AC Generator and Transformer NEET Questions

Physics - Electromagnetic Induction and Alternating Currents

AC Generator and Transformer MCQ Questions


1.
The working principle of an AC generator is based on:
A.
Newton’s laws
B.
Lenz’s law
C.
Ohm’s law
D.
Faraday’s law of electromagnetic induction
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ANSWER :
D. Faraday’s law of electromagnetic induction
2.
In an AC generator, the induced emf is maximum when the coil is:
A.
At an angle of 60° to the magnetic field
B.
Parallel to the magnetic field
C.
At 45° to the magnetic field
D.
Perpendicular to the magnetic field
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ANSWER :
D. Perpendicular to the magnetic field
3.
The frequency of AC produced by a generator depends on:
A.
Capacitance of the coil
B.
Magnetic field strength
C.
Number of turns in the coil
D.
Speed of rotation of the coil
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ANSWER :
D. Speed of rotation of the coil
4.
The core of a transformer is laminated to

NEET - 2017

A.
Reduce eddy current losses
B.
Increase hysteresis loss
C.
Increase resistance
D.
Reduce flux leakage
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ANSWER :
A. Reduce eddy current losses
5.
The output voltage of an AC generator can be increased by:
A.
Increasing the coil resistance
B.
Decreasing the resistance of the coil
C.
Using thicker wires
D.
Increasing the number of turns in the coil
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ANSWER :
D. Increasing the number of turns in the coil
6.
In an AC generator, the role of slip rings is to:
A.
Connect the coil to the external circuit
B.
Change AC to DC
C.
Reduce voltage fluctuations
D.
Increase power output
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ANSWER :
A. Connect the coil to the external circuit