Free Printable ac

Worksheets

ac

Total questions: 15

Worksheet time: 9mins

Name

Class

Date

In a series, LCR-circuit, resonant frequency will be

L/C

$\sqrt{LC}$

$\frac{1}{\sqrt{LC}}$

$\sqrt{\frac{L}{C}}$

If an AC voltage is applied to an LCR circuit, which of the following is true?

I and V are out of phase with each other in R.

I and V are in phase in L while in C, they are out of phase.

I and V are out of phase in both C and L.

I and V are out of phase in L and in phase in C.

The peak value of ac voltage on a 220 V mains is

$200\sqrt{2}$

$220\sqrt{2}$

$\frac{220}{\sqrt{2}}$

220

Series ac circuit has inductance L, resistance R and angular frequency to, the quality factor Q is

$\left(\frac{\omega L}{R^{ }}\right)^2$

$\frac{\omega L}{R}$

$\frac{R}{\omega L}$

$\left(\frac{R}{\omega L}\right)^2$

Choose the correct statement.

In a dc circuit the inductor can conduct but not a capacitor.

In dc circuit both the inductor and capacitor cannot conduct.

The inductor has infinite resistance in a dc circuit.

In a dc circuit capacitor has zero resistance

The reactance of a capacitor C is Xc. If both the frequency and capacitance be doubled, then new reactance will be

2Xc

4Xc

$\frac{Xc}{4}$

Average power generated in an inductