Alternating Current Test

Result

Alternating Current Test - 31

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Question 1
4 / -1

In the a.c. circuit shown in fig. the supply voltage has a constant r.m.s value V, but variable frequency f, Resonance frequency is

A
10

B
100

C
1000

D
200

Solution
Question 2
4 / -1

In the circuit shown in fig if value of R = 60Ω, then the current flowing through the condenser will be

A
0.5 A

B
0.25 A

C
0.75

D
1.0 A

Solution
Question 3
4 / -1

The value of conductance in the adjoining circuit shown if fig is

A
0.1 mho

B
0.025 mho

C
0.103 mho

D
9.7 mho

Solution
Question 4
4 / -1

If number of turns in primary and secondary coils is increased to two times each, the mutual inductance

A
becomes 4 time

B
becomes 2 time

C
becomes 1/4 time

D
remains unchanged

Solution
Question 5
4 / -1

The current flowing in a coil of self inductance 0.4 mH is increased by 250 mA in 0.1 s. The e.m.f induced will be

A
+ 1 V

B
-1V

C
+1 mV

D
–1mV

Solution
Question 6
4 / -1

Mutual inductance of two coils can be increased by

A
decreasing the number of turns in the coils

B
increasing the number of turns in the coils

C
winding the coils on wooden cores

D
none of the above

Solution
Question 7
4 / -1

An LCR series circuit is connected to a source of alternating current. At resonance, the applied voltage and the current flowing through the circuit will have a phase difference of

A
π

B
π/2

C
π/4

D
0
Question 8
4 / -1

In general, in an alternating current circuit

A
the average value of current is zero

B
the average value of square of current is zero

C
average power dissipation is zero

D
the phase difference between voltage and current is zero
Question 9
4 / -1

In a noiseless transformer, an alternating current of 2 ampere is flowing in the primary coil. The no. of turns in the primary and secondary coils are 100 and 20 respectively. The value of the current in secondary coil is

A
0.08 A

B
0.4 A

C
5A

D
10A

Solution
Question 10
4 / -1

In a car spark coil, an emf of 40000 V is induced in a secondary when the primary current changes from 4 A to zero in 10μs. Find the mutual inductance between the primary and secondary windings of the spark coil.

A
0.6 H

B
0.4 H

C
0.2 H

D
0.1 H

Solution