A. rotary converter
B. mercury are rectifier
C. induction motor D.C. generator set
D. synchronous motor D.C. generator set
A. Insulation failure between two commutator bars
B. Insulation failure between two turns of a coil
C. Two of more turns of the same coil getting grounded
D. All of the above
A. where low voltage and high currents are involved
B. where high voltage and small cur-rents are involved
C. in both of the above cases
D. in none of the above cases
A. length of conductor
B. cross-sectional area of the conductor
C. number of conductors
D. all of the above
A. reverse the field connections
B. increase the field resistance
C. increase the speed of primemover
D. check armature insulation resistance
A. zero
B. about 2 V
C. about 50 V
D. 220 V
A. same kW rating
B. the same operation r.p.m.
C. the same droog voltage characteristics
D. same percentage regulation