Capacitor Questions and Answers

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Showing 10 of 48 questions
Q21
What is the voltage across a capacitor after being charged from a 100 V source for a period of one time constant?
  • A 37.8 V
  • B 38 V
  • C 63 V
  • D 101 V
Answer: Option C
Q22
Power stored from the source and then returned to the source is called:
  • A apparent power
  • B impedance power
  • C reactive power
  • D true power
Answer: Option C
Q23
Capacitor value markings are usually:
  • A alphanumeric
  • B color dabs
  • C standard
  • D white print
Answer: Option A
Q24
A source voltage across a capacitor will:
  • A lead the current by 90 degrees
  • B lead the current by 180 degrees
  • C lag the current by 90 degrees
  • D lag the current by 180 degrees
Answer: Option C
Q25
An 8 V power source is charging a capacitor. How many volts will be across the capacitor at the second time constant?
  • A 1 volt
  • B 3 volts
  • C 5 volts
  • D 7 volts
Answer: Option D
Q26
The material used between the plates of a capacitor is called its:
  • A insulation material
  • B dielectric material
  • C separation material
  • D plate-divider material
Answer: Option B
Q27
When a circuit consists of a capacitor and a resistor in series with a voltage source, and the voltage across the resistor is zero, then the capacitor is:
  • A charging
  • B discharging
  • C fully charged
  • D fully discharged
Answer: Option C
Q28
Which material has the highest dielectric strength?
  • A Air
  • B Paper
  • C Mica
  • D Oil
Answer: Option C
Q29
In an ac circuit, a capacitor and an output resistor are connected in series with an ac signal. What filter action will be the result?
  • A bandpass
  • B low-pass
  • C high-pass
  • D band-stop
Answer: Option C
Q30
A practical capacitor
  • A is a short to dc
  • B looks like a capacitor in parallel with a resistor
  • C is an open to ac
  • D stores energy in a magnetic field
Answer: Option B

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