DC MOTOR 3

A detailed illustration of a DC motor with labeled parts and a background of electrical diagrams and components, emphasizing the mechanics and electrical principles related to DC motor fun<wbr>ctionality.

DC Motor Mastery Quiz

Test your knowledge of DC motors with this comprehensive quiz designed for students, teachers, and anyone interested in electrical engineering concepts. Each question focuses on key principles, applications, and characteristics of DC motors.

Explore topics such as:

Back E.M.F. and Motor Speed
Field Windings and Current
Applications for Different Types of DC Motors

10 Questions2 MinutesCreated by WindingWizard512

21. When the speed of the D.C.motor increases?

Back e.m.f. Increases and current drawn decreases

Back e.m.f. As well as current drawn both increases

Back e.m.f. As well as current drawn both decreases

Back e.m.f. Decreases and current drawn increases

22. Field winding of a D.C.series motor is usually provided with thick wire ___________

To provide large flux

To reduce the use of insulating materials

As it carries large load current

In order to reduce eddy current

23. Which one of the following is not the function of pole shoes in a D.C.machine?

To reduce eddy current loss

To support the field coils

To spread out flux for better uniformity

To reduce the reluctance of the magnetic path

24. In D.C.machines the residual magnetiem is of the order of ______________

2 to 3 %

5 to 10 %

20 to 25 %

50 to 75 %

25.Which D.C.motor is generally preferred for cranes and hoists?

Series motor

Shunt motor

Cumulatively compound motor

Differentially compound motor

26. Following motor is used where high starting torque and wide speed range control is required _____________

Single phase capacitor start

Inductionor motor

Synchronous motor

D.C.Motor

27. In a differentially compounded D.C.motor, if shunt field suddenly opens __________

The motor will first stop and then run to opposite direction as series motor

The motor will work as series motor and run at slow speed in the same direction

The motor will work as series motor and run at high speed in the same direction

The motor will not work and come to stop

28, As the load is increase, the speed of D.C.shunt motor will ______________

Reduce slightly

Increase slightly

Increase proportionately

Remains unchanged

29. The armature torque of the D.C.motor is proportional to _______________

Field flux only

Armature current only

Both (a) & (b)

None of the above

30. Which of the following method of speed control of D.C.machine will offer minimum efficiency

Voltage control method

Field control method

Armature control method

All the above methods

DC MOTOR 3

DC Motor Mastery Quiz

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