Explore topic-wise MCQs in Dc Machines.

This section includes 18 Mcqs, each offering curated multiple-choice questions to sharpen your Dc Machines knowledge and support exam preparation. Choose a topic below to get started.

1.

Which type motors are preferred for lathes?

A. DC shunt motors
B. Squirrel Cage induction motor
C. Synchronous motor
D. DC Shunt Motors or Squirrel cage induction motor
Answer» E.
Discussion
2.

DC shunt motor is still used instead of synchronous motor in _____________

A. High speed applications
B. Low speed applications
C. Medium and high-speed applications
D. Everywhere
Answer» C. Medium and high-speed applications
Discussion
3.

Which motor has almost replaced DC shunt motor from its applications?

A. Wound-rotor induction motor
B. Differential compound motor
C. Air motor
D. Squirrel caged induction motor
Answer» E.
Discussion
4.

WHICH_MOTOR_HAS_ALMOST_REPLACED_DC_SHUNT_MOTOR_FROM_ITS_APPLICATIONS??$

A. Wound-rotor induction motor
B. Differential compound motor
C. Air motor
D. Squirrel caged induction motor
Answer» E.
Discussion
5.

Which type motors are preferred for lathes?$

A. DC shunt motors
B. Squirrel Cage induction motor
C. Synchronous motor
D. DC Shunt Motors or Squirrel cage induction motor
Answer» E.
Discussion
6.

DC_shunt_motor_is_still_used_instead_of_synchronous_motor_in______________$

A. High speed applications
B. Low speed applications
C. Medium and high-speed applications
D. Everywhere
Answer» C. Medium and high-speed applications
Discussion
7.

For which of the following operations a DC motor is preferred over an AC motor?

A. Low speed operation
B. High speed operation
C. Variable speed operation
D. Fixed speed operation
Answer» D. Fixed speed operation
Discussion
8.

Which motor is preferred in highly explosive atmosphere?

A. Air motor
B. Shunt motor
C. Series motor
D. Battery operated motor
Answer» B. Shunt motor
Discussion
9.

Nowadays, DC motor is widely used only in ____________

A. Pumping sets
B. Air compressors
C. Electric traction
D. Machine shops
Answer» D. Machine shops
Discussion
10.

When an electric train is moving down a hill, the DC motor will operate as ____________

A. DC series motor
B. DC series generator
C. DC shunt motor
D. DC shunt generator
Answer» C. DC shunt motor
Discussion
11.

Which of the following motor can replace DC series motor?

A. DC shunt motor
B. Cumulative compound motor
C. Wound-rotor induction motor
D. Synchronous motor
Answer» D. Synchronous motor
Discussion
12.

Maximum torque in a DC machine is limited by ______________

A. Commutation
B. Heating
C. Losses other than heating
D. Stability
Answer» B. Heating
Discussion
13.

In world today, around 25% of the motors are manufactured are DC motors.

A. True
B. False
Answer» B. False
Discussion
14.

Separately excited DC generators are still used in _________________

A. Thermal power plants
B. Ward Leonard speed control system
C. Hydro power plant
D. In all fields
Answer» C. Hydro power plant
Discussion
15.

Which DC motor is used with flywheel for intermittent light and heavy loads?

A. Series motor
B. Shunt motor
C. Cumulatively compounded motor
D. Differentially compounded motor
Answer» D. Differentially compounded motor
Discussion
16.

Which of the following motors can be used to drive the rotary compressor?

A. DC shunt motor
B. DC series motor
C. Universal motor
D. Synchronous motor
Answer» E.
Discussion
17.

Which of the following load application normally needs starting torque more than the rated torque?

A. Blowers
B. Conveyors
C. Air compressors
D. Centrifugal pumps
Answer» C. Air compressors
Discussion
18.

Why are the DC motors preferred for traction applications?

A. Torque and speed are inversely proportional to armature current
B. Torque is proportional to armature current
C. Torque is proportional to square root of armature current
D. The speed is inversely proportional to the torque and the torque is proportional to square of armature current
Answer» E.
Discussion