Industrial Drives(Electrical Engineering Questions ) Questions and Answers

Question 1. 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
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2. The travelling speed of cranes varies from_________________?
  1.    20 to 30 m/s
  2.    10 to 15 m/s
  3.    5 to 10 m/s
  4.    1 to 2.5 m/s
Explanation:-
Answer: Option D. -> 1 to 2.5 m/s
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 3. The cost of an induction motor will increase as________________?
  1.    horsepower rating increases but r.p.m. decreases
  2.    horsepower rating decreases but r.p.m. increases
  3.    horsepower rating and operating speed increases
  4.    horsepower rating and operating speed decreases
Explanation:-
Answer: Option A. -> horsepower rating increases but r.p.m. decreases
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 4. Which of the following motors has series characteristics ?
  1.    Shaded pole motor
  2.    Repulsion motor
  3.    Capacitor start motor
  4.    None of the above
Explanation:-
Answer: Option B. -> Repulsion motor
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 5. While selecting motor for an air conditioner which of the following characteristics is of great importance ?
  1.    Type of bearings
  2.    Type of enclosure
  3.    Noise
  4.    Arrangement for power transmis¬sion
  5.    None of the above
Explanation:-
Answer: Option C. -> Noise
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 6. Which of the following alternatives will be cheaper ?
  1.    A 100 H.P. AC. three phase motor
  2.    Four motors of 25 H.P. each
  3.    Five motors of 20 H.P. each
  4.    Ten motors of 10 H.P. each
Explanation:-
Answer: Option A. -> A 100 H.P. AC. three phase motor
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 7. For a D.C. shunt motor which of the following is incorrect ?
  1.    Unsuitable for heavy duty starting
  2.    Torque varies as armature current
  3.    Torque-armature current is a straight line
  4.    Torque is zero for zero armature current
Explanation:-
Answer: Option A. -> Unsuitable for heavy duty starting
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 8. Which of the following types of motor enclosure is safest ?
  1.    Totally enclosed
  2.    Totally enclosed fan cooled
  3.    Open type
  4.    Semi closed
Explanation:-
Answer: Option B. -> Totally enclosed fan cooled
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 9. In series motor which of the following methods can be used for changing the flux per pole ?
  1.    Tapped field control
  2.    Diverter field control
  3.    Series-parallel control
  4.    Any of the above
Explanation:-
Answer: Option D. -> Any of the above
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 10. The diameter of the rotor shaft for an electric motor depends on which of the following ?
  1.    r.p.m. only
  2.    Horse power only
  3.    Horse power and r.p.m.
  4.    Horse power, r.p.m. and power factor
Explanation:-
Answer: Option C. -> Horse power and r.p.m.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
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