Page 527 - Basic Electrical Engineering

12. Self inductance of a coil can be expressed as

a.

b.

c.

d. .

13. Self inductance of an air-core coil can be increased by introducing

a. a copper rod inside the core
b. a wooden rod inside the core
c. an iron rod inside the core
d. none of these.

14. The coefficient of coupling of two coils of 4 mH and 16 mH is 0.5. The mutual inductance
between them is

a. 2 mH
b. 4 mH
c. 8 mH
d. 16 mH.

15. The permeability of a magnetic material means

a. its ability to allow establishment of lines of force in it
b. its ability to allow flow of current through it
c. the opposition it would offer to establishment of flux in it
d. its ability to provide high reluctance path to the magnetic flux.

Answers to Multiple Choice Questions

1. (d) 2. (a) 3. (b) 4. (c) 5. (d)

6. (a) 7. (d) 8. (a) 9. (b) 10. (a)

11. (c) 12. (a) 13. (c) 14. (b) 15. (a)