D.C. Motors

A. full-load
B. rated r.p.m.
C. rated voltage
D. all of the above

A. eddy current losses = stray losses
B. hysteresis losses = eddy current losses
C. copper losses = 0
D. variable losses = constant losses

A. 100 W
B. 500 W
C. 1000 W
D. 1500 W

A. Hysteresis losses
B. Eddy current losses
C. Copper losses
D. Windage losses

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

A. Providing laminations in armature core
B. Providing laminations in stator
C. Using non-magnetic material for frame
D. Using material of low hysteresis co-efficient for armature core material

A. over load relay is connected in series and no volt relay in parallel with the load
B. over load relay is connected in parallel and no volt relay in series with the load
C. over load relay and no volt relay are both connected in series with the load
D. over load relay and no volt relay are both connected in parallel with the load

A. trains
B. cranes
C. hoists
D. machine tools

A. magnetic field
B. active length of the conductor
C. current flow through the conductors
D. number of conductors
E. radius of armature
F. all above factors

A. Field copper loss
B. Windage loss
C. Armature copper loss
D. None of the above