Hello guys, welcome back to my blog. In this article, I will discuss dc motor MCQ or quiz, quiz questions for dc motors, or electrical interview questions related to dc motors.
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Also read – Electrical Machines Questions And Answers.
DC Motors MCQ Or Quiz
01. By seeing which part of the motor we can say this is the dc motor?
- Frame
- Shaft
- Commutator
- Stator
Ans: c
02. The application in which D.C. series motor is invariably tried?
- Starter for a car
- Drive for a water pump
- Fan motor
- Motor operation in A.C. or D.C.
Ans: a
03. Why fractional pitch winding is used in dc motor?
- to improve cooling
- to reduce copper losses
- to increase the generated e.m.f.
- to reduce the sparking
Ans: d
04. The three-point starter is most suitable for?
- shunt motors
- compound motors as well as shunt
- the compound, shunt, and series motors
- all D.C. motors
Ans: b
05. If the maximum power for a D.C. motor is established, then the efficiency of the dc motor will be?
- 100%
- around 90%
- anywhere between 75% and 90%
- less than 50%
Ans: d
06. The ratio of starting torque to full-load torque is less in which motor?
- series motors
- shunt motors
- compound motors
- none of the above
Ans: b
07. In the dc motor which part will sustain the maximum temperature increase?
- Slip rings
- Commutator
- Field winding
- Armature winding
Ans: c
08. The direction of the dc motor is determined by which law?
- Lenz’s law
- Faraday’s law
- Columb’s law
- Fleming’s left-hand rule
Ans: d
09. Which of the following needs high starting torque?
- Blowers
- Conveyors
- Air compressors
- Centrifugal pumps
Ans: b
10. In the Dc motor, the starting resistance is?
- low
- around 500 Q
- 1000 Q
- infinitely large
Ans: a
11. In dc series motor, the speed is?
- directly proportional to the armature current
- directly proportional to the square of the armature current
- directly proportional to the field current
- inversely proportional to the current of armature
Ans: d
12. If the armature current is reduced to 50% the torque of the motor will be?
- 100% of the previous value
- 50% of the previous value
- 25% of the previous value
- 10% of the previous value
- none of the above
Ans: c
13. In the dc motor, the current drawn by the armature of the motor is directly proportional to?
- the torque required
- the speed of the motor
- the voltage across the terminals
- none of the above
Ans: a
14. In dc motor, the power mention on the nameplate indicates?
- the power is drawn in kW
- the power is drawn in kVA
- the gross power
- the output power at the shaft
Ans: d
15. The motor which has got maximum self-loading property is?
- Series motor
- Shunt motor
- Cumulatively compounded ‘motor
- Differentially compounded motor
Ans: d
16. The series motor is used?
- where the constant load is required
- where frequently load changes
- where operating speed is needed constant
- none of the above
Ans: d
17. For the same full load speed and H.P. rating, the following motor which has poor starting torque?
- shunt
- series
- differentially compounded
- cumulatively compounded
Ans: c
18. The compensating winding is provided in a dc series motor is?
- which as the separately wound unit
- in parallel to the armature winding
- in series to the armature winding
- in parallel to the field winding
Ans: c
19. In the dc motor, the sparking at commutator results?
- damage to commutator segments
- damage to commutator insulation
- increased power consumption
- all of the above
Ans: d
20. If the supply voltage is increased in the dc motor, which of the following will decrease?
- Starting torque
- Operating speed
- Full-load current
- All of the above
Ans: c
Tags: DC Motors MCQ Or Quiz, Electrical Objective Questions.
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