A. series with field winding
B. series speed armature winding
C. parallel big field winding
D. parallel with armature winding
A. decrease in speed
B. increase in speed
C. short circuit
D. open circuit
A. Swinburne test
B. Hopkinson test
C. Brake test
D. Field test
A. field control method
B. armature controlled method
C. field diverter
D. frequency control method
A. is amenable to better voltage control
B. is more stable
C. has exciting current independent of load current
D. has all above features
A. all the four poles are north poles
B. alternate poles are north and south
C. all the four poles are south poles
D. two north poles follow two south poles
A. double the number of poles
B. same as the number of poles
C. half the number of poles
D. two
A. ball bearings
B. bush bearings
C. magnetic bearmgs
D. needle bearings
A. severe sparking
B. rough commutator surface
C. imperfect contact
D. any of the above