AC Generator and Transformer NEET Questions

Physics - Electromagnetic Induction and Alternating Currents

AC Generator and Transformer MCQ Questions


7.
In an AC generator, the coil is rotated:
A.
About an axis perpendicular to the magnetic field
B.
Without rotation
C.
About an axis parallel to the magnetic field
D.
At any random angle
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ANSWER :
A. About an axis perpendicular to the magnetic field
8.
When the coil of an AC generator is rotated with constant angular velocity ω in a uniform magnetic field B, and N is the number of turns and A is area, the instantaneous emf is:
A.
ε = NBA cos(ωt)
B.
ε = NBAω sin(ωt)
C.
ε = NBAω·cos(ωt)
D.
ε = NBA·ω²·sin(ωt)
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ANSWER :
B. ε = NBAω sin(ωt)
9.
The peak (maximum) value of induced emf in an AC generator is:
A.
NBA/ω
B.
NBA·ω
C.
NBA
D.
NBA·ω²
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ANSWER :
B. NBA·ω
10.
An AC generator's coil has 100 turns, area 0.5 m². It rotates at 50 rev/s in a 0.1 T magnetic field. The peak emf is:
A.
50π V
B.
100π V
C.
500π V
D.
1000π V
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ANSWER :
C. 500π V
11.
In an AC generator, induced emf is maximum when:
A.
Coil is stationary
B.
Plane of the coil is perpendicular to the field
C.
Plane of the coil is parallel to the field
D.
Coil is at 45° to the field
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ANSWER :
C. Plane of the coil is parallel to the field
12.
In an AC generator, induced emf is zero when:
A.
Coil is at 45° angle
B.
Plane of coil is perpendicular to magnetic field
C.
Field is zero
D.
Plane of coil is parallel to field
😑 View Answer Rough Work Error
ANSWER :
B. Plane of coil is perpendicular to magnetic field