MCQ 11 MarkIn AC circuit, power is lost in only :✓resistanceBinductanceCcapacitanceDall of theseAnswerCorrect option: A. resistanceAView full question & answer→
MCQ 21 MarkMean value of alternating current in a full cycle is :AIB$\frac{I}{2}$C2I✓zeroAnswerCorrect option: D. zeroDView full question & answer→
MCQ 31 MarkThe phase difference between current and voltage in an A.C. circuit containing capacitance only is :A$0^{\circ}$✓$90^{\circ}$C$180^{\circ}$D$45^{\circ}$AnswerCorrect option: B. $90^{\circ}$BView full question & answer→
MCQ 41 MarkWhich quantity decrease in step-down transformer ?ACurrent✓VoltageCPowerDFrequencyAnswerCorrect option: B. VoltageBView full question & answer→
MCQ 51 MarkIn an alternating current circuit, the phase difference between current I and voltage is $\phi$ then the wattlen component of current will be :A$I cos \phi$B$I tan \phi$✓$I sin \phi$D$I cos \phi$AnswerCorrect option: C. $I sin \phi$CView full question & answer→
MCQ 61 MarkIn A.C. circuit, the current and voltage are given by $i=5 cos \omega t$ and $V=200 sin \omega t$ respectively. Power loss in the circuit is :A20 WB40 WC1000 W✓ZeroAnswerCorrect option: D. ZeroDView full question & answer→
MCQ 71 MarkThe relation between peack current $I_{0}$ and root mean square $I_{rms}$ is :✓$I_{0}=\sqrt{2}I_{rms}$B$I_{0}=I_{rms}$C$I_{0}=2~I_{rms}$D$I_{0}=\frac{I_{rms}}{\sqrt{2}}$AnswerCorrect option: A. $I_{0}=\sqrt{2}I_{rms}$AView full question & answer→
MCQ 81 MarkWhat value of alternating current is measured by hot wire ammeter ?AHigh valueBAverage value✓Root mean square valueDNone of theseAnswerCorrect option: C. Root mean square valueCView full question & answer→
MCQ 91 MarkIf $N_{1}$ and $N_{2}$ are number of primary and secondary coils of a step-up transformer, then :A$N_{1}>N_{2}$✓$N_{2}>N_{1}$C$N_{1}=N_{2}$D$N_{1}=0$AnswerCorrect option: B. $N_{2}>N_{1}$BView full question & answer→
MCQ 101 MarkThe power factor of L-R circuit is :A$R+\omega L$✓$R/\sqrt{(R^{2}+\omega^{2}L^{2})}$C$R.\sqrt{(R^{2}+\omega^{2}L^{2})}$D$\omega L/R$AnswerCorrect option: B. $R/\sqrt{(R^{2}+\omega^{2}L^{2})}$BView full question & answer→
MCQ 111 MarkIf the phase difference between alternating current and e.m.f. is $\phi$, then the value of power factor is :✓$cos~\phi$B$cos^{2}\phi$C$sin~\phi$D$tan\phi$AnswerCorrect option: A. $cos~\phi$AView full question & answer→
MCQ 121 MarkImpedance of L-R circuit is :A$R^{2}+\omega^{2}L^{2}$✓$\sqrt{(R^{2}+\omega^{2}L^{2})}$C$R+\omega L$D$\sqrt{R+\omega L}$AnswerCorrect option: B. $\sqrt{(R^{2}+\omega^{2}L^{2})}$BView full question & answer→
MCQ 131 MarkThe ratio of peak value and rms value of a.c. is :A2✓$\sqrt{2}$C$1/\sqrt{2}$D1/2AnswerCorrect option: B. $\sqrt{2}$BView full question & answer→
MCQ 141 MarkAn alternating electric current is represented by equation $I=0.6 sin 100 \pi t$. The frequency of alternating current is :A$50 \pi$✓50C$100 \pi$D100AnswerCorrect option: B. 50BView full question & answer→
MCQ 151 MarkThe working of dynamo is based on the principle of :Aheating effect of electric current✓electromagnetic inductionCmagnetic inductionDelectric inductionAnswerCorrect option: B. electromagnetic inductionBView full question & answer→
MCQ 161 MarkUnit of reactance is :✓ohmBteslaChenryDfaradAnswerCorrect option: A. ohmAView full question & answer→
MCQ 171 MarkThe peak value of voltage of an A.C. circuit is 440 V. Its virtual voltage is :A220 VB440 V✓$220\sqrt{2}V$D$440\sqrt{2}V$AnswerCorrect option: C. $220\sqrt{2}V$CView full question & answer→
MCQ 181 MarkIn an A.C. circuit the voltage is V, and current is I, then power loss will be :AV.IBV.I/2C$V/\sqrt{2}$✓depends upon the phase angle between V and I.AnswerCorrect option: D. depends upon the phase angle between V and I.DView full question & answer→