If I2 be the armature current, then speed of a D.C. shunt motor is_______________?
If I2 be the armature current, then speed of a D.C. shunt motor is_______________?
A. independent of Ia
B. proportional to la
C. varies as (Ia)
D. varies as la
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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 aboveIn a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to
In a D.C. series motor, if the armature current is reduced by 50%, the torque of the motor will be equal to
A. 100% of the previous value
B. 50% of the previous value
C. 25% of the previous value
D. 10% of the previous value
E. none of the aboveIn a D.C. generator, the iron losses mainly take place in___________/
In a D.C. generator, the iron losses mainly take place in___________/
A. yoke
B. commutator
C. armature conductors
D. armature rotorIn a D.C. shunt motor, speed is______________?
In a D.C. shunt motor, speed is______________?
A. independent of armature current
B. directly proportional to the armature current
C. proportional to the square of the current
D. inversely proportional to the armature currentA direct on line starter is used: for starting motors___________?
A direct on line starter is used: for starting motors___________?
A. up to 5 H.P
B. up to 10 H.P
C. up to 15 H.P
D. up to 20 H.PIn a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be_____________?
In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be_____________?
A. almost negligible
B. rated full-load current
C. less than full-load current
D. more than full-load current