D.C. generators are normally designed for maximum efficiency around_____________?
D.C. generators are normally designed for maximum efficiency around_____________?
A. full-load
B. rated r.p.m.
C. rated voltage
D. all of the above
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Which of the following motors is usually used in house-hold refrigerators ?
Which of the following motors is usually used in house-hold refrigerators ?
A. D.C. shunt motor
B. D.C. series motor
C. Single phase induction motor (split phase start or induction run motor)
D. Reluctance motor
E. Synchronous motorThe hysteresis loss in a D.C. machine least depends on____________?
The hysteresis loss in a D.C. machine least depends on____________?
A. Frequency of magnetic reversals
B. Maximum value of flux density
C. Volume and grade of iron
D. Rate of flow of ventilating airThese 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 shopsD.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the________________?
D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the________________?
A. series motor
B. shunt motor
C. compound motor
D. any of the aboveWhich D.C. motor will be preferred for machine tools ?
Which D.C. motor will be preferred for machine tools ?
A. Series motor
B. Shunt motor
C. Cumulative compound motor
D. Differential compound motorIf the load on a DC shunt motor is increases, its speed is slightly reduced due to______________?
If the load on a DC shunt motor is increases, its speed is slightly reduced due to______________?
A. increase in armature current
B. increase in flux
C. decrease in reactance
D. decrease in back emf