Multiple choice questions on dc motor # 7


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objectives of electrical engineering on dc motor 7



1) A dc shunt motor is supplying a load at its rated speed. The speed can be reduced by
A) armature circuit resistance control
B) field resistance control
C) Ward leonard control
D) any of the above

Ans:A

2) Which of the following dc motors has almost constant speed over their full load range?
A) shunt
B) series
C) cumulative compound
D) None of these

Ans:A

3) A motor used for punching machine is usually subjected to
A) full load continuously
B) part of full load continuously
C) no load
D) intermittent load

Ans:D

4) The speed of a dc motor depends upon
A) flux per pole
B) applied voltage to armature
C) voltage drop in armature circuit resistance
D) all of the above

Ans:D

5) The resistance of the field regulator of a dc shunt motor is of the order of
A) 100
B) 10
C) 2
D) 0.5

Ans:A

6) The most inefficient method for speed control of dc motors is
A) voltage control
B) field control
C) armature control

Ans:C

7)  Which of the following dc motors has got maximum self relieving property?
A) shunt
B) series
C) cumulative compound
D) differential compound

Ans:B

8) Which motor should not be used for centrifugal pumps?
A) shunt
B) series
C) cumulative compound
D) differential compound

Ans:B

9) A dc series motor is best suited for driving
A) line shafting, blowers and fans
B) machine tools
C) shear and punches
D) cranes and hoists
E) none of these

Ans:D

10) A dc shunt motor is driving a constant torque load. On inserting an additional resistance in the armature circuit, the speed of the motor will
A) remain unchanged
B) increase
C) decrease
D) be zero

Ans:C

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