Question 1 of 41

1. 28. Calculate the slot distance for a ceiling fan with 28 slots, 14 poles, and 14 coils in half-coil connection?

180°

240°

90°

120°

Question 1 of 41

Question 2 of 41

2. 16. How the direction of rotation of a capacitor start induction run motor is reversed?

By interchanging main winding terminals

By changing the capacitor connections

By interchanging both main and auxiliary winding terminals

By changing the supply terminals

Question 2 of 41

Question 3 of 41

3. 26. Which motor is having half-coil winding?

Ceiling fan

Washing machine

None of the above

Mixer Grinder

Question 3 of 41

Question 4 of 41

4. 32. Which type of single-phase motor has very high starting torque?

Capacitor start induction run motor

Repulsion start induction run motor

Reluctance motor

Universal motor

Question 4 of 41

Question 5 of 41

5. 19. What is the angular displacement between starting and running winding of a single phase induction motor?

120 electrical degree

60 electrical degree

90 electrical degree

45 electrical degree

Question 5 of 41

Question 6 of 41

6. 21. Which motor is preferred for domestic water pumps?

Universal Motor

Repulsion motor

Shaded pole motor

Capacitor start motor

Question 6 of 41

Question 7 of 41

7. 25. What is the reason to use a permanent capacitor in a fan motor circuit?

Lower power consumption

Splitting of phase for torque

Controlling electrical interference

Speed regulation

Question 7 of 41

Question 8 of 41

8. 30. Which type of single-phase motor is used for hard disk drives?

Repulsion motor

Reluctance motor

Hysteresis motor

Stepper motor

Question 8 of 41

Question 9 of 41

9. 7. What is the type of A.C single phase motor?

Induction start induction run motor

Capacitor start induction run motor

Capacitor start capacitor run motor

Permanent capacitor motor

Question 9 of 41

Question 10 of 41

10. 29. What is the application of a shaded pole motor?

Hair dryer

Wet grinder

Washing machine

Ceiling fan

Question 10 of 41

Question 11 of 41

11. 40. What is the effect, if some slots in a split phase motor left out without winding after completion of concentric winding?

Works normally

Runs with very high speed

Reduction in torque

Reduction in speed

Question 11 of 41

Question 12 of 41

12. 24. How to produce starting torque in a shaded pole fan motor?

Interchanging the field coil windings by switch

Interchanging cage rotor windings by switch

Using capacitor on winding circuits

Using rings on poles

Question 12 of 41

Question 13 of 41

13. 33. Where is the capacitor connected in a single-phase permanent capacitor motor?

In series with running winding

In parallel with running winding

In series with starting winding

In parallel with starting winding

Question 13 of 41

Question 14 of 41

14. 34. Which motor is used in a table fan?

Eddy current motor

Shaded pole motor

Universal motor

Permanent capacitor motor

Question 14 of 41

Question 15 of 41

15. 31. What is the function of a centrifugal switch in a capacitor start, capacitor run induction motor?

Disconnect the starting capacitor after reaching 75-80% speed

Disconnect both windings after reaching 75-80% speed

Disconnect the running winding after reaching 75-80% speed

Disconnect the starting winding after reaching 75-80% speed

Question 15 of 41

Question 16 of 41

16. 9. Which type of winding wire is used for rewinding submersible pumps?

Single cotton covered copper wire

PVC covered copper wire

Super enamelled copper wire

Double cotton covered copper wire

Question 16 of 41

Question 17 of 41

17. 37. What is the effect if the centrifugal switch is not disconnected after the motor starts?

Motor will run normally

Motor will run very slow speed

Starting winding will burn out

Motor will stop immediately

Question 17 of 41

Question 18 of 41

18. 23. What is the function of a centrifugal switch in a split-phase motor?

Protects the motor from overloading

Make and break the starting winding from supply

Maintains constant speed

Protects from overcurrent

Question 18 of 41

Question 19 of 41

19. 11. What is the function of centrifugal switch in single phase motors?

Break the running winding

Protect the motor from over loading

Maintain constant speed

Break the starting winding

Question 19 of 41

Question 20 of 41

20. 2. What is the name of single phase motor?

Capacitor start capacitor run motor

Capacitor start induction run motor

Induction start capacitor run motor

Permanent capacitor motor

Question 20 of 41

Question 21 of 41

21. 4. Which type of single phase motor is illustrated?

