D.C. Motors

A. independent of armature current
B. directly proportional to the armature current
C. proportional to the square of the current
D. inversely proportional to the armature current

A. decreasing the field current
B. increasing the field current
C. decreasing the armature current
D. increasing the armature current

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

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. 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. 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. these motors have high starting torque
B. these motors are not self-starting
C. back e.m.f. of these motors is zero initially
D. to restrict armature current as there is no back e.m.f. while starting