AC Fundamentals MCQs Part 1

Electrical Engineering MCQs on AC Fundamentals

The voltage of domestic supply is 220 V. The number 220 is

The voltage of domestic supply is 220 V. The number 220 is

1. Average value
2. Mean value
3. Peak value
4. RMS value

Correct answer: 4. RMS value

The RMS value of alternating current is given by steady DC current which when flowing through a given circuit for a given time produces

The RMS value of alternating current is given by steady DC current which when flowing through a given circuit for a given time produces

1. The more heat than produced by A.C. when flowing through the same circuit
2. The same heat as produced by A.C. when flowing through the same circuit
3. The less heat than produced by A.C. flowing through the same circuit
4. None of these

Correct answer: 2. The same heat as produced by A.C. when flowing through the same circuit

In highly capacitive circuit which of following is correct

In highly capacitive circuit which of following is correct

1. Actual power is more than its reactive power
2. Apparent power is equal to the actual power
3. Reactive power is more than the actual power
4. Reactive power is more than the apparent power

Correct answer: 3. Reactive power is more than the actual power

In pure resistive circuit

In pure resistive circuit

1. Current can lead or lag the voltage by 90°
2. Current is in phase with the voltage
3. Current lags behind the voltage by 90°
4. Current leads the voltage by 90°

Correct answer: 2. Current is in phase with the voltage

Keeping the same peak value which of the following wave will have the highest RMS value

Keeping the same peak value which of the following wave will have the highest RMS value

1. Half wave rectified sine wave
2. Sine wave
3. Square wave
4. Triangular wave

Correct answer: 3. Square wave