Page 99 - Basic Electrical Engineering

c. Watt-hour
d. Joules.

14. Self-inductance of two magnetically coupled coils are 8 H and 2 H, respectively. What
coefficient of coupling will make their mutual inductance equal to 4 H?

a. K = 0.5
b. K = 0.25
c. 0.1
d. 1.0.

15. Which of the following eq. is incorrect with respect of increase in resistance with increase in
temperature of a conducting material?

a.
R =R (1+αt)
0
t
b.
R = R [1+α (t − t )]
1
1 2
1
2
c.

d.
R = R [1−α (t − t )].
1
1
1 2
2
Answers to Multiple Choice Questions

1. (b) 2. (b) 3. (d) 4. (c) 5. (d)
6. (b) 7. (d) 8. (b) 9. (a) 10. (c)

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