

A.amount of temperature rise with no load
B.temperature of the compartment where the motor is located
C.normal operating temperature, less the room temperature
D.amount of temperature developed by an operating motor

2.单项选择题You are attempting to parallel two AC generators and the synchroscope pointer is revolving in the slow directionThis indicates that the frequency of the incoming machine is ().

A.higher than the bus frequency
B.lower than the bus freouencv
C.the same as the bus frequency but out of phase with it
D.the same as the bus frequency, and the circuit breaker may be closed at any pointer position

3.单项选择题The need for insulation cleaning may be determined by ()

A.visual inspection for dirt accumulation
B.high megger readings
C.low operating temperature
D.the time period since the last cleaning

4.单项选择题Voltage will always lead current in a/an ()

A.capacitive circuit
B.inductive circuit
C.magnetic circuit
D.resistive circuit

5.单项选择题The number of cycles per second occurring in AC voltage is known as the ()

A.phase angle
B.frequency
C.wave form
D.half mode

6.单项选择题Complete maintenance of electrical motors should include periodic checks for machine ()

A.vibration
B.watertight integrity
C.speed droop
D.reactive power

7.单项选择题The frequency of an alternator is controlled from the main switchboard by adjusting the()

A.frequency meter
B.voltage regulator
C.governor control
D.sychroscope switch

8.单项选择题The frequency of an AC generator is controlled by the ()

A.rheostat
B.governor
C.exciter
D.capacitor

9.单项选择题Capacitance is the property of an electric circuit opposing a change in the ()

A.current in the circuit
B.voltage in the circuit
C.inductance in the circuit
D.resistance in the circuit

10.单项选择题Inductance is the property of an electric circuit that ()

A.opposes any change in the applied voltage
B.opposes any change in the current flow through the circuit
C.aids any changes in the applied voltage
D.aids any changes in the current through the circuit