DC Motors Question with Answer


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

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

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

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

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

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

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

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

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

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

46. Which of the following method of speed control of D.C. machine will offer minimum efficiency ?

  1. Armature control method
  2. All above methods
  3. Voltage control method
  4. Field control method

47. Which of the following motor has the poorest speed regulation ?

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

48. Which of the following motor is preferred for operation in highly explosive atmosphere ?

  1. Air motor
  2. Battery operated motor
  3. Series motor
  4. Shunt motor

49. Which of the following motors is most suitable for signalling devices and many kinds of timers ?

  1. Induction motor
  2. Reluctance motor
  3. D.C. shunt motor
  4. D.C. series motor

50. Which of the following motors is usually used in house-hold refrigerators ?

  1. Single phase induction motor (split phase start or induction run motor)
  2. Reluctance motor
  3. D.C. shunt motor
  4. D.C. series motor

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