DC Motor or Direct Current Motor Multiple Choice Questions and Answers
6. The induced EMF in the armature conductors of a DC motor is .......
A.Sinusoidal
B.Trapezoidal
C.Rectangular
D.Alternating
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A.Sinusoidal
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7. The normal value of the armature resistance of a DC motor is.......
A.0.005
B.0.5
C.10
D.100
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8. The maximum torque of DC motors is limited by .........
A.Commutation
B.Heating
C.Speed
C.Armature current
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9. The Eb/V ratio of a DC motor is an indication of its ......
A.Efficiency
B.Speed regulation
C.Starting torque
D.Running torque
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10. Under constant load conditions, the speed of a d.c. motor is affected by .......
A.Field flux
B.Armature current
C.Back EMF
D.Both armature current and back emf
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