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.Management Sciences
Category: Electrical Engineering Mcqs
The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of_____________?
0
A. zero degree
B. two degrees
C. five degrees
D. ten degrees
In a circuit containing R, L and C, power loss can take place in____________?
A. C only
B. L only
C. R only
D. all above
Which motor should not be started on no-load ?
A. Series motor
B. Shunt motor
C. Cumulatively compounded motor
D. Differentially compounded motor
In A.C. series motor compensating winding is employed to_____________?
A. reduce the effects of armature reaction
B. increase the torque
C. reduce sparking at the brushes
D. none of the above
The direction of rotation of an hysteresis motor is determined by____________?
A. interchanging the supply leads
B. position of shaded pole with respect to main pole
C. retentivity of the rotor material
D. none of these
During discharge, the active material of both the positive and negative plates is changed to___________?
A. Pb
B. Pb02
C. PbO
D. PbS04
Transfer function of a system is used to calculate which of the following ?
A. The order of the system
B. The time constant
C. The output for any given input
D. The steady state gain
In thermocouples which of the following pairs is commonly used ?
A. Copper-constantan
B. Aluminium-tin
C. Silver-German silver
D. Iron-steel
When the voltage applied to a synchronous motor is increased, which of the following will reduce?
A. Stator flux
B. Pull in torque
C. Both A. and (b)
D. None of the above
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