D.C. shunt motors are used for driving____________?
D.C. shunt motors are used for driving____________?
A. trains
B. cranes
C. hoists
D. machine tools
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For which types of D.C. motor, dynamic braking is generally used ?
For which types of D.C. motor, dynamic braking is generally used ?
A. Shunt motors
B. Series motors
C. Compound motors
D. All of the aboveTo get the speed of D.C, motor below the normal without wastage of electrical energy is used?
To get the speed of D.C, motor below the normal without wastage of electrical energy is used?
A. Ward Leonard control
B. rheostatic control
C. any of the above method
D. none of the above methodWhere 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 usedThe 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 aboveWhen the armature of a D.C. motor rotates, e.m.f. induced is___________?
When the armature of a D.C. motor rotates, e.m.f. induced is___________?
A. self-induced e.m.f.
B. mutually induced e.m.f.
C. back e.m.f
D. none of the aboveFor the same H.P. rating and full load speed, following motor has poor starting torque_____________?
For the same H.P. rating and full load speed, following motor has poor starting torque_____________?
A. shunt
B. series
C. differentially compounded
D. cumulativelyc’ompounded