DC Motors Quiz | DC Motors Question and Answer for Practice

31. Which D.C. motor has got maximum self loading property?

1. Series motor
2. Shunt motor
3. Cumulatively compounded motor
4. Differentially compounded motor

32. Which D.C. motor has got maximum self relieving property ?

1. Series motor
2. Shunt motor
3. Cumulatively compounded motor
4. Differentially compounded motor

33. Which D.C. motor is generally preferred for cranes and hoists ?

1. Series motor
2. Shunt motor
3. Cumulatively compounded motor
4. Differentially compounded motor

34. Which D.C. motor is preferred for elevators ?

1. Shunt motor
2. Series motor
3. Differential compound motor
4. Cumulative compound motor

35. Which D.C. motor will be preferred for machine tools ?

1. Series motor
2. Shunt motor
3. Cumulative compound motor
4. Differential compound motor

36. Which D.C. motor will be suitable alongwith flywheel for intermittent light and heavy loads?

1. Series motor
2. Shunt motor
3. Cumulatively compounded motor
4. Differentially compounded motor

37. Which method of braking is generally used in elevators ?

1. Plugging
2. Regenerative braking
3. Rheostatic braking
4. None of the above

38. Which motor has the poorest speed control?

1. Differentially compounded motor
2. Cumulatively compounded motor
3. Shunt motor
4. Series motor

39. Which motor should not be started on no-load ?

1. Series motor
2. Shunt motor
3. Cumulatively compounded motor
4. Differentially compounded motor.

40. Which of the following application requires high starting torque ?

1. Lathe machine
2. Centrifugal pump
3. Locomotive
4. Air blower

41. Which of the following law/rule can he used to determine the direction of rotation of D.C. motor ?

1. Lenzs law
2. Faradays law
3. Coloumbs law
4. Flemings left-hand rule

42. Which of the following load normally needs starting torque more than the rated torque?

1. Blowers
2. Conveyors
3. Air compressors
4. Centrifugal pumps

43. Which of the following loss in a D.C. generator is dissipated in the form of heat?

1. Mechanical loss
2. Core loss
3. Copper loss
4. All of the above

44. Which of the following loss in a D.C. generator varies significantly with the load current ?

1. Field copper loss
2. Windage loss
3. Armature copper loss
4. None of the above

45. Which of the following losses are significantly reduced by laminating the core of aD.C. generator ?

1. Hysteresis losses
2. Eddy current losses
3. Copper losses
4. Windage losses