MCQ
Power factor is maximum in an $L C R$ circuit when
- ✓$X_L=X_C$
- B$R=0$
- C$X_L=0$
- D$X_C=0$
✓
Answer
Correct option: A.
$X_L=X_C$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A battery of e.m.f. $10 \quad V$ and internal resistance $0.5 ohm$ is connected across a variable resistance $R$. The value of $R$ for which the power delivered in it is maximum is given by
→One conducting $U$ tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field $B$ is perpendicular to the plane of the figure. If each tube moves towards the other at a constant sped $v$ then the emf induced in the circuit in terms of $B, l$ and $v$ where $l$ is the width of each tube, will be
→A cord is used to lower vertically a block of mass $\mathcal{M}$ by a distance $d$ with constant downward acceleration $\frac{g}{4}$. Work done by the cord on the block is
→Which of the following graph represents uniform motion
The energy stored in wound watch spring is
A short sighted person can see distinctly only those objects which lie between $10 \mathrm{~cm}$ and $100 \mathrm{~cm}$ from him. The power of the spectacle lens required to see a distant object is
→Doppler effect is applicable for
The kinetic energy of a body of mass $3 \mathrm{~kg}$ and momentum $2 \mathrm{Ns}$ is
→When an ac source of e.m.f. $e=E_0 \sin (100 t)$ is connected across a circuit, the phase difference between the e.m.f. $e$ and the current $i$ in the circuit is observed to be $\pi / 4$, as shown in the diagram. If the circuit consists possibly only of $R C$ or $L C$ in series, find the relationship between the two elements
→
A wire of $9.8 \times 10^{-3} \mathrm{kgm}^{-1}$ passes over a frictionless light pulley fixed on the top of a frictionless inclined plane which makes an angle of $30^{\circ}$ with the horizontal. Masses $m$ and $M$ are tied at the two ends of wire such that $m$ rests on the plane and $M$ hangs freely vertically downwards. The entire system is in equilibrium and a transverse wave propagates along the wire with a velocity of $100 \mathrm{~ms}$. Chose the correct option
→