D.C. Motors

A. the motor will first stop and then run in opposite direction as series motor
B. the motor will work as series motor and run at slow speed in the same direction
C. the motor will work as series motor and run at high speed in the same direction
D. the motor will not work and come to stop

A. Single phase capacitor start
B. Induction motor
C. Synchronous motor
D. D.C. motor
E. None of the above

A. level compounded
B. under compounded
C. cumulatively compounded
D. differentially compounded

A. in one direction
B. in both directions
C. below normal speed only
D. above normal speed only

A. it increases the input power con-sumption
B. commutator gets damaged
C. both A. and B.
D. none of the above

A. series motor only
B. shunt motor only
C. compound motor only
D. both shunt and compound motor

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

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. Low speed operation
B. High speed operation
C. Variable speed operation
D. Fixed speed operation

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