MHT CET 2024 11th May Morning Shift | Alternating Current Question 19 | Physics

With an alternating voltage source frequency ' f ', inductor ' $L$ ', capacitor ' $C$ ' and resistance ' $R$ ' are connected in series. The voltage leads the current by $45^{\circ}$. The value of ' $L$ ' is $\left(\tan 45^{\circ}=1\right)$

$\left(\frac{1+2 \pi \mathrm{fCR}}{4 \pi^2 \mathrm{f}^2 \mathrm{C}}\right)$

$\left(\frac{1-2 \pi f C R}{4 \pi^2 \mathrm{f}^2 \mathrm{C}}\right)$

$\left(\frac{4 \pi^2 \mathrm{f}^2 \mathrm{C}}{1+2 \pi \mathrm{fCR}}\right)$

$\left(\frac{4 \pi^2 \mathrm{f}^2 \mathrm{C}}{1-2 \pi \mathrm{fCR}}\right)$

MHT CET 2024 11th May Morning Shift

MCQ (Single Correct Answer)

-0

With gradual increase in frequency of an a.c. supply, the impedance of an LCR series circuit

increases.

decreases.

remains constant

first decreases, becomes minimum and then increases.

MHT CET 2024 10th May Evening Shift

MCQ (Single Correct Answer)

-0

An a.c. voltage source $\mathrm{V}=\mathrm{V}_0 \sin \omega \mathrm{t}$ is connected across resistance ' $R$ ' and capacitance ' $C$ ' in series. It is given that $R=\frac{1}{\omega c}$ and the peak current is $\mathrm{I}_0$. If the angular frequency of the voltage source is changed to $\left(\frac{\omega}{\sqrt{3}}\right)$, then the new peak current in the circuit is

$\frac{\mathrm{I}_0}{2}$

$\frac{\mathrm{I}_0}{\sqrt{2}}$

$ \sqrt{2} \mathrm{I}_0$

$\sqrt{3} \mathrm{I}_0$

MHT CET 2024 10th May Evening Shift

MCQ (Single Correct Answer)

-0

A transformer has 120 turns in the primary coil and carries 5 A current. Input power is one kilowatt. To have 560 V output, the number of turns in secondary coil will be

168

200

336

400

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