Alternating Current Test

Result

Alternating Current Test - 48

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Weekly Quiz Competition

Question 1
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 2
4 / -1

An alternating current of frequency ‘f\' is flowing in a circuit containing a resistance R and a choke L in series.The impedance of this circuit is

A

B

C

D

Solution
Question 3
4 / -1

Same current is flowing in two alternating circuits. The first circuit contains only inductance and the other contains only a capacitor. If the frequency of the e.m.f. of ac is increased, the effect on the value of the current will be

A
Increases in the first circuit and decreases other

B
Increases in both the circuits

C
Decreases in both the circuits

D
Decreases in the first circuit and increases other

Solution
Question 4
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°

B
45°

C
30°

D
0°

Solution
Question 5
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 6
4 / -1

An inductance of 1 mH a condenser of 10 μF and a resistance of 50 Ω are connected in series. The reactances of inductor and condensers are same. The reactance of either of them will be

A
100 Ω

B
30 Ω

C
3.2 Ω

D
10 Ω

Solution
Question 7
4 / -1

An alternating voltage E = 200√2 sin (100 t)is connected to a 1 microfarad capacitor through an ac ammeter. The reading of the ammeter shall be

A
10 mA

B
20 mA

C
40 mA

D
80 mA

Solution
Question 8
4 / -1

The average power dissipation in a pure capacitance in ac circuit is

A

B

C

D
Zero

Solution
Question 9
4 / -1

In a region of uniform magnetic induction B =10^–2tesla, a circular coil of radius 30 cm and resistance π² ohm is rotated about an axis which is perpendicular to the direction of B and which forms a diameter of the coil. If the coil rotates at 200 rpm the amplitude of the alternating current induced in the coil is

A
4 π² mA

B
30 mA

C
6 mA

D
200 mA

Solution
Question 10
4 / -1

An inductive circuit contains a resistance of 10 ohm and an inductance of 2.0 henry. If an ac voltage of 120 volt and frequency of 60 Hz is applied to this circuit, the current in the circuit would be nearly

A
0.32 amp

B
0.16 amp

C
0.48 amp

D
0.80 amp

Solution