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#### AC Fundamentals MCQ | Circuit Theory MCQ | Electrical MCQ

AC Fundamentals, Circuits, And Circuit Theory MCQ questions & answers are available for Electrical Engineering students to clear Gate exams.

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Question 1: The voltage of domestic supply is 220 V. This value represents?

• average value
• mean value
• RMS value
• peak value

Question 2: Magnitude of current at resonance in R-L-C circuit?

• depends upon the magnitude of R, L and C
• depends upon the magnitude of R
• depends upon the magnitude of L
• depends upon the magnitude of C
• Answers: depends upon the magnitude of R, L and C

Question 3: ln a series resonant circuit, the impedance of the circuit is?

• none of the above
• zero
• maximum
• minimum

Question 4: For a purely resistive circuit the following statement is in correct?

• Heat produced is zero
• Power factor is unity
• Power consumed is zero
• Work done is zero
• Answers: Power factor is unity

Question 5: The ability of a resonant circuit to discriminate between one particular frequency and all others is called its?

• none of the above
• impedance
• selectivity
• conductance

Question 6: In any AC circuit always?

• reactive power is more than actual power
• actual power is more than reactive power
• reactive power is more than apparent power
• apparent power is more than actual power
• Answers: apparent power is more than actual power

Question 7: While drawing vector diagram for a series circuit, the reference vector is?

• phase angle
• current
• voltage
• power

Question 8: The inductance of a coil can be increased by?

• decreasing the number of turns
• increasing core length
• choosing core material having high relative permeability
• decreasing the diameter of the former
• Answers: choosing core material having high relative permeability

Question 9: When an alternating current passes through an ohmic resistance the electrical power converted into heat is?

• true power
• none of the above
• apparent power
• reactive power

Question 10: At very low frequencies a series R-C circuit behaves as almost purely ......?

• none of the above
• resistive
• inductive
• capacitive

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