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Multiple Choice Quiz
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1
When the load on an ac source contains only resistance, the current and voltage are in phase.
A)True
B)False
2
Reluctance is the name given to the opposition to current caused by capacitors and inductors.
A)True
B)False
3
A phasor is a line whose direction represents the phase angle and length represents the magnitude of an electrical quantity.
A)True
B)False
4
The Greek letter lambda is used to indicate the angle that will be used to analyze a right triangle.
A)True
B)False
5
In a resistive-capacitive ac circuit, power is equal to current times voltage.
A)True
B)False
6
True power in an ac circuit that contains resistors and inductors can be calculated by
A)current times voltage
B)current times resistance
C)current times inductive reactance
D)current times voltage times cosine theta
7
In an ac circuit containing both resistance and reactance, the product of the voltage and current regardless of the phase angle theta is
A)true power
B)apparent power
C)power in watts
D)power in joules
8
The power factor of a circuit can be any value between
A)0 and 1
B)0 and 10
C)1 and 5
D)1 and 9
9
Which of the following are resistive loads?
A)electric heater
B)clothes iron
C)stove
D)any of the above answers are correct
10
What instrument is used to measure true power?
A)voltmeter
B)ammeter
C)wattmeter
D)oscilloscope





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