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AC, DC Circuits, Voltmeter


Quiz Questions

1. In Figure 10-131, a parallel AC circuit containing an inductance and a resistance is shown schematically. The current flowing through the inductance, IL, is 0.0584 ampere, and the current flowing through the resistance is 0.11 ampere. What is the total current in the circuit?
PDH Course - AC, DC Circuits, Voltmeter 1
0.052 ampere
0.1245 ampere
0.332 ampere
0.5 ampere
2. The following figure represents __________________.?
PDH Course - AC, DC Circuits, Voltmeter 2
Step – up transformer
Step – down transformer
3. A 220-volt AC motor takes 50 amperes from the line, but a wattmeter in the line shows that only 9,350 watts are taken by the motor. What is the power factor?
65
75
85
95
4. A _____________ changes electrical energy of a given voltage into electrical energy at a different voltage level.
Transformer
Resistor
Voltmeter
Transistor
5. Damping may be accomplished by _______________.?
Electrical means
Mechanical means
Both Electrical and Mechanical means
None of the above
6. _____________ is used to measure insulation resistance and other high resistance values.
Voltmeter
Megohmmeter
Wattmeter
7.

The _____________ is a vacuum instrument that contains an electron gun, which emits a very narrow and focused beam of electrons.
Cathode Ray Tube
Cathode Volt Tube
Light Ray Tube
None of the above
8. A Moving Iron Vane meter can be used to measure either AC or DC.
True
False
9. A transformer does not add any electricity to the circuit but merely changes or transforms the electricity that already exists in the circuit from one voltage to another, the total amount of energy in a circuit must_______________.
Increase
Decrease
Remain the same
10. ________________ is the electrical energy required to magnetize the transformer core, first in one direction and then in the other, in step with the applied alternating voltage.
Hysteresis loss
Eddy current loss
Copper loss
None of the above