An induction motor with 1000 r.p.m. speed will have____________?
An induction motor with 1000 r.p.m. speed will have____________?
A. 8 poles
B. 6 poles
C. 4 poles
D. 2 poles
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Lubricant used for ball bearing is usually___________?
Lubricant used for ball bearing is usually___________?A. graphite
B. grease
C. mineral oil
D. molassesIn a three-phase induction motor__________?
In a three-phase induction motor__________?A. power factor at starting is high as compared to that while running
B. power factor at starting is low as compared to that while running
C. power factor at starting in the same as that while runningThe torque of a rotor in an induction motor under running condition is maximum__________?
The torque of a rotor in an induction motor under running condition is maximum__________?A. at the unit value of slip
B. at the zero value of slip
C. at the value of the slip which makes rotor reactance per phase equal to the resistance per phase
D. at the value of the slip which makes the rotor reactance half of the rotorThe speed of a squirrel-cage induction motor can be controlled by all of the following except_____________?
The speed of a squirrel-cage induction motor can be controlled by all of the following except_____________?A. changing supply frequency
B. changing number of poles
C. changing winding resistance
D. reducing supply voltageInsertion of resistance in the stator of an induction motor___________?
Insertion of resistance in the stator of an induction motor___________?A. increases the load torque
B. decreases the starting torque
C. increases the starting torque
D. none of the aboveIn Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be___________?
In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be___________?A. Ns
B. s.N,
C. (l-s)Ns
D. (Ns-l)s