1.Stator voltage Vs is proportional to
2. In cranes and Lifts type of motor is used
3. Speed torque characteristics of a slip ring motor are
4. Synchronous speed of an induction motor inversely proportional to
5. Range of slip of an induction motor from stand still to synchronous speed
10. When the rotor in
11. Varying the stator voltage can control the induction motor speed as
12. Stator voltage control for speed control of induction motors is suitable for
13. By using AC voltage controller, can be fixed
14. Varying the stator voltage can control the induction motor speed as
15. Stator voltage control for speed control of induction motors is suitable for
16. By using AC voltage controller, can be fixed
17. What is the advantage of an induction motor using stator voltage controller
18. Which of the following motor preferred for high starting torque application
19. Synchronous speed is directly proportional to
20. When torque is equal to zero
21. The torque has a maximum value, called
22. The torque is positive but the speed is negative, so torque appears as breaking torque
23. The slip is greater than unity
24. What is the disadvantage of an induction motor using stator voltage controller
25. Slip speed is proportional to
26. Speed control of AC drives can not be achieved by varyin
27. Different between synchronous speed and actual speed called as
28. Torque is proportional to
29. In closed loop speed control of an induction motor using stator voltage
30. What is the disadvantages of squirrel cage induction motor
31. Which device is suitable for fan control application
32. During electric braking motor current tends to
33. Drive operates in mode whenever an increase in its speed is required
34. Closed loop drives require
35. A special case of plugging occurs when an induction motor connected to positive sequence voltage is driven by an active load in the reversing direction
36. Drive operates in depending on the direction of rotation
38. Frequency control of an induction motor drives employ
39. Variable frequency control of an induction motor, drop in speed from no load to full load is
40. In motoring operation, ( V/f ) ratio is increased at
41.. The breakdown torque is a function of slip at
42. The voltage source inverter has
43. The voltage source inverter allows a variable frequency supply to be obtained from a
44. What is meant by VSI
45. In a current- fed inverter drive, the two control variable are
46.. The major advantage of CSI is
47. In voltage / frequency control, maximum torque obtained is with change in slip
48. When the frequency is reduced, the input voltage must be reduced proportionally is called as
49. The PWM techniques, gain is inversely proportional to
50. The closed loop speed control drive uses a PWM inverter fed from a dc source, which has capability for
1 .stator flux * frequency
2. wound motor
3.rectangular hyperbola
4.Number of poles
5. 1 to 0
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6. k(1-s)2
7. Generating region
8.Rotor resistance
9.Rotor resistance
10. Slip is equal to unity
11.Below the rated speed
12. fan and pump drives
13. supply frequency
14. Below the rated speed
15. fan and pump drives
16. supply frequency
17. There is a consideration saving in energy
18. Slip ring induction motor
19. Frequency
20.Slip is equal to zero
21. Break down torque at slip maximum
22. Plugging
23. Braking region
24. The input power factor is very low
25. Slip
26. Efficiency
27. Slip speed
28. Square of its voltage
29. Varying phase control
30. Starting torque
31. Triac
32. Exceed the safe limit
33. Acceleration
34. Fast response
35. Quadrant IV
36. Quadrant I or III
37. Maximum torque constant
38. Cycloconverter
39. . Small
40. Low frequency
41. Constant frequency
42. . Low internal impedance
43. DC supply
44. Source contains negligible impedance
45. DC link current and frequency
46. More in reliability
47. Variable
48. V/f control
49. Peak value of the carrier wave
50. All four-quadrant operation
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