Electrical Engineering MCQs

Page No. 66

A power factor meter has________________?


aone current circuit and two pressure circuits


b one current circuit and one pressure circuit


ctwo current circuits and one pres¬sure circuit


dnone of the above



To avoid the effect of stray magnetic field in A.C. bridges we can use_______________?


a magnetic screening


bWagner earthing device


cwave filters


d any of the above


View Answer magnetic screening

For measurement of mutual inductance we can use________________?


a Anderson bridge


bMaxwell’s bridge


cHeaviside bridge


dAny of the above


View Answer Heaviside bridge

In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be_____________?


aout of phase by 90°


b out of phase by 60°


cout of phase by 30°


d out of phase by 0°


View Answer out of phase by 90°

Wagner earthing device is used to eliminate errors due to________________?


aelectrostatic coupling


belectromagnetic coupling


cboth A. and B.


dnone of the above



For measurement of inductance having high value, we should use______________?


aMaxwell’s bridge


bMaxwell Wein bridge


cHay’s bridge


d Any of the above


View Answer Hay’s bridge

A universal RLC bridge uses_________________?


aMaxwell bridge configuration for measurement of inductance and De Santas bridge for measurement of capacitance


bMaxwell Wein bridge for measurement of inductance and modified De Santy’s bridge for measurement of capacitance


cMaxwell Wein bridge for measurement of inductance and Wein bridge for measurement of capacitance


dAny of the above



In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be_______________?


aunity


b0.5


c0.3


dzero


View Answer 0.5

To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken_______________?


afrom a source which is not the same as the unknown voltage


b from a battery


cfrom the same source as the unknown voltage


dany of the above



A phase shifting transformer is used in conjunction with_______________?


a D.C. potentiometer


bDrysdale potentiometer


cA.C. co-ordinate potentiometer


dCrompton potentiometer



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