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industrial drives MCQs

Practise focused industrial drives questions with marked answers for exam preparation and subject revision.

industrial drives Mcqs

1. The diameter of the rotor shaft for an electric motor depends on which of the following ?
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A. Horse power only

B. Horse power and r.p.m.

C. Horse power, r.p.m. and power factor

D. r.p.m. only

2. While selecting motor for an air conditioner which of the following characteristics is of great importance ?
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A. None of the above

B. Type of bearings

C. Type of enclosure

D. Arrangement for power transmission

E. Noise

3. The starting torque of a D.C. motor is independent of which of the following?
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A. Flux

B. Armature current

C. Speed

D. Flux and armature current

4. A reluctance motor_________________?
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A. requires starting gear

B. is provided with slip rings

C. is compact

D. has high cost

5. ___________________has least range of speed control?
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A. D.C. shunt motor

B. Schrage motor

C. Slip ring induction motor

D. Synchronous motor

6. Battery operated scooter for braking uses________________?
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A. plugging

B. mechanical braking

C. regenerative braking

D. rheostatic braking

7. The cost of an induction motor will increase as________________?
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A. horsepower rating decreases but r.p.m. increases

B. horsepower rating and operating speed increases

C. horsepower rating increases but r.p.m. decreases

D. horsepower rating and operating speed decreases

8. For a D.C. shunt motor which of the following is incorrect ?
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A. Torque varies as armature current

B. Unsuitable for heavy duty starting

C. Torque is zero for zero armature current

D. Torque-armature current is a straight line

9. Belted slip ring induction motor is almost invariably used for_________________?
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A. jaw crushers

B. centrifugal blowers

C. water pumps

D. none of the above

10. In case of _______________ speed control by injecting e.m.f. in the rotor circuit is possible?
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A. d.c. shunt motor

B. slip ring induction motor

C. schrage motor

D. synchronous motor

11. The starting torque in case of centrifugal pumps is generally_________________?
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A. less than running torque

B. slightly more than running torque

C. same as running torque

D. double the running torque

12. Which of the following motors has series characteristics ?
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A. Capacitor start motor

B. None of the above

C. Repulsion motor

D. Shaded pole motor

13. Which of the following motors is used for elevators ?
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A. Synchronous motor

B. Any of the above

C. Induction motor

D. Capacitor start single phase motor

14. The characteristics of drive for crane hoisting and lowering are which of the following ?
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A. Precise control

B. All of the above

C. Fast speed control

D. Smooth movement

15. The capacity of a crane is expressed in terms of_______________?
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A. any of the above

B. type of drive

C. span

D. tonnes

16. Heat control switches are used in__________________?
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A. three phase induction motors

B. cooling ranges

C. single phase

D. transformers

17. ________________ motor is a constant speed motor?
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A. Schrage motor

B. Universal motor

C. Induction motor

D. Synchronous motor

18. In squirrel cage induction motors which of the following methods of starting cannot be used ?
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A. Resistance in rotor circuit

B. Star-delta starting

C. Resistance in stator circuit

D. Auto-transformer starting

19. In series motor which of the following methods can be used for changing the flux per pole ?
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A. Series-parallel control

B. Diverter field control

C. Tapped field control

D. Any of the above

20. In ______________ the speed can be varied by changing the position of brushes?
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A. induction motor

B. slip ring motor

C. repulsion motor

D. schrage motor

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