Shunt - D.C Motor - MCQs with Answers

Shunt - D.C Motor - MCQs with Answers

Q1. D.C. shunt motor is also called as

a. Constant flux motor
b. Constant voltage motor
c. Variable voltage motor
d. Constant current motor

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Q2. The torque developed in d.c. shunt motor is

a. Directly proportional to the armature current
b. Directly proportional to the square of the armature current
c. Inversely proportional to the armature current
d. Inversely proportional to the square of armature current

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Q3. For a constant torque load, if the armature resistance of shunt motor is doubled (keeping the shunt field constant) then the armature current will become

a. Double
b. Halved
c. Remains same
d. None of these

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Q4. A 4 pole, 220 V, 10 H.P, d.c. shunt motor is rotating at a speed of 320 rpm. Then the developed useful torque is

a. 210.647 N-m
b. 215.547 N-m
c. 219.484 N-m
d. None of these

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Q5. If a shunt motor is started with its field winding open then

a. It will rotate at the same speed as that with its field winding closed
b. It will rotate at less speed as that with its field winding closed
c. It will rotate at dangerously high speed
d. None of these

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Q6. D.C. shunt motors are commonly used in

a. Cranes
b. Electric traction
c. Elevators
d. Lathe machines

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