Alternating Current Test

Result

Alternating Current Test - 47

Score
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Rank
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Weekly Quiz Competition

Question 1
4 / -1

The ratio of peak value and r.m.s. value of an alternating current is

A
1

B

C

D
Question 2
4 / -1

If the value of potential in an ac circuit is 10 V, then the peak value of potential is

A

B

C

D

Solution
Question 3
4 / -1

A lamp consumes only 50% of peak power in an ac circuit. What is the phase difference between the applied voltage and the circuit current

A

B

C

D

Solution
Question 4
4 / -1

The instantaneous voltage through a device of impedance 20 Ω is e = 80 sin 100 πt. The effective value of the current is

A
3 A

B
2.828 A

C
1.732 A

D
4 A

Solution
Question 5
4 / -1

Choke coil works on the principle of

A
Transient current

B
Self induction

C
Mutual induction

D
Wattless current
Question 6
4 / -1

A choke coil has

A
High inductance and low resistance

B
Low inductance and high resistance

C
High inductance and high resistance

D
Low inductance and low resistance
Question 7
4 / -1

Time constant of LC circuit is

A

B

C

D
Question 8
4 / -1

The phase angle between e.m.f. series ac circuit is LCR series ac circuit is

A

B

C

D
π
Question 9
4 / -1

A

B

C

D

Solution
Question 10
4 / -1

The instantaneous value of current in an ac circuit is I = 2 sin (100 πt + π/3) A. The current will bemaximum for the first time at

A

B

C

D

Solution