Which 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
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In 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 aboveWhich of the following motor is preferred for operation in highly explosive atmosphere ?
Which of the following motor is preferred for operation in highly explosive atmosphere ?
A. Series motor
B. Shunt motor
C. Air motor
D. Battery operated 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 aboveThe speed of a D.C. series motor is_____________?
The speed of a D.C. series motor is_____________?
A. proportional to the armature current
B. proportional to the square of the armature current
C. proportional to field current
D. inversely proportional to the armature currentIn case of conductively compensated D.C. series motors, the compensating winding is provided______________?
In case of conductively compensated D.C. series motors, the compensating winding is provided______________?
A. as separately wound unit
B. in parallel with armature winding
C. in series with armature winding
D. in parallel with field windingThe size of poxvirus is_______________?
The size of poxvirus is_______________?A. 20 nm
B. 200 nm
C. 250 nm
D. 300 nm