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.Management Sciences
Category: Electrical Engineering Mcqs
A laminated iron core has reduced eddy-current losses because____________?
A. more wire can be used with less D.C. resistance in coil
B. the laminations are insulated from each other
C. the magnetic flux is concentrated in the air gap of the core
D. the laminations are stacked vertfcally
If the diversity factor of a power station is high then its generation cost is___________?
A. high
B. low
C. remain same
D. depend on the plan type
The efficiency of a plant is of least concern when it is selected as___________?
A. peak load plant
B. casual run plant
C. either A. or (b)
D. base load plant
Two holes in the disc of energy meter are drilled at the opposite sides of the spindle to_____________?
A. improve its ventilation
B. eliminate creeping at no load
C. increase its deflecting torque
D. increase its braking torque
Dynamic equalising circuit is useful____________?
A. To limit di / dt of SCR
B. To limit dV / dt of SCR
C. For voltage equalisation
D. Both B and C
What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart ?
A. 22 x 10″8 N
B. 22 x 10″7 N
C. 22 x 10-6 N
D. 22 x 10″5 N
If the percentage impedances of the two transformers working in parallel are different, then______________________?
A. transformers will be overheated
B. power factors of both the transformers will be same
C. parallel operation will be not possible
D. parallel operation will still be possible, but the power factors at which the two transformers operate will be different from the power factor of the common load
A crack in the magnetic path of an inductor will result in________________?
A. unchanged inductance
B. increased inductance
C. zero inductance
D. reduced inductance
The strength of a semiconductor crystal comes from______________?
A. Forces between nuclei
B. Forces between protons
C. Electron-pair bonds
D. None of the above
Which of the following resistances can be measured by conducting insulation resistance test on a synchronous motor ?
A. Phase to phase winding resistance
B. Stator winding to earthed frame
C. Rotor winding to earthed shaft
D. All of the above
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