Electrical Engineering MCQs

Page No. 65

If an inductance is connected in one arm of bridge and resistances in the remaining three arms____________?


athe bridge can always be balanced


bthe bridge cannot be balanced


cthe bridge can be balanced if the resistances have some specific values


d None of the above



If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is_________________?


a10°


b 80°


c120°


d170°


View Answer 10°

The two pressure coils of a single phase power factor meter have_________________?


athe same dimensions and the same number of turns


bthe same dimension but different number of turns


cthe same number of turns but different dimensions


dnone of the above



In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of_________________?


a 0.1 Hz


b0.25 Hz


c 0.5 Hz


d1.5 Hz


View Answer 0.5 Hz

The power factor of a single phase load can be calculated if the instruments available are_____________?


aone voltmeter and one ammeter


bone voltmeter, one ammeter and one wattmeter


c one voltmeter, one ammeter and one energy meter


d any of the above



A Weston synchronoscope is a________________?


amoving coil instrument


bmoving iron instrument


cdynamometer instrument


dnone of the above



In a Weston synchronoscope, the fixed coils are connected across_______________?


a bus-bars


bincoming alternatorincoming alternator


ca lamp


dnone of the above


View Answer incoming alternator

In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at_____________?


a


b 60°


c90°


d 120°


View Answer 120°

In a Weston frequency meter, the magnetic axes of the two fixed coils are__________________?


aparallel


bperpendicular


cinclined at 60°


d inclined at 120°


View Answer perpendicular

In a single phase power factor meter the phase difference between the currents in the two pressure coils is___________________?


a exactly 0°


bapproximately 0°


c exactly 90°


dapproximately 90°


View Answer exactly 90°

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