Category: D.C. Motors

A. high starting torque
B. low starting torque
C. variable speed
D. frequent on-off cycles

A. Mechanical loss
B. Core loss
C. Copper loss
D. All of the above

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

A. Series motor
B. Shunt motor
C. Cumulatively compounded motor
D. Differentially compounded motor

A. Starting torque
B. Operating speed
C. Full-load current
D. All of the above

A. back e.m.f. is equal to armature drop
B. armature drop is negligible
C. flux is proportional to armature current
D. flux is practically constant in D:C. shunt motors

A. dc generator
B. dc motor
C. transformer
D. all of the above

A. Ward Leonard control
B. rheostatic control
C. any of the above method
D. none of the above method

A. the torque required
B. the speed of the motor
C. the voltage across the terminals
D. none of the above

A. To reduce eddy current loss
B. To support the field coils
C. To spread out flux for better uniformity
D. To reduce the reluctance of the magnetic path