When 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 above
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Which motor should not be started on no-load ?
Which motor should not be started on no-load ?
A. Series motor
B. Shunt motor
C. Cumulatively compounded motor
D. Differentially compounded motorTo 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 methodFollowing motor is used where high starting torque and wide speed range control is required?
Following motor is used where high starting torque and wide speed range control is required?
A. Single phase capacitor start
B. Induction motor
C. Synchronous motor
D. D.C. motor
E. None of the aboveWhich 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 motorDifferentially compound D.C. motors can find applications requiring___________?
Differentially compound D.C. motors can find applications requiring___________?
A. high starting torque
B. low starting torque
C. variable speed
D. frequent on-off cyclesD.C. generators are installed near the load centres to reduce_____________?
D.C. generators are installed near the load centres to reduce_____________?
A. iron losses
B. line losses
C. sparking
D. corona losses