DC Motor Electronic Engineering question & answer - Electronic Engineering
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DC Motor Electronic Engineering Multiple Choice questions / objective type questions, MCQs with question and answers.
- the field
- the brushes
- the armature
- the commutator
Question 1: ln the DC Motor the iron losses occur in ?
Answers: the armature
- all of the above
- high initial cost
- low efficiency at light loads
- high maintenance cost
Question 2: The main disadvantage of the Ward Leonard control method is?
Answers: all of the above
- the friction losses
- the copper losses
- the eddy current losses
- the stray losses
Question 3: The retardation test is applicable to shunt motors and generators and is used to find?
Answers: the stray losses
- machine tools
- cranes and hoists
- shear and punches
- none of the above
Question 4: A series motor is best suited for driving?
Answers: cranes and hoists
- DC shunt motor
- DC shunt generator
- DC series generator
- DC series motor
Question 5: When the electric train is moving down a hill the DC motor act as?
Answers: DC series generator
- Shunt motor
- Differential compound
- Cumulative compound
- Series motor
Question 6: Which of the following motors, on removal of load, will run at the highest speed?
Answers: Series motor
- decrease
- Increase
- remain same
- become zero
Question 7: If the speed of a DC shunt motor is increased, the back EMF of the motor will?
Answers: Increase
- armature conductors
- yoke
- armature rotor
- commutator
Question 8: In a DC generator, the iron losses mainly take place in?
Answers: armature rotor
- Low cost
- Wide speed range
- High starting torque
- Stability
Question 9: Which one of the following is not necessarily the advantage of DC motors over AC Motors?
Answers: Low cost
- brush off carbon deposits on the commutator
- prevent overheating of armature windings
- prevent sparking during commutation
- provide a path for flow of current
Question 10: In electric motors carbon brushes are used to?
Answers: provide a path for flow of current
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