Alternating Current Test

Result

Alternating Current Test - 16

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Question 1
4 / -1

A resistor and a capacitor are connected in series with an ac source. If the potential drop across the capacitor is 5 V and that across resistor is 12 V, the applied voltage is

A
13 V

B
17 V

C
5 V

D
12 V

Solution
Question 2
4 / -1

An alternating e.m.f. is applied to purely capacitive circuit. The phase relation between e.m.f. and current flowing in the circuit is or In a circuit containing capacitance only

A
e.m.f. is ahead of current by π/2

B
Current is ahead of e.m.f. by π/2

C
Current lags behind e.m.f. by π

D
Current is ahead of e.m.f. by π

Solution
Question 3
4 / -1

The average power dissipated in a pure inductor of inductance L when an ac current is passing through it, is
(Inductance of the coil L and current I)

A

B

C

D
Zero
Question 4
4 / -1

A
1 H

B
2 H

C
3 H

D
0.5 H

Solution
Question 5
4 / -1

An alternating voltage is connected in series with a resistance R and an inductance L. If the potential drop across the resistance is 200V and across the inductance is 150 V, then the applied voltage is

A
350V

B
250V

C
500V

D
300V

Solution
Question 6
4 / -1

In a circuit containing an inductance of zero resistance, the e.m.f. of the applied ac voltage leads the current by

A
90^o

B
45^o

C
30^o

D
0^o

Solution
Question 7
4 / -1

In a pure inductive circuit or In an ac circuit containing inductance only, the current

A
Leads the e.m.f. by 90°

B
Lags behind the e.m.f. by 90°

C
Sometimes leads and sometime lags behind the e.m.f.

D
Is in phase with the e.m.f.
Question 8
4 / -1

A 20 volts ac is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V, the voltage across the coil is

A
16 volts

B
10 volts

C
8 volts

D
6 volts

Solution
Question 9
4 / -1

For a series LCR circuit at resonance, the statement which is not true is

A
Wattless current is zero

B
Power factor is zero

C
Peak energy stored by a capacitor = peak energy stored by an inductor

D
Average power = apparent power

Solution
Question 10
4 / -1

The power factor of LCR circuit at resonance is

A
0.707

B
1

C
Zero

D
0.5