Alternating Current Test

Result

Alternating Current Test - 21

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Weekly Quiz Competition

Question 1
4 / -1

The self inductance of the motor of an electric fan is 10 H. In order to impart maximum power of 50 Hz, it should be connected to a capacitance of

A
1 µF

B
2 mF

C
4 mF

D
8 mF

Solution
Question 2
4 / -1

A 50 volt ac is applied across an RC (series) network. The r.m.s. voltage across the resistance is 40 volt, then the potential across the capacitance would be

A
10 V

B
20 V

C
30 V

D
40 V

Solution
Question 3
4 / -1

A pure inductance coil of 30 mH is connected to an ac source of 220 V. The r.m.s. current in the coil is

A
50.35 A

B
23.4 A

C
30.5 A

D
12.3 A

Solution
Question 4
4 / -1

In ac series circuit, the resistance, inductive reactance and capacitive reactance are 3Ω,10Ω and 14Ω respectively. The impedance of the circuit is

A
5Ω

B
4Ω

C
7Ω

D
10Ω

Solution
Question 5
4 / -1

When 100 volts dc is supplied across a solenoid, a current of 1.0 ampere flows in it. When 100 volts ac is applied across the same coil, the current drops to 0.5 ampere. If the frequency of ac source is 50 Hz, then the impedance and inductance of the solenoid are

A
200Ω and 0.55 henry

B
100Ω and 0.86 henry

C
200Ω and 1.0 henry

D
100Ω and 0.93 henry

Solution
Question 6
4 / -1

In an LR-circuit, the inductive reactance is equal to the resistance R of the circuit. An e.m.f. E = E₀cos (ωt) is applied to the circuit. The power consumed in the circuit is

A

B

C

D

Solution
Question 7
4 / -1

One 10 V, 60 W bulb is to be connected to 100 V line. The required induction coil has self inductance of value (f = 50 Hz)

A
0.052 H

B
2.42 H

C
16.2 mH

D
1.62 mH

Solution
Question 8
4 / -1

In a series circuit C = 2µF, L =1 mH and R=10Ω. When the current in the circuit is maximum, at that time the ratio of the energies stored in the capacitor and the inductor will be

A
1 : 1

B
1 : 2

C
2 : 1

D
1 : 5

Solution
Question 9
4 / -1

An alternating e.m.f. of angular frequency ω is applied across an inductance. The instantaneous power developed in the circuit has an angular frequency

A
ω/4

B
ω/2

C
ω

D
2ω

Solution
Question 10
4 / -1

A telephone wire of length 200 km has a capacitance of 0.014µF per km. If it carries an ac of frequency 5 kHz, what should be the value of an inductor required to be connected in series so that the impedance of the circuit is minimum

A
0.35 mH

B
35 mH

C
3.5 mH

D
Zero

Solution