AC Circuit objective questions (MCQ) and answers
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Electrical engineering questions on AC Fundamental and Circuit theory MCQ online test, It’s very helpful for GATE preparing students.
- voltage increases
- R increases
- R decreases
- impedance increases
Question 1: The quality factor of R-L-C circuit will increase if?
Answers: R decreases
- power
- form
- demand
- load
Question 2: The ratio of active power to apparent power is known as ...... factor?
Answers: power
- 0.5 s
- 0.05 s
- 0.0005 s
- 0.005 s
Question 3: For a frequency of 200 Hz, the time period will be?
Answers: 0.005 s
- quality factor
- selectivity
- susceptance
- impedance
Question 4: The ratio of the bandwidth to the resonance frequency is called the ...... of the circuit?
Answers: selectivity
- 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
Question 5: A phaser is?
Answers: a line which represents the magnitude and phase of an alternating quantity
- 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
Question 6: Power factor of the system is kept high?
Answers: due to all above reasons
- all of the above
- unequal line voltages across the load
- high voltage across the load
- low voltage across the load
Question 7: ln a three-phase supply floating neutral is undesirable because it way give rise to?
Answers: unequal line voltages across the load
- 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
Question 8: Capacitive susceptance is a measure of?
Answers: a purely capacitive circuit's ability to pass current
- applied voltage decreases but current increases
- both applied voltage and current decrease
- both applied voltage and current increase
- applied voltage increases but current decreases
Question 9: Pure inductive circuit takes power from the AC line when?
Answers: applied voltage decreases but current increases
- half wave rectified sine wave
- triangular wave
- sine wave
- square wave
Question 10: The RMS value and mean value is the same in the case of?
Answers: square wave
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