Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 7

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Weekly Quiz Competition

Question 1
4 / -1

The factor, on which the frequency of an AC generator depends,

A
Material of generator

B
Speed of rotation

C
Area of coil

D
Number of turns in coil

Solution

The answer provided in the forum is wrong, the correct answer would be option B and D both.
Solution:
Frequency of a.c, ν=w/2π, where w is the speed of rotation
Also, frequency is defined as the number of rotations that a coil rotates in one second.
Question 2
4 / -1

AC generator produces

A
alternating current from mechanical energy

B
alternating current from electrical energy

C
alternating current from kinetic energy

D
alternating current from chemical energy

Solution

Generator is a device that converts mechanical energy to electrical energy for use in an external circuit.
Question 3
4 / -1

Which of the following is used to determine the direction of induced current in a generator?

A
Fleming’s left hand rule

B
Ampere’s swimming rule

C
Maxwell’s corkscrew rule

D
Fleming’s right hand rule

Solution

Fleming's Right hand rule: Hold a current-carrying conductor in your right hand with thumb in the direction of the current, the direction of the field lines will be the direction of your fingers.
Question 4
4 / -1

Efficiency of electric motor is always less than

A
75%

B
100%

C
50%

D
25%

Solution

Electric motors have an efficiency of less than 100% because there is ALWAYS energy loss through any mechanism imaginable.
Question 5
4 / -1

Induced e.m.f is given by it will be maximum when ,

A
sin ωt = 0.5

B
sin ωt = 0

C
sin ωt = -1

D
sin ωt = 1

Solution

The rate of change of flux linkage is directly proportional to the induced EMF in a coil. Hence, the EMF is maximum when the rate of change of flux linkage is maximum.