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Alternative Current MCQ Level - 1


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30 Questions MCQ Test | Alternative Current MCQ Level - 1

Alternative Current MCQ Level - 1 for Class 12 2022 is part of Class 12 preparation. The Alternative Current MCQ Level - 1 questions and answers have been prepared according to the Class 12 exam syllabus.The Alternative Current MCQ Level - 1 MCQs are made for Class 12 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Alternative Current MCQ Level - 1 below.
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Alternative Current MCQ Level - 1 - Question 1

ln a choke coil, the reactance XL and resistance R are such that

Alternative Current MCQ Level - 1 - Question 2

A100 V, AC source of frequency 500 Hz is connected to an L-C-R circuit with L = 8.1 mH, C = 12.5μF, R = 10W all connected in series as shown in figure. What is the quality factor of circuit?

Alternative Current MCQ Level - 1 - Question 3

In a circuit L, C and R are connected in series with an alternating voltage source of frequency f. The current leads the voltage by 45°. The value of C is  

Alternative Current MCQ Level - 1 - Question 4

The natural frequency (ω0) of oscillations in L-C circuit is given by

Alternative Current MCQ Level - 1 - Question 5

In L-C-R series circuit the resonance condition in terms of capacitive reactance (XC) and inductive reactance (XL) is

Alternative Current MCQ Level - 1 - Question 6

Average power generated in an inductor connected to an AC source is

Alternative Current MCQ Level - 1 - Question 7

In L-C-R circuit if resistance increases, quality factor

Alternative Current MCQ Level - 1 - Question 8

An electric bulb has a rated power of 50 W at 100 V. If it is used on an AC source 200 V, 50 Hz, a choke has to be used in series with it. The should have an inductance of

Alternative Current MCQ Level - 1 - Question 9

From figure shown below a series L-C-R circuit connected to a variable frequency 200 V source. C = 80μF and R = 40W . Then the source frequency which drive the circuit at resonance is 

 

Alternative Current MCQ Level - 1 - Question 10

In an L-C-R series AC circuit, the voltage across each of components. L,C and R is 50 V. The voltage across the L-C combination will be

Alternative Current MCQ Level - 1 - Question 11

In an L-C-R circuit, capacitance is changed from C to 2C. For the resonant frequency to remain unchanged, the inductance should be changed from L to

Alternative Current MCQ Level - 1 - Question 12

Which of the following statement is incorrect?

Alternative Current MCQ Level - 1 - Question 13

The impedance of a circuit, when a resistance R and an Inductor of inductance L are connected in series in an AC circuit of frequency f, is

Alternative Current MCQ Level - 1 - Question 14

ln a series L-C-R circuit, resistance R = 10W and the impedance Z = 10W. The phase difference between the current and the voltage is.

Alternative Current MCQ Level - 1 - Question 15

A circuit consists of an inductance of 0.5 mH and a capacitor of 20μF. The frequency of the L-C oscillations is approximately

Alternative Current MCQ Level - 1 - Question 16

An inductor is connected to an AC source. When compared to voltage, the current in the lead wires 

Alternative Current MCQ Level - 1 - Question 17

An inductance 1 H is connected in series with an AC source of 220 V and 50 Hz. The inductive reactance (in ohm) is

Alternative Current MCQ Level - 1 - Question 18

The power factor of an AC circuit having resistance R and inductance L (connected in series) and an angular velocity ω is

Alternative Current MCQ Level - 1 - Question 19

If the capacity of a condenser is 1 F, then its resistance in a DC circuit will be

Alternative Current MCQ Level - 1 - Question 20

A capacitor 50μF is connected to a supply of 220 V and angular frequency 50 rad s-1. The value of rms current in the circuit is

Alternative Current MCQ Level - 1 - Question 21

In a series L-C-R circuit the frequency of a 10 V AC voltage source is adjusted in such a fashion that the reactance of the inductor measures15  and that of the capacitor11. If R = 3, the potential difference across the series combination of L and C will be

Alternative Current MCQ Level - 1 - Question 22

A circuit draws 330 W from a 110 V, 60 Hz AC line. The power factor is 0.6 and the current lags the voltage. The capacitance of a series capacitor that will result in a power factor of unity is equal to

Alternative Current MCQ Level - 1 - Question 23

In L-R circuit, resistance is 8  and inductive reactanceis 6,  then impedance is

Alternative Current MCQ Level - 1 - Question 24

In L-C-R circuit, an alternating emf of angular frequency ω is applied then the total impedance will be

Alternative Current MCQ Level - 1 - Question 25

In AC circuit a resistance of R is connected in series with an inductance L. If the phase difference between the current and voltage is 45°, the inductive reactance will be

Alternative Current MCQ Level - 1 - Question 26

The current which does not contribute to the power consumed in an AC circuit is called?

Alternative Current MCQ Level - 1 - Question 27

The power loss in AC circuit will be minimum when

Alternative Current MCQ Level - 1 - Question 28

In a series combination R = 300, L = 0.9 H, C = 2.0 μF, ω = 1000 rads-1, the impedance of the circuit is

Alternative Current MCQ Level - 1 - Question 29

For a series L-C-R circuit, the phase difference between current and voltage at the condition of resonance will be

Alternative Current MCQ Level - 1 - Question 30

In a L-R circuit of 3 mH inductance and 4 resistance, emf E = 4 cos 1000tV is applied. The amplitude of emf is

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