Interview Questions for DC Motor - Electronic Engineering
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Electronic Engineering MCQs Interview questions and answers (objective type, multiple choice). The device converts electrical energy into mechanical energy.
- 1:10
- 1:8
- 1:4
- 1:6
Question 1: The series parallel system of speed control of DC series motors widely used in traction work gives a speed range of about?
Answers: 1:4
- increase
- decrease
- remain same
- become zero
Question 2: If the speed of a DC shunt motor is increased the back EMF of the motor will?
Answers: increase
- it increases the input power consumption
- none of the above
- both (a) and (b)
- commutator gets damaged
Question 3: Sparking is discouraged in a DC motor because?
Answers: commutator gets damaged
- Series motor
- Differentially compounded motor
- Shunt motor
- Cumulatively compounded motor
Question 4: Which DC motor bas got maximum self loading property?
Answers: Differentially compounded motor
- 4000 RPM
- 2000 RPM
- infinity
- 1000 RPM
Question 5: The speed of a series motor at no load is?
Answers: infinity
- 20 to 25 per cent
- 50 to 75 per cent
- 10 to 15 per cent
- 2 to 3 per cent
Question 6: In DC machines the residual magnetism is of the order of?
Answers: 2 to 3 per cent
- It cannot be used where high starting torque is required
- It should be directly connected to the load
- It is a constant speed motor
- It may run away if its field becomes open
Question 7: Which of the following statements is correct, in case of a DC series motor?
Answers: It should be directly connected to the load
- nothing will happen to the motor
- this will make armature to take heavy current, possibly burning it
- this will result in excessive speed, possibly" destroying armature due to excessive centrifugal stresses
- motor will run at very "slow speed
Question 8: If a DC shunt motor is working at no load and if shunt field circuit suddenly opens?
Answers: this will result in excessive speed, possibly" destroying armature due to excessive centrifugal stresses
- Series motor
- Shunt motor
- Cumulative compound motor
- Separately excited motor
Question 9: Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque?
Answers: Series motor
- Series motor
- Shunt motor
- Differential compound motor
- Cumulative compound motor
Question 10: A shearing machine has cyclic load consisting of intermittent light and henry loads. Which of the following DC motor will be suitable for this purpose?
Answers: Cumulative compound motor
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Total Questions Attempted: 0
Correct: 0 Wrong: 0
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