Alternating Current Test

Result

Alternating Current Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

A choke coil is preferred to a rheostat in ac circuit as

A
It consumes almost zero power

B
It increases current

C
It increases power

D
It increases voltage

Solution

A choke coil contains high inductance but negligible resistance, due to which power loss becomes appreciably small.
Question 2
1 / -0

In general in an alternating current circuit

A
The average value of current is zero

B
The average value of square of the current is zero

C
Average power dissipation is zero

D
The phase difference between voltage and current is zero

Solution

In an alternating current circuit the average value of current is zero.
Question 3
1 / -0

Choke coil works on the principle of

A
Transient current

B
Self-induction

C
Mutual induction

D
Wattles current

Solution

Choke coil works on the principle of Self-induction
Question 4
1 / -0

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

A
0 to π/2

B
π/4

C
π/2

D
π

Solution

The phase angle between e.m.f. and current in LCR series ac circuit is 0 to π/2
Question 5
1 / -0

For series LCR circuit, wrong statement is

A
Applied e.m.f. and potential difference across resistance are in same phase

B
Applied e.m.f. and potential difference at inductor coil have phase difference of π/2

C
Potential difference at capacitor and inductor has phase difference of π/2

D
Potential difference across resistance and capacitor has phase difference of π/2

Solution

Potential difference at capacitor and inductor has phase difference of π/2 , is a wrong statement.
Question 6
1 / -0

In an ac circuit, the power factor

A
Is zero when the circuit contains an ideal resistance only

B
Is unity when the circuit contains an ideal resistance only

C
Is zero when the circuit contains an ideal inductance only

D
Is unity when the circuit contains an ideal inductance only

Solution

In an ac circuit, the power factor Is zero when the circuit contains an ideal inductance only.

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Re-Attempt Weekly Quiz Competition

Alternating Current Test - 13

Result

Alternating Current Test - 13

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SHARING IS CARING

Question 1

It consumes almost zero power

It increases current

It increases power

It increases voltage

Solution

Question 2

The average value of current is zero

The average value of square of the current is zero

Average power dissipation is zero

The phase difference between voltage and current is zero

Solution

Question 3

Transient current

Self-induction

Mutual induction

Wattles current

Solution

Question 4

0 to π/2

π/4

π/2

π

Solution

Question 5

Applied e.m.f. and potential difference across resistance are in same phase

Applied e.m.f. and potential difference at inductor coil have phase difference of π/2

Potential difference at capacitor and inductor has phase difference of π/2

Potential difference across resistance and capacitor has phase difference of π/2

Solution

Question 6

Is zero when the circuit contains an ideal resistance only

Is unity when the circuit contains an ideal resistance only

Is zero when the circuit contains an ideal inductance only

Is unity when the circuit contains an ideal inductance only

Solution

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