DC Motor Speed Control MCQs : This section focuses on the "DC Motor Speed Control". These Multiple Choice Questions (MCQs) should be practiced to improve the DC Motor Speed Control skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
By series armature resistance method, we can get _________________________
A. Speed above rated speed
B. Speed equal to rated speed
C. Speed below rated speed
D. All speeds are possible
Question 2
By series parallel method of armature control how many different speeds are possible?
A. 4
B. 8
C. 2
D. Infinite
Question 3
Consider the armature control method, where 10 Ω resistance is connected in series with armature in first case. For second case resistance value is changed 100 Ω. Then ____________
A. Speed-torque characteristic of both will start from same point
B. For first case speed-torque characteristic will start below to the case 2
C. For first case speed-torque characteristic will start above to the case 2
D. Can’t say because other parameters are unavailable
Question 4
Flux density distribution is distorted by armature control method.
A. TRUE
B. FALSE
Question 5
For constant torque drive which of the following speed control method is preferred?
A. Field control
B. Armature voltage control
C. Shunt armature control
D. Voltage control
Question 6
For which speed control method we get minimum efficiency?
A. Voltage control method
B. Field control method
C. Armature control method
D. Cannot be determined
Question 7
In rheostatic series control method of armature we add ____________
A. Variable resistor in parallel with armature
B. Variable resistor in series with armature
C. Fixed resistor in parallel with armature
D. Fixed resistor in series with armature
Question 8
In shunted rheostatic armature control method ______________
A. Variable resistor is added in parallel with armature
B. Variable resistor is added in series with armature
C. Variable resistor is added in parallel with armature and another variable resistor is added in series
D. Variable resistor is not added in whole circuit
Question 9
Speed regulation of armature series control method is __________
A. Very good
B. Zero
C. Poor
D. Cannot comment
Question 10
The speed of a DC motor can be varied by changing ______________
A. Field current
B. Applied voltage
C. Resistance in series with armature
D. Field current, applied voltage or resistance in series with armature any method will work
Question 11
Which method is best for series traction motors?
A. Rheostatic armature control
B. Shunted armature control
C. Series parallel control method
D. Any method can be employed
Question 12
Which of the following is correct statement?
A. Speed regulation of rheostatic armature control method is better than that of shunted armature control
B. Speed regulation of rheostatic armature control method is worse than that of shunted armature control
C. Speed regulation of rheostatic armature control method is almost equal to that of shunted armature control
D. Speed regulation of rheostatic armature control method and of shunted armature control are equally worst.
Question 13
Which of the following method is used for DC motor with 12+ HP requiring frequent start, stop, speed reversal?
A. Drum type controller is used
B. Three-point starter is used
C. Four-point starter is used
D. Cannot be determined