Electromagnetic Induction Practice Questions - Set 01 - ObjectiveBooks

# Practice Test: Question Set - 01

1. The magnitude of the induced e.m.f. in a conductor depends on the
(A) Flux density of the magnetic field
(B) Amount of flux cut
(D) Rate of change of flux-linkages

2. For a purely inductive circuit which of the following is true?
(A) Apparent power is zero
(B) Relative power is zero
(C) Actual power of the circuit is zero
(D) Any capacitance even if present in the circuit will not be charged

3. Two coils have inductances of 8 mH and 18 mH and a coefficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be
(A) 32 mH
(B) 38 mH
(C) 40 mH
(D) 48 mH

4. A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be
(A) 10 V
(B) 15 V
(C) 25 V
(D) 50 V

5. An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is
(A) 20 Wb
(B) 2 Wb
(C) 0.2 Wb
(D) 0.02 Wb

6. Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is
(A) 5 mH
(B) 10 mH
(C) 5 H
(D) 10 H

7. Reversing the field or the current will reverse the force on the conductor.
(A) Yes
(B) No

8. The coefficient of coupling between two air core coils depends on
(A) Self-inductance of two coils only
(B) Mutual inductance between two coils only
(C) Mutual inductance and self inductance of two coils
(D) None of the above

9. A crack in the magnetic path of an inductor will result in
(A) Unchanged inductance
(B) Increased inductance
(C) Zero inductance
(D) Reduced inductance

10. In case of an inductance, current is proportional to
(A) Voltage across the inductance
(B) Magnetic field
(C) Both (A) and (B)
(D) Neither (A) nor (B)

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