DC MOTOR 6
DC Motor Mastery Quiz
Test your knowledge of DC motors with our engaging quiz designed for both students and professionals! With a series of well-crafted questions, you'll delve into the mechanics, operation, and characteristics of DC generators and motors.
- Multiple-choice questions to challenge your understanding
- Focus on practical applications and theoretical concepts
- Perfect for electrical engineering enthusiasts
51. Which of the following loss in a D.C.generator is dissipated in the form of heat?
Mechanical loss
Copper loss
Core loss
All of the above
52. In a D.C. generator, the iron losses mainly take place in ___________
Yoke
Commutator
Armature conductor
Armature rotor
53. When the armature of a D.C.motor rotates, e.m.f., induced is ____________
Self induced emf
Mutually induced emf
Back emf
None of the above
54. The speed of the D.C.shunt motor is required to be more than full load speed.This is possible by _______________-
Reducing the field current
Decreasing the armature current
Increasing the armature current
Increasing the excitation current
55. The speed of a series motor at no load is _____________
Infinity
4000 rpm
2000 rpm
1000 rpm
56. What will happen if supply terminals of D.C.shunt motor are interchanged?
The direction of rotation will reverse
The motor will stop
Motor will run at speed lower than the normal speed in the same direction
Motor will run at its normal speed in the same direction as it was running
57. A series motor is started without load. The effect is that ____________
The back e.m.f.decreases
The torque increases rapidly
The speed increases rapidly
The current drawn increases rapidly
58. A D.C.shunt motor is rotating in clock-wise direction as viewed from one end. The polarity of connection of the armature and field winding are reversed simultaneously. The motor will ____________
Rotate in clockwise direction
Rotate in anti-clockwise direction
Will not rotate at all
Gain excessively high speed
59. If the no-voltage release of a D.C.motor starter fails to work on resumption of supply after a break, the motor will ___________
Will not start automatically
Start automatically without trouble
Get damaged
Develop very low torque
60. Which of the following motors, on removal of load, will run at the highest speed?
Shunt motor
Series motor
Differential compound
Cumulative compound
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