Basic Electrical Engineering Questions and Answers – Current and Voltage in a Capacitive Circuit

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This set of Basic Electrical Engineering Assessment Questions and Answers focuses on “Current and Voltage in a Capacitive Circuit”.

1. Can capacitor fully charge using alternating current?
a) yes
b) no
c) may or may not
d) depend on value of capacitance
View Answer

Answer: a
Explanation: No, the capacitor cannot be fully charged using alternating current because as soon as the capacitor charges, the alternating current reverses its polarity thereby discharging it.
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2. What is the resistance offered by a capacitor?
a) Susceptance
b) Conductance
c) Admittance
d) Reactance
View Answer

Answer: d
Explanation: Resistance offered to alternating current by inductor or capacitor is known as reactance which is equivalent to resistance of resistor.

3. The combination of resistance and reactance known as ___________
a) Susceptance
b) Impedance
c) Conductance
d) Admittance
View Answer

Answer: b
Explanation: The combination of resistance and reactance is known as impedance. It is equivalent resistance of an RLC alternating circuit.
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4. What is the relation between reactance, resistance and impedance?
a) Z=R+jX
b) Z=R+X
c) Z=R-X
d) Z=R-jX
View Answer

Answer: a
Explanation: The combination of resistance and reactance is known as impedance. Z=R+jX
Where Z is impedance, R is resistance and X is reactance.

5. What is the real part of the impedance of RLC circuit?
a) Resistance
b) Conductance
c) Admittance
d) Reactance
View Answer

Answer: a
Explanation: The combination of resistance and reactance is known as impedance. Z=R+jX where Z is impedance, R is resistance and X is reactance. R is real part of Z.
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6. What is imaginary part of the impedance of RLC circuit?
a) Resistance
b) Conductance
c) Admittance
d) Reactance
View Answer

Answer: d
Explanation: The combination of resistance and reactance is known as impedance. Z=R+jX where Z is impedance, R is resistance and X is reactance. X is imaginary part of Z.

7. Which type of current can be stored in a capacitor?
a) Alternating current
b) Direct current
c) Both alternating current and direct current
d) Neither alternating current nor direct current
View Answer

Answer: b
Explanation: Only direct current can be stored in the capacitor. Capacitor cannot be fully charged using alternating current because as soon as the capacitor charges, alternating current reverses its polarity thereby discharging it. So, we cannot store ac current in capacitor.
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Sanfoundry Global Education & Learning Series – Basic Electrical Engineering.

To practice all areas of Basic Electrical Engineering Assessment Questions, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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