D.C. Motors MCQs

A. run at normal speed

B. not run

C. run at lower speed

D. burn due to heat produced in the field winding by .eddy currents

A. decreasing the field current

B. increasing the field current

C. decreasing the armature current

D. increasing the armature current

A. the speed will increase abruptly

B. the speed will increase in proportion to reduction in load

C. the speed will remain almost/constant

D. the speed will reduce

A. the speed of motor will be reduced %

B. the armature current will reduce

C. the motor will attain dangerously high speed 1

D. the motor will continue to nuvat constant speed

A. shunt motor

B. series motor

C. differential compoutid D.C. motor

D. cumulative compound D.C. motor

A. it limits the speed of the motor

B. it limits the starting current to a safe value

C. it starts the motor

D. none of the above

A. has its field winding consisting of thick wire and less turns

B. has a poor torque

C. can be started easily without load

D. has almost constant speed

A. field control method

B. armature controlled method

C. field diverter

D. frequency control method

A. more than the normal speed

B. loss than the normal speed

C. normal speed

D. zero

A. Ward Leonard control

B. rheostatic control

C. any of the above method

D. none of the above method