Armature reaction in dc motor results___________?
Armature reaction in dc motor results___________?
A. decrease in speed
B. increase in speed
C. short circuit
D. open circuit
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Which of the following load normally needs starting torque more than the rated torque?
Which of the following load normally needs starting torque more than the rated torque?
A. Blowers
B. Conveyors
C. Air compressors
D. Centrifugal pumpsWhich D.C. motor will be preferred for machine tools ?
Which D.C. motor will be preferred for machine tools ?
A. Series motor
B. Shunt motor
C. Cumulative compound motor
D. Differential compound motorSparking, 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 aboveIn Ward-Leonard control the lower limit of speed is imposed by________?
In Ward-Leonard control the lower limit of speed is imposed by________?
A. residual magnetism of the generator
B. core losses of motor
C. mechanical losses of motor and generator together
D. all of the aboveIf the field of a D.C. shunt motor gets opened while motor is running______________?
If the field of a D.C. shunt motor gets opened while motor is running______________?
A. the speed of motor will be reduced %
B. the armature current will reduce
C. the motor will attain dangerously high speed 1
D. the motor will continue to nuvat constant speedWhich of the following motors one will choose to drive the rotary compressor ?
Which of the following motors one will choose to drive the rotary compressor ?
A. D.C. shunt motor
B. D.C. series motor
C. Universal motor
D. Synchronous motor