Electrical Engineering MCQ Questions and Answers

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Showing 10 of 37 questions
Q21
The frequency of DC current
  • A Equal to voltage magnitude
  • B 0
  • C Double of AC frequency
  • D 50 HZ
Answer: Option B
Q22
The current flowing in a purely inductive circuit of 30 mH on application of 230 V, 50 Hz single phase supply is 24.4 A. If the frequency of the applied voltage is increased to 100 Hz the current flowing in the same circuit will be
  • A 24.4 A
  • B 48.8 A
  • C 12.2 A
  • D 6.1 A
Answer: Option C
Q23
Find the total resistance when two 3 Ohm resistances are connected in parallel.
  • A 1.11 ohms
  • B 1.5 ohms
  • C 0.707 ohms
  • D 1.23 ohms
Answer: Option B
Q24
Voltage drop in a resistance given by
  • A mmf/reluctance
  • B IR
  • C I/R
  • D VI
Answer: Option B
Q25
Off-line converter, SMPS has
  • A AC input and dc output
  • B DC input and dc output
  • C AC input and ac output
  • D None
Answer: Option A
Q26
Filter circuits are constructed by means of
  • A Diode
  • B Resistors
  • C Transformers
  • D Capacitor and inductors
Answer: Option D
Q27
Resistance of the diode is decreased when
  • A Forward biased
  • B Reverse biased
  • C Both forward and reverse biased
  • D Either a or b
Answer: Option A
Q28
In earlier time is used for voltage regulation.
  • A Diode
  • B Transistors
  • C Vacuum tubes and glow bulbs
  • D SMPS
Answer: Option C
Q29
is the equipment used during power failure.
  • A Rectifier
  • B Voltage regulators
  • C UPS
  • D SMPS
Answer: Option C
Q30
Peak factor of the sine wave is equal to
  • A 0.901
  • B 1.414
  • C 1.1
  • D 1.11
Answer: Option B

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