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

Virtual value or effective value of a.c. is

Solution:

** Answer :- d**

**Solution :- as we know that H= (I _{0}^{2 }R)/2 * T/2 -----------------------(1)**

**If I(rms) be the rms value of ac then**

**H = I ^{2}_{(rms)}R T/2 ---------------------(2)**

**From eq (1)&(2)**

**I ^{2}_{(rms)}R T/2 = (I_{0}^{2}R)/2 * T/2**

**I ^{2}_{(rms)} = (I_{0}^{2})/2**

**= I _{(rms)}= (I_{0})/(2)^{½}**

**= I _{(rms)} = 0.707 I_{0}**

QUESTION: 2

Given the instantaneous value of current from a.c. source is I = 8 sin 623t. Find the r.m.s value of current

Solution:

QUESTION: 3

What is time constant

Solution:

QUESTION: 4

Find the instantaneous voltage for an a.c. supply of 200V and 75 hertz

Solution:

**Answer :- b**

**Solution :- f = 75hz**

**w=2πf**

**= 2 * π * 75**

**= 150π**

**E(max) = (2)^½ E(rms)**

**E(max) = 1.414 * 200**

**= 282.8V**

**E(ins) = E(max)sinwt**

**E(ins) = 282.8 sin 150πt**

QUESTION: 5

If a capacitor of capacitance 9.2F has a voltage of 22.5V across it. Calculate the energy of the capacitor.

Solution:

QUESTION: 6

Alternating current is represented by

Solution:

Alternating current is an electric current which periodically reverses direction, as opposed to direct current which flows only in one direction. And it can be easily represented by the periodic function.

So, I = I_{o} sin wt or I = l_{o} cos wt.

QUESTION: 7

What is the relationship between E_{m} and E_{0}

Solution:

QUESTION: 8

The only component that dissipates energy in ac circuit is:

Solution:

QUESTION: 9

Which is more dangerous?

Solution:

QUESTION: 10

The average power dissipation in pure resistive circuit is:

Solution:

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