Electrical Engineering MCQs

Page No. 217

A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to_________?


athe big size of the inductor


b the reactance of the inductor


cthe current flowing in the inductor


d the statement given is false



The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of____________?''


airon loss in core


b skin effect


c increase in temperature


dcapacitive effect between adjacent coil turns


View Answer iron loss in core

The ratio of active power to apparent power is known as factor__________?


ademand


bload


cpower


d form


View Answer power

The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is_________?


a4 kVAR


b 6 kVAR


c8 kVAR


d16 kVAR


View Answer 6 kVAR

A parallel AC. circuit in resonance will__________?


ahave a high voltage developed across each inductive and capacitive section


bhave a high impedance


c act like a resistor of low value


dhave current in each section equal to the line current


View Answer have a high impedance

In AC. circuits, laminated iron is invariably used in order to__________?


areduce eddy current loss


bincrease heat radiation


cmake assembly cheap and easier


d reduce circuit permeability



All definitions of power factor of a series R-L-C circuit are correct except__________?


aratio of net reactance and impedance


b ratio of kW and kVA


cratio of J and Z


dratio of W and VA



The purpose of a parallel circuit resonance is to magnify________?


a current


b voltage


cpower


d frequency


View Answer voltage

Wire-wound resistors are unsuitable for use at high frequencies because they_______?


acreate more electrical noise


b are likely to melt under excessive eddy current heat


cconsume more power


d exhibit unwanted inductive and capacitive effects



Which of the following statements pertains to resistors only _____________?


acan dissipate considerable amount of power


bcan act as energy storage devices


cconnecting them in parallel in¬creases the total value


d oppose sudden changes in voltage



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