Electronic DC Motor MCQ Interview - Electronic Engineering
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DC Motor Questions · 1. What will happen if the DC shunt motor is linked across the AC supply? 2. If the back EMF of a DC motor is wiped out suddenly.
- regenerative
- dynamic braking
- plugging
- none of the above
Question 1: If the terminals of armature of DC motor are interchanged, this action will offer following kind of braking?
Answers: plugging
- All of the above
- Shunt motors
- Series motors
- Compound motors
Question 2: For which types of DC motor, dynamic braking is generally used?
Answers: All of the above
- increasing the armature current
- decreasing the armature current
- increasing the excitation current
- reducing the field current
Question 3: The speed of a DC shunt motor is required to be more. than full load speed. This is possible by?
Answers: reducing the field current
- running torque of the motor
- efficiency of the motor
- speed regulation of the motor
- starting torque of the motor
Question 4: In a DC motor, the ratio E¡/V4 indicates?
Answers: efficiency of the motor
- Better speed control
- Wide speed range
- Low cost
- High starting torque
Question 5: Which of the following is not necessarily the advantage of DC motors over AC motors ?
Answers: Low cost
- none of the above
- demagnetise the field partially
- limit the armature current
- control the flux
Question 6: The function of a field regulator for compound motors is to ?
Answers: control the flux
- the load is variable
- the load has overhauling characteristics
- the load also acts as a braking force
- the load is constantly decreasing
Question 7: Regenerative braking on DC shunt motors is used when?
Answers: the load has overhauling characteristics
- Running down test
- Brake test
- Swinburne's test
- Field test
Question 8: Which of the following tests can be used to determine no-load losses in a D.C. shunt motor ?
Answers: Swinburne's test
- line losses
- iron losses
- sparking
- corona losses
Question 9: DC generators are installed near the load centres to reduce?
Answers: line losses
- change in armature current of the D.C. motor
- change in the field excitation of the DC motor
- change in supply voltage
- change in armature voltage of DC motor
Question 10: In Ward Leonard method of speed control of a DC motor, change in speed of motor is obtained by the?
Answers: change in armature voltage of DC motor
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Correct: 0 Wrong: 0
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