A. 4.0
B. 2.0
C. 1.0
D. 0.5
A. back e.m.f. = 2 x supply voltage
B. back e.m.f. = | x supply voltage
C. supply voltage = | x back e.m.f
D. supply voltage = back e.m.f
A. Low speed operation
B. High speed operation
C. Variable speed operation
D. Fixed speed operation
A. 2 to 3 per cent
B. 10 to 15 per cent
C. 20 to 25 per cent
D. 50 to 75 per cent
A. Series motor
B. Shunt motor
C. Cumulatively compounded motor
D. Differentially compounded motor
A. series motor only
B. shunt motor only
C. compound motor only
D. both shunt and compound motor
A. it increases the input power con-sumption
B. commutator gets damaged
C. both A. and B.
D. none of the above
A. in one direction
B. in both directions
C. below normal speed only
D. above normal speed only
A. level compounded
B. under compounded
C. cumulatively compounded
D. differentially compounded