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
- (C) Amount of flux linkages
- (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)
Next Tests: