Lubricant used for ball bearing is usually___________?
Lubricant used for ball bearing is usually___________?
A. graphite
B. grease
C. mineral oil
D. molasses
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In an induction motor if air-gap is increased__________?
In an induction motor if air-gap is increased__________?A. the power factor will be low
B. windage losses will be more
C. bearing friction will reduce
D. copper loss will reduce In an induction motorThe circle diagram for an induction motor cannot be used to determine____________?
The circle diagram for an induction motor cannot be used to determine____________?A. efficiency
B. power factor
C. frequency
D. outputThe speed characteristics of an induction motor closely resemble the speedload characteristics of which of the following machines?
The speed characteristics of an induction motor closely resemble the speedload characteristics of which of the following machines?A. D.C. series motor
B. D.C. shunt motor
C. universal motor
D. none of the aboveThe ‘cogging’ of an induction motor can be avoided by____________?
The ‘cogging’ of an induction motor can be avoided by____________?A. proper ventilation
B. using DOL starter
C. auto-transformer starter
D. having number of rotor slots more or less than the number of stator slots (not equal)An induction motor can run at synchronous speed when____________?
An induction motor can run at synchronous speed when____________?A. it is run on load
B. it is run in reverse direction
C. it is run on voltage higher than the rated voltage
D. e.m.f. is injected in the rotor circuitIn case the air gap in an induction motor is increased?
In case the air gap in an induction motor is increased?A. the magnetising current of the rotor will decrease
B. the power factor will decrease
C. speed of motor will increase
D. the windage losses will increase