Industrial Drivers(Electrical Engineering ) Questions and Answers

Question 1. Rotor of a motor is usually supported on _________ bearings.
  1.    Ball or roller
  2.    Needle
  3.    Bush
  4.    Thrust
Explanation:-
Answer: Option A. -> Ball or roller
Question 2. For derris and winches which of the following drives can be used?
  1.    Pole changing squirrel cage motors
  2.    D.C. motors with Ward-Leonard control
  3.    A.C. slip ring motors with variable resistance
  4.    Any of the above
Explanation:-
Answer: Option D. -> Any of the above
Question 3. Which of the following motors is preferred for traction work?
  1.    Universal motor
  2.    D.C. series motor
  3.    Synchronous motor
  4.    Three-phase induction motor
Explanation:-
Answer: Option B. -> D.C. series motor
Question 4. When the load is above _________ a synchronous motor is found to be more economical.
  1.    2 kW
  2.    20 kW
  3.    50 kW
  4.    100 kW
Explanation:-
Answer: Option D. -> 100 kW
Question 5. Belted slip ring induction motor is almost invariably used for
  1.    Water pumps
  2.    Jaw crushers
  3.    Centrifugal blowers
  4.    None of the above
Explanation:-
Answer: Option B. -> Jaw crushers
Question 6. Which feature, while selecting a motor for centrifugal pump, will be of least significance?
  1.    Starting characteristics
  2.    Operating speed
  3.    Horse power
  4.    Speed control
Explanation:-
Answer: Option D. -> Speed control
Question 7. Which of the following motors is preferred when quick speed reversal is the main consideration?
  1.    Squirrel cage induction motor
  2.    Wound rotor induction motor
  3.    Synchronous motor
  4.    D.C. motor
Explanation:-
Answer: Option D. -> D.C. motor
Question 8. ________ need frequent starting and stopping of electric motors,
  1.    Paper mills
  2.    Grinding mills
  3.    Air-conditioners
  4.    Lifts and hoists
Explanation:-
Answer: Option D. -> Lifts and hoists
Question 9. For blowers which of the following motor is preferred?
  1.    D.C. series motor
  2.    D.C. shunt motor
  3.    Squirrel cage induction motor
  4.    Wound rotor induction motor
Explanation:-
Answer: Option B. -> D.C. shunt motor
Question 10. While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance?
  1.    Running characteristics
  2.    Starting characteristics
  3.    Efficiency
  4.    Braking
Explanation:-
Answer: Option D. -> Braking
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