Electromagnetic Induction - Interview Questions | Exam2Win

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11. In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will

A. increase

B. decrease

C. remain the same

D. initially increase and then decrease

Explanation:

12. The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the in ductance will be

A. 3 mH

B. 12 mH

C. 24mH

D. 48mH

Explanation:

13. 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

Explanation:

14. The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is

A. 4 mH

B. 5 mH

C. 6 mH

D. 12 mH

Explanation:

15. 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

Explanation:

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