Usually wide and sensitive speed control is desired in case of____________?
Usually wide and sensitive speed control is desired in case of____________?
A. centrifugal pumps
B. elevators
C. steel rolling mills
D. colliery winders
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Which of the following test can be performed on DC series motor?
Which of the following test can be performed on DC series motor?
A. Swinburne test
B. Hopkinson test
C. Brake test
D. Field testThe power mentioned on the name plate of an electric motor indicates____________?
The power mentioned on the name plate of an electric motor indicates____________?
A. the power drawn in kW
B. the power drawn in kVA
C. the gross power
D. the output power available at the shaftDifferentially 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 cyclesThe condition for maximum power in case of D.C. motor is______________?
The condition for maximum power in case of D.C. motor is______________?
A. back e.m.f. = 2 x supply voltage
B. back e.m.f. = | x supply voltage
C. supply voltage = | x back e.m.f
D. supply voltage = back e.m.fIf 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 laIn 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 above