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This mock test of Test: Power In an AC Circuit for Class 12 helps you for every Class 12 entrance exam.
This contains 10 Multiple Choice Questions for Class 12 Test: Power In an AC Circuit (mcq) to study with solutions a complete question bank.
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QUESTION: 1

Find the total voltage applied in a series RLC circuit when i=3mA, VL=30V, VC=18V and R=1000 ohms.

Solution:

Explanation: Total voltage= VR+VL+VC.

VR=1000x3x10-3=3V.

Therefore, total voltage = 30+18+3=51V.

QUESTION: 2

The power factor of an RL circuit 1/root2. If the frequency of a.c. is doubled, what will be the power factor?

Solution:

QUESTION: 3

When an emf E = 7cos wt is applied across a circuit, the current is I = 5coswt. What is the power factor for the circuit?

Solution:

QUESTION: 4

What is value of power factor if Ø = 90°

Solution:

QUESTION: 5

Power in an ac circuit is equal to

Solution:

QUESTION: 6

If the instantaneous current in a circuit is given by i = 2 cos (ωt - φ) A, the rms value of the current is

Solution:

QUESTION: 7

Find the true power given apparent power = 10 W and power factor = 0.5

Solution:

QUESTION: 8

What is the average power/cycle in a capacitor?

Solution:

QUESTION: 9

What is phase angle given R = 10, Z = 20

Solution:

QUESTION: 10

In a circuit, the reactance X and resistance R are equal. What is the power factor?

Solution:

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