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#### AC Fundamentals And Circuit! Important MCQ Questions | Circuit Theory MCQ

Alternating Current MCQs. The frequency of the AC Mains in India is 50 Hz. An alternating current. AC Fundamental and Circuit Theory MCQ online test is very helpful for gate-preparing students.

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Question 1: A resonance curve for a series circuit is a plot of frequency versus?

• reactance
• impedance
• current
• voltage

Question 2: Which of the following is not a non-linear element?

• Heater coil
• Electric arc with unlike electrodes
• Transistor
• Diode

Question 3: A parallel AC circuit in resonance will?

• have current in each section equal to the line current
• act like a resistor of low value
• have a high voltage developed across each inductive and capacitive section
• have a high impedance
• Answers: have a high impedance

Question 4: In an AC circuit, a low value of kVAR compared with kW indicates?

• high power factor
• low efficiency
• unity power factor

Question 5: Time constant of an inductive circuit?

• increases with decrease of inductance and increase of resistance
• increases with increase of inductance and decrease of resistance
• increases with the increase of inductance and the increase of resistance
• increases with decrease of inductance and decrease of resistance
• Answers: increases with the increase of inductance and the increase of resistance

Question 6: In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will?

• be reduced to one fourth
• be reduced by half
• be four times as high
• be doubled

Question 7: The series and parallel resonance on L-C circuit differs in that?

• parallel resonance needs a low resistance source for a sharp rise in line current
• series resistance needs a low-resistance source for sharp rise in current
• parallel resonance needs a low resistance source for a sharp increase in impedance
• series resonance needs a high-resistance source for sharp increase in current
• Answers: series resistance needs a low-resistance source for sharp rise in current

Question 8: Inductance of coil?

• becomes zero with the increase in supp]y frequency
• is unaffected by the supply frequency
• increases with the increase in supply frequency
• decreases with the increase m supply frequency
• Answers: increases with the increase in supply frequency

Question 9: Pure inductive circuit?

• takes power from the line during some part of the cycle and then returns back to it during other part of the cycle
• none of the above
• consumes some power on average
• does not take power at all from a line
• Answers: takes power from the line during some part of the cycle and then returns back to it during other part of the cycle

Question 10: The RMS value of a sine wave is 100A. Its peak value is ?

• 282.8 A
• 70.7 A
• 150 A
• 141.4A

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