Alternating Current Test

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Alternating Current Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

A pair of slip rings is used in

A
a.c. generator

B
d.c. generator

C
a.c. motor

D
d.c. motor .
Question 2
1 / -0

The core of a transformer is laminated to

A
reduce eddy current losses ,

B
increase magnetic flux ,

C
increase strength of magnetic field ,

D
increase residual magnetism .
Question 3
1 / -0

A generator produces a voltage that is given by V = 240 sin 120 t volt , where t is in second . The frequency and r.m.s voltage are

A
60 Hz . & 240 volt

B
19 Hz . & 120 volt

C
19 Hz . &170 volt

D
754 Hz . & 170 volt
Question 4
1 / -0

Magnitude of e.m.f. produced in a coil , when a magnet is inserted into it dose not depend upon

A
number of turns in the coil

B
resistance of the coil

C
magnetic moment of magnet

D
speed of the magnet .
Question 5
1 / -0

Lenzs law is a consequence of the law of conservation of

A
charge

B
mass

C
momentum

D
energy
Question 6
1 / -0

Energy dissipates in LCR circuit in

A
L only

B
C only

C
R only

D
All of the above .
Question 7
1 / -0

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
the average power dissipation is zero

D
the phase difference between voltage and current is zero .
Question 8
1 / -0

A 20 volt a.c. is applied to a circuit consisting of a resistance & a coil with a negligible resistance . If the voltage across the resistance is 12 volts , the voltage across the coil is

A
16 volt

B
10 volt

C
8 volt

D
6 volt .
Question 9
1 / -0

The back emf. In a DC motor is maximum when

A
the motor has picked up max . Speed .

B
the motor has just started moving .

C
the speed of motor is still on the increase .

D
the motor has just been switched off .
Question 10
1 / -0

The current passing through a choke coil of 5 henry is decreasing at the rate of 2 amp./sec . The e.m.f.developed across the coil is .

A
10 V

B
- 10 V

C
-6

D
6

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Alternating Current Test - 2

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Alternating Current Test - 2

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SHARING IS CARING

Question 1

a.c. generator

d.c. generator

a.c. motor

d.c. motor .

Question 2

reduce eddy current losses ,

​​​​increase magnetic flux ,

​​​​increase strength of magnetic field ,

increase residual magnetism .

Question 3

60 Hz . & 240 volt

19 Hz . & 120 volt

19 Hz . &170 volt

754 Hz . & 170 volt

Question 4

number of turns in the coil

resistance of the coil

magnetic moment of magnet

speed of the magnet .

Question 5

charge

mass

momentum

energy

Question 6

​​​​​L only

C only

​​​​​R only

All of the above .

Question 7

the average value of current is zero

the average value of square of current is zero

the average power dissipation is zero

the phase difference between voltage and current is zero .

Question 8

16 volt

10 volt

8 volt

6 volt .

Question 9

the motor has picked up max . Speed .

the motor has just started moving .

the speed of motor is still on the increase .

the motor has just been switched off .

Question 10

10 V

- 10 V

-6

6

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increase magnetic flux ,

increase strength of magnetic field ,

L only

R only