## Circuits and Circuit Theory Part 10

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Attempt Free Circuits and Circuit Theory Part 10 Here. Read The Important Electrical MCQ From Below.

1. The peak value of a sine wave is 200 V. Its average value is

(A) 127.4 V

(B) 141.4 V

(C) 282.8 V

(D) 200 V

Correct Answer

2. The inductance of a coil can be increased by

(A) Increasing core length

(B) Decreasing the number of turns

(C) Decreasing the diameter of the former

(D) Choosing core material having high relative permeability

Correct Answer

Circuits and Circuit Theory Part 10

3. For a sine wave with peak value Imax the r.m.s. value is

(A) 0.5 Imax

(B) 0.707

(C) 0.9

(D) 1.414 Imax

Correct Answer

4. For a frequency of 200 Hz, the time period will be

(A) 0.05 s

(B) 0.005 s

(C) 0.0005 s

(D) 0.5 s

Correct Answer

Circuits and Circuit Theory Part 10

5. The ratio of active power to apparent power is known as factor.

(A) Demand

(B) Load

(C) Power

(D) Form

Correct Answer

6. The best place to install a capacitor is

(A) Very near to inductive load

(B) Across the terminals of the inductive load

(C) Far away from the inductive load

(D) Any where

Correct Answer

7. Inductance of a coil Varies

(A) Directly as the cross-sectional area of magnetic core

(B) Directly as square of number of turns

(C) Inversely as the length of the iron path

(D) As (A) to (C)

Correct Answer

Circuits and Circuit Theory Part 10

8. Power factor of the following circuit will be unity

(A) Inductance

(B) Capacitance

(C) Resistance

(D) Both (A) and (B)

Correct Answer

9. The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces

(A) The more heat than produced by A.C. when flowing through the same circuit

(B) The same heat as produced by A.C. when flowing through the same circuit

(C) The less heat than produced by A.C. flowing through the same circuit

(D) None of the above

Correct Answer

Circuits and Circuit Theory Part 10

10. In a pure resistive circuit

(A) Current lags behind the voltage by 90°

(B) Current leads the voltage by 90°

(C) Current can lead or lag the voltage by 90°

(D) Current is in phase with the voltage

Correct Answer

11. Time constant of a circuit is the time in seconds taken after the application of voltage to each

(A) 25% of maximum valu

(B) 50% of maximum value

(C) 63% of maximum value

(D) 90% of the maximum value

Correct Answer

Circuits and Circuit Theory Part 10

12. What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value?

(A) 0°

(B) 45°

(C) 90°

(D) 180°

Correct Answer