DC MOTOR 3
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
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
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