DC Motor Technology Important MCQ - Electronic Engineering
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DC Motor Speed Controller. The DC-ECM Motor Technology offers reduced energy. MCQ’s and duration is 120 minutes. DC MOTOR !! MOST Important MCQ Questions.
- end plates
- bushes
- both (b) and (c)
- commutator
Question 1: In a DC motor, unidirectional torque is produced with the help of?
Answers: both (b) and (c)
- DC series motor
- Synchronous motor
- AC series motor
- Induction motor
Question 2: Which of the following motor has high starting torque?
Answers: DC series motor
- the load is variable
- the load is constantly decreasing
- the load bas overhauling characteristics
- the load acts as a braking force
Question 3: Regenerative braking on, shunt motors is used when?
Answers: the load acts as a braking force
- Field control
- Armature voltage control
- Mechanical loading system
- Shunt armature control
Question 4: For constant torque drive which speed control method is preferred?
Answers: Armature voltage control
- pumping sets
- air compressors
- electric traction
- machine shops
Question 5: These days D.C. motors are widely used in?
Answers: electric traction
- very low speeds
- frequent motor reversals
- wide speed range
- constant speed operation
Question 6: Ward-Leonard system of speed control is not recommended for?
Answers: constant speed operation
- Thermistor
- Thyristor
- Thyratron
- Transistor
Question 7: Which of the following can be used to control the speed of a DC motor ?
Answers: Thyristor
- AC series motor
- Induction motor
- DC series motor
- Synchronous motor
Question 8: Which of the following motor is used in the locomotives motor drives?
Answers: DC series motor
- Reluctance motor
- DC shunt motor
- Induction motor
- DC series motor
Question 9: Which of the following motors is most suitable for signalling devices and many kinds of timers?
Answers: Reluctance motor
- in order to reduce eddy current
- to reduce the use of insulating materials
- to provide large flux
- as it carries large load current
Question 10: Field winding of a DC series motor is usually provided with thick wire?
Answers: as it carries large load current
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