Category: D.C. Motors

A. zero torque braking
B. smallest torque braking
C. highest torque braking
D. none of the above

A. Frequency of magnetic reversals
B. Maximum value of flux density
C. Volume and grade of iron
D. Rate of flow of ventilating air

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

A. iron losses
B. line losses
C. sparking
D. corona losses

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

A. voltage control method
B. flux control method
C. rheostat control method
D. all of the above

A. Swinburne’s test
B. Hopkinson’s test
C. Field test
D. Brake test

A. Lathe machine
B. Centrifugal pump
C. Locomotive
D. Air blower

A. D.C. shunt motor
B. D.C. series motor
C. Single phase induction motor (split phase start or induction run motor)
D. Reluctance motor
E. Synchronous motor

A. damage to commutator segments
B. damage to commutator insulation
C. increased power consumption
D. all of the above