Universal motor

Capacitor start induction run motor

Capacitor start capacitor run motor

Permanent capacitor motor

Question 21 of 41

Question 22 of 41

22. 6. Which method is adopted to start the single phase induction motor?

Reversal of input supply terminals

Varying supply voltage method

Reversal of running coil connection

Split phase method

Question 22 of 41

Question 23 of 41

23. 14. What is the relation between running winding and starting winding of a single phase induction motor with respect to resistance?

Both resistances will be equal

Running winding is less, starting winding infinity

Running winding is less, starting winding more

Running winding is more, starting winding less

Question 23 of 41

Question 24 of 41

24. 18. Which type of single phase induction motor is used in food mixer?

Repulsion motor

Universal motor

Permanent capacitor motor

Shaded pole motor

Question 24 of 41

Question 25 of 41

25. 3. What is the working principle of split phase motor?

Faraday's laws of electrolysis

Faraday's laws of electromagnetic induction

Lenz's law

Joule's law

Question 25 of 41

Question 26 of 41

26. 12. Which is the application of universal motor?

Food mixer

Teleprinter

Compressor

Jet pump

Question 26 of 41

Question 27 of 41

27. 8. What is the purpose of the capacitor (C) in centrifugal switch speed control method of universal motor?

Improve the power factor

Protect from the over loading

Maintain constant speed

Reduce the sparks on the contacts

Question 27 of 41

Question 28 of 41

28. 39. Why a capacitor is connected across centrifugal switch in the centrifugal switch speed control method?

To protect from over loading

To improve the power factor

To maintain constant speed

To reduce the sparks in contacts

Question 28 of 41

Question 29 of 41

29. 27. Why is the running winding placed at the bottom of the core?

To get high inductance

To get low resistance

To get low inductance

To get high resistance

Question 29 of 41

Question 30 of 41

30. 41. How the radio interference can be suppressed in centrifugal switch method of speed control of universal motor?

By connecting capacitor in series with centrifugal switch

By adding compensating winding with armature

By connecting capacitor across centrifugal switch

By connecting an inductor in series with centrifugal switch

Question 30 of 41

Question 31 of 41

31. 13. Which single phase motor is fitted with wound rotor?

Repulsion motor

Shaded pole motor

Permanent capacitor motor

Capacitor start capacitor run motor

Question 31 of 41

Question 32 of 41

32. 15. What is the function of the part marked as 'x' in shaded pole motor?

Strengthen the magnetic field

Maintain constant speed

Increase the efficiency

Initiate the rotor movement

Question 32 of 41

Question 33 of 41

33. Here's the Aiken format for questions 35-41 with explanations:

Motor runs in very high speed

. What is the effect, if coil group connection is wrongly connected in a single phase motor rewinding?

Motor runs slowly

Motor runs and takes more current at no load

Motor will not run

Question 33 of 41

Question 34 of 41

34. 5. Which type of A.C single phase motor is classified under commutator motor type?

Permanent capacitor motor

Repulsion motor

Shaded pole motor

Stepper motor

Question 34 of 41

Question 35 of 41

35. 10. Which type of AC single phase motor having low starting torque?

Resistance start induction run motor

Capacitor start induction run motor

Induction start induction run motor

Capacitor start capacitor run motor

Question 35 of 41

Question 36 of 41

36. 20. Why the hysteresis motor is suitable for sound recording instruments?

Less error operation

High efficiency

Noiseless operation

Small in size

Question 36 of 41

Question 37 of 41

37. 17. Which single phase motor tapped field speed control method is employed?

Shaded pole motor

Capacitor start capacitor run motor

Universal motor

Capacitor start induction run motor

Question 37 of 41

Question 38 of 41

38. 38. How the direction of rotation of repulsion motors is to be reversed?

By shifting the brush-axis

By interchanging the supply terminals

By changing the compensating winding terminals

By changing the main winding terminals

Question 38 of 41

Question 39 of 41

39. 36. What is the effect in a repulsion motor, if the magnetic axis shifted to another side?

Motor speed will reduce from rated speed

Direction of rotation remains same

Motor speed increases from rated speed

Direction of rotation will change

Question 39 of 41

Question 40 of 41

40. 22. Which type of motor has relatively small starting torque?

Capacitor start capacitor run motor

Universal motor

Capacitor start induction run motor

Resistance start induction run motor

Question 40 of 41

Question 41 of 41

41. 1. What is the working principle of single phase induction motor?

Faraday's laws of electrolysis

Joule's law

Lenz's law

Faraday's laws of electromagnetic induction

Question 41 of 41