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#### AC Circuit objective questions (MCQ) and answers

Electrical engineering questions on AC Fundamental and Circuit theory MCQ online test, It’s very helpful for GATE preparing students.

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Question 1: The quality factor of R-L-C circuit will increase if?

• voltage increases
• R increases
• R decreases
• impedance increases

Question 2: The ratio of active power to apparent power is known as ...... factor?

• power
• form
• demand

Question 3: For a frequency of 200 Hz, the time period will be?

• 0.5 s
• 0.05 s
• 0.0005 s
• 0.005 s

Question 4: The ratio of the bandwidth to the resonance frequency is called the ...... of the circuit?

• quality factor
• selectivity
• susceptance
• impedance

Question 5: A phaser is?

• an instrument used for measuring phases of an unbalanced B-phase load
• a coloured tag or band for distinction between. different phases of a 3°-phase supply
• a line which represents the magnitude and phase of an alternating quantity
• a line representing the magnitude and direction of an alternating quantity
• Answers: a line which represents the magnitude and phase of an alternating quantity

Question 6: Power factor of the system is kept high?

• to maximise the utilization of the capacities of generators, lines and transformers
• to reduce line losses
• to reduce voltage regulation of the line
• due to all above reasons
• Answers: due to all above reasons

Question 7: ln a three-phase supply floating neutral is undesirable because it way give rise to?

• all of the above
• unequal line voltages across the load
• high voltage across the load
• low voltage across the load

Question 8: Capacitive susceptance is a measure of?

• a purely capacitive circuit's ability to resist the flow of current
• reactive power in a circuit
• a purely capacitive circuit's ability to pass current
• the extent of neutralisation of reactive power in a circuit
• Answers: a purely capacitive circuit's ability to pass current

Question 9: Pure inductive circuit takes power from the AC line when?

• applied voltage decreases but current increases
• both applied voltage and current decrease
• both applied voltage and current increase
• applied voltage increases but current decreases
• Answers: applied voltage decreases but current increases

Question 10: The RMS value and mean value is the same in the case of?

• half wave rectified sine wave
• triangular wave
• sine wave
• square wave

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