DC MOTOR 4
Master Your DC Motor Knowledge
Test your understanding of DC motors with our engaging quiz! Dive into various aspects of DC motors, including their operation, advantages, and characteristics. Perfect for both students and professionals in the electrical engineering field.
In this quiz, you will:
- Explore key concepts and terminology related to DC motors.
- Assess your ability to solve practical problems.
- Enhance your knowledge and understanding of motor speed and torque.
31. As there is no back e.m.f., at the instant of starting a D.C.motor, in order to prevent a heavy current from flowing through the armature circuit __________
A resistance is connected in series with armature
A resistance is connected parallel to the armature
Armature is temporarily open circuited
A high value resistor is connected across the field winding
32. The speed of a D.C.shunt motor can be increased by ___________
Increasing the resistance in armature circuit
Increasing the resistance in field circuit
Reducing the resistance in the field circuit
Reducing the resistance in the armature circuit
33. In case the back e.m.f., and the speed of a D.C.motor are doubled, the torque developed by the motor will _____________
Remains unchanged
Reduces to one-fourth value
Increase four folds
Be doubled
34. The speed of the D.C.motor can be varied by varying __________
Field current
Applied voltage
Resistance in series with armature
Any of the above
35. Which one of the following is not necessarily the advantage of D.C.motors over A.C. motors?
Low cost
Wide speed range
Stability
High starting torque
36. For a D.C.shunt motor if the excitation is changed ___________
Torque will remain constant
Torque will change but power will remain constant
Torque and power both will change
Torque, power and speed, all will change
37. If the speed of a D.C.shunt motor is increased, the back e.m.f., of the motor will ______
Increase
Decrease
Remain same
Become zero
38. Why are the D.C.motors preferred for traction applications?
Torque and speed are inversely proportional to armature current
Torque is proportional to armature current
Torque is proportional to square root of armature current
The speed is inversely proportional to the torque and the torque is proportional to square of armature current
39. Which motor should not be started on no-load?
Series motor
Shunt motor
Cumulatively compounded motor
Differentially compounded motor
40. For constant torque drive which speed control method is preferred?
Field control
Armature voltage control
Shunt armature control
Mechanical loading system
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