During rheostat braking of D.C. series motors_____________?
During rheostat braking of D.C. series motors_____________?
A. motor is run as a generator
B. motor is reversed in direction
C. motor is run at reduced speed
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D.C. shunt motors are used for driving____________?
D.C. shunt motors are used for driving____________?
A. trains
B. cranes
C. hoists
D. machine toolsThese days D.C. motors are widely used in____________?
These days D.C. motors are widely used in____________?
A. pumg sets
B. air compressors
C. electric traction
D. machine shopsWith the increase in temperature, the speed of DC series motor______________?
With the increase in temperature, the speed of DC series motor______________?
A. decreases
B. increases
C. remain same
D. none of the aboveThe speed of a D.C. shunt motor more than its full-load speed can be obtained by_____________?
The speed of a D.C. shunt motor more than its full-load speed can be obtained by_____________?
A. decreasing the field current
B. increasing the field current
C. decreasing the armature current
D. increasing the armature currentIf 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 which of the following applications D.C. series motor is invariably tried?
In which of the following applications D.C. series motor is invariably tried?
A. Starter for a car
B. Drive for a water pump
C. Fan motor
D. Motor operation in A.C. or D.C