Sparking, is discouraged in a D.C. motor because_____________?
Sparking, is discouraged in a D.C. motor because_____________?
A. it increases the input power con-sumption
B. commutator gets damaged
C. both A. and B.
D. none of the above
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Ward Leonard method of speed control is basically a______________?
Ward Leonard method of speed control is basically a______________?
A. field control method
B. armature controlled method
C. field diverter
D. frequency control methodThe armature torque of the D.C. shunt motor is proportional to____________?
The armature torque of the D.C. shunt motor is proportional to____________?
A. field flux only
B. armature current only
C. both A. and B.
D. none of the aboveWard-Leonard control is basically a____________?
Ward-Leonard control is basically a____________?
A. voltage control method
B. field divertor method
C. field control method
D. armature resistance control methodWhich of the following application requires high starting torque ?
Which of the following application requires high starting torque ?
A. Lathe machine
B. Centrifugal pump
C. Locomotive
D. Air blowerWhere D.C. motor of H.P. 12 or more requires frequent starting, stopping, reversing and speed control______________?
Where D.C. motor of H.P. 12 or more requires frequent starting, stopg, reversing and speed control______________?
A. drum type controller is used
B. three point starter is used
C. four point starter is used
D. all above can be usedWhich D.C. motor is generally preferred for cranes and hoists ?
Which D.C. motor is generally preferred for cranes and hoists ?
A. Series motor
B. Shunt motor
C. Cumulatively compounded motor
D. Differentially compounded motor