Chapter 16 - Alternating Current - 4

Chapter 16 - Alternating Current - 4

1. The magnitude of r.m.s value of voltage can be expressed as:

a) Vrms=Vo+Vo
b) Vrms=Vo2+Vo2/2
c) All of the above
d) Vrms=Vo/ √2

2. An AC voltmeter reads 220v its peak value is:

a) 250V
b) 350V
c) 220V
d) 311.12V

3. In AC circuits current and voltage is controlled by a:

a) Resistor ‘R’
b) All of the above
c) Inductor ‘L’
d) Capacitor ‘C’

4. The flow of DC current may be opposed by:

a) Resistor ‘R’
b) Inductor ‘L’
c) All of the above
d) Capacitor ‘C’

5. A device that allows only the continuous flow of AC through a circuit is:

a) None of the above
b) Inductor
c) DC motor
d) Capacitor

6. An Ac continuously flows through the plates of a capacitor because of:

a) Dielectric present between the plates
b) Charging and discharging both
c) Charging of plates
d) Discharging of plates

7. The opposition offered by a capacitor to the flow of an AC is called:

a) Reactance R
b) None
c) Capacitance
d) Inductance L

8. The reactance of magnitude of Xc of a capacitor joined across a alternating source can be found by a relation:

a) X= √Vrms
b) Xc=Vrms + Irms
c) Xc=Vrms
d) Xc=Irms

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