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Power in Alternating - Current Circuits MCQ

we are going to share Multiple Choice Questions (MCQ) on AC Fundamentals for Electrical Engineering Students.

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Question 1: The period of a sine wave is 5 seconds. Its frequency is?

• 20 Hz
• 40 Hz
• 50 Hz
• 30 Hz

Question 2: Ohm is unit of all of the following except?

• capacitance
• capacitive reactance
• inductive reactance
• resistance

Question 3: In a purely inductive circuit?

• none of above is zero
• apparent power is zero
• reactive power is zero
• actual power is zero
• Answers: actual power is zero

Question 4: Form factor for a sine wave is?

• 0.637
• 1.11
• 1.414
• 0.707

Question 5: In a circuit containing R, L and C, power loss can take place in?

• C only
• all of the above
• R only
• L only

Question 6: Power factor of magnetising component of current of a transformer is?

• unity
• 0.8 lag
• zero

Question 7: For the same peak value, which of the following wave bas the least mean value ?

• triangular wave
• half wave rectified sine wave
• square wave
• sine wave
• Answers: half wave rectified sine wave

Question 8: All the rules and laws of DC circuit also apply to AC circuit containing?

• inductance only
• all of the above
• resistance only
• capacitance only

Question 9: The frequency of domestic power supply in India is?

• 50 Hz
• 200 Hz
• 100 Hz
• 60 Hz

Question 10: The power factor of a DC circuit is always?

• zero
• less than unity
• greater than unity
• unity

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Total Questions Attempted: 0

Correct: 0 Wrong: 0

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