AC Generator and Transformer NEET Questions

Physics - Electromagnetic Induction and Alternating Currents

AC Generator and Transformer MCQ Questions


7.
For an ideal transformer, the power in the primary coil is

NEET - 2021

A.
Equal to the power in the secondary coil
B.
Greater than the power in the secondary coil
C.
Less than the power in the secondary coil
D.
Zero
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ANSWER :
A. Equal to the power in the secondary coil
8.
A transformer works on the principle of:
A.
Mutual induction
B.
Self-induction
C.
Ohm’s law
D.
Electrostatic induction
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ANSWER :
A. Mutual induction
9.
The function of a step-up transformer is to:
A.
Increase voltage
B.
Decrease voltage
C.
Increase current
D.
Decrease current
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ANSWER :
A. Increase voltage
10.
The frequency of output AC voltage in an AC generator depends on

NEET - 2016

A.
Magnetic field strength
B.
Speed of rotation
C.
Number of coils
D.
All of these
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ANSWER :
D. All of these
11.
In a transformer, the primary and secondary coils are wound around:
A.
Wooden core
B.
Copper core
C.
Steel core
D.
Iron core
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ANSWER :
D. Iron core
12.
The efficiency of a transformer is given by:
A.
Input power / Output power
B.
Output power / Input power
C.
Output voltage / Input voltage
D.
Equal to 100%
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ANSWER :
B. Output power / Input power