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.Management Sciences
Category: Electrical Engineering Mcqs
Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is_________________?
A. approximately equal to one
B. less than one
C. great than one
D. none of the above
The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to______________?
A. lubricate the contacts
B. insulate the contacts from switch body
C. extinguish the arc
D. all of the above
E. none of the above
The Zener current will be minimum when_____________?
A. Load current is maximum
B. Load current is minimum
C. Load current is zero
D. None of the above
In D.C. generators the polarity of the interpoles_____________?
A. is the same as that of the main pole ahead
B. is the same as that of the immediately preceding pole
C. is opposite to that of the main pole ahead
D. is neutral as these poles do not play part in generating e.m.f.
For testing appliances, the wattage of test lamp should be_____________?
A. very low
B. low
C. high
D. any value
For blowers which of the following motor is preferred ?
A. D.C. series motor
B. D.C. shunt motor
C. Squirrel cage induction motor
D. Wound rotor induction motor
Which type of winding is used in 3 phase shell-type transformer?
A. Circular type
B. Sandwich type
C. Cylindrical type
D. Rectangular type
Hartley oscillator is commonly used in______________?
A. Radio receivers
B. Radio transmitters
C. TV receivers
D. None of the above
_______________method can bring the locomotive to dead stop?
A. Plugging braking
B. Rheostatic braking
C. Regenerative braking
D. None of the above
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