A. more than the normal speed
C. zero
D. loss than the normal speed
A. it starts the motor
B. it limits the speed of the motor
C. none of the above
B. Series motor
C. Differential compound motor
D. Shunt motor
A. 250 nm
B. 200 nm
C. 20 nm
A. differential compoutid D.C. motor
C. series motor
D. shunt motor
A. Shunt motor
B. Differentially compound motor
D. Cumulative compound motor
A. Prokaryotic organisms
B. Fungi
C. Eu-cariotiquic organisms
A. Differentiate compound motor
B. Shunt motor
B. Differential compound motor
C. Series motor
A. run at lower speed
C. not run
D. run at normal speed
A. Air blower
C. Lathe machine
D. Centrifugal pump
A. high starting torque
B. frequent on-off cycles
D. variable speed
B. none of the above method
C. rheostatic control
D. any of the above method
A. none of the above
C. resultant force on conductor
A. either of A. and B. above
B. None of the above
D. interchanging supply terminals
A. can be started easily without load
C. has almost constant speed
D. has a poor torque
A. the motor will continue to nuvat constant speed
B. the armature current will reduce
C. the speed of motor will be reduced %
A. back e.m.f. of these motors is zero initially
B. these motors have high starting torque
D. these motors are not self-starting
B. the speed will reduce
C. the speed will increase abruptly
D. the speed will increase in proportion to reduction in load
A. where load changes frequently
B. where constant operating speed is needed
C. where load is constant
B. high maintenance cost
C. low efficiency at Hght loads
D. high initial cost
B. none of the above
C. the field winding resistance of a DC shunt motor is increases, its speed will
D. remains same
E. decreases
B. To reduce the reluctance of the magnetic path
C. To spread out flux for better uniformity
D. To support the field coils
A. around 90%
B. anywhere between 75% and 90%
D. 100%
B. back e.m.f. of rotor is more than the applied voltage
C. back e.m.f. is less than the applied voltage
A. no-load
C. part load
D. overload
B. Hopkinson test
C. Swinburne test
D. Brake test
A. Core loss
B. Mechanical loss
D. Copper loss
B. 10% of the previous value
C. 100% of the previous value
D. 50% of the previous value
A. proportional to the armature current
B. proportional to field current
D. proportional to the square of the armature current
A. current flow through the conductors
B. radius of armature
C. magnetic field
D. active length of the conductor
F. number of conductors
A. field flux only
C. both A. and B.
D. none of the above
C. Differentially compounded motor
D. Cumulatively compounded motor
A. draw more current without producing sufficient torque
C. not develop starting torque
D. fail to start without load
A. 10 to 15 per cent
B. 20 to 25 per cent
C. 50 to 75 per cent
A. parallel big field winding
B. parallel with armature winding
C. series with field winding
A. High speed operation
B. Low speed operation
D. Fixed speed operation
B. can be used for 50C ambient temperature also
C. of higher H.P. should be selected
D. of lower H.P. should be selected
B. less than full-load current
C. almost negligible
D. rated full-load current
A. Hopkinsons test
B. Brake test
C. Swinburnes test
B. 1000 W
C. 1500 W
D. 100 W
A. Series motor
D. Battery operated motor
A. Reluctance motor
B. D.C. series motor
C. D.C. shunt motor
E. Synchronous motor
A. in one direction
C. below normal speed only
D. above normal speed only
A. mechanical losses of motor and generator together
C. all of the above
D. core losses of motor
A. Air compressors
B. Centrifugal pumps
D. Blowers
A. armature conductors
C. commutator
D. yoke
A. increasing the field current
B. increasing the armature current
D. decreasing the armature current
A. Differentially compounded motor
B. Cumulatively compounded motor
C. Shunt motor
B. remain same
D. increases
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