Alternating Current Test

Result

Alternating Current Test - 33

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Weekly Quiz Competition

Question 1
4 / -1

An inductance L having a resistance R is connected to an alternating source of angular frequency ω. The quality factor (Q) of the inductance is

A

B

C

D

Solution
Question 2
4 / -1

A uniform but time varying magnetic field B (t) exists in a circular region of radius a and is directed into the plane of the paper as shown. The magnitude of indudced electric field at point P at a distance r from the centre of the circular region is

A
zero

B
decreases as 1 / r

C
increases as r

D
decreases as 1/r²

Solution
Question 3
4 / -1

A wind powered generator converts wind energy into electrical energy. Assume that the generator converts a fixed fraction of the wind energy intercepted by its blades into electric energy. For wind speed v, the electric power output will be proportional to

A
ν

B
ν²

C
ν³

D
ν⁴

Solution
Question 4
4 / -1

Two circular coils can be arranged in any of the three situations shown in fig. their mutual inductance will be

A
maximum in situation (i)

B
maximum in situation(ii)

C
maximum in situation (iii)

D
the same in all situations
Question 5
4 / -1

The current flowing in a step down transformer 220 V to 22 V having impedance 220Ω is

A
1A

B
0.1 A

C
1 mA

D
0.1 mA

Solution
Question 6
4 / -1

A capacitor of capacity C has reactance X.If capacitance and frequency become double, then reactance will be

A
4 X

B
X/2

C
X/4

D
2 X

Solution
Question 7
4 / -1

The power factor of an a.c. circuit having resistance R and inductance L connected in series to an a.c. source of angular frequency ω is

A
R/ωL

B
ωL/R

C

D
zero

Solution
Question 8
4 / -1

A coil having 500 square loops of side 10cm is placed normal to magnetic field which increases at a rate of 1 T/sec. The induced e.m.f is

A
0.1 V

B
0.5 V

C
1 V

D
5 V

Solution
Question 9
4 / -1

Power delivered by the source in the circuit is maximum, when

A
ωL = ωC

B
ωL = 1/ωC

C
ωL = ωC²

D

Solution
Question 10
4 / -1

An inductor L and a capacitor C are connected in the circuit as shown in fig. The frequency of power supply is equal to the resonance frequency of the circuit. Which ammeter will read zero ampere?

A
A₁

B
A₂

C
A₃

D
none of these.