Page 728 - Basic Electrical Engineering

c. the supply voltage is reduced to half its value
d. the frequency of supply is gradually reduced.

20. A three-phase induction motor has standstill rotor-circuit resistance, X 20 of 8 Ω and resistance
of 2 Ω. The maximum torque will be developed at starting if the circuit parameters are

a. R = 2 Ω, X = 4 Ω
2
20
b. R = 4 Ω, X = 8 Ω
20
2
c. R = 8 Ω, X = 8 Ω
20
2
d. R = 16 Ω, X = 8 Ω.
2
20
Answers to Multiple Choice Questions

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

5. (b) 6. (b) 7. (b) 8. (c)

9. (a) 10. (d) 11. (b) 12. (a)

13. (d) 14. (c) 15. (d) 16. (d)
17. (b) 18. (c) 19. (b) 20. (c)