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DC MOTOR 6

A detailed diagram of a DC motor with labeled components, showing operational flow and characteristics in an engaging style.

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

10 Questions2 MinutesCreated by EngineeringEagle234

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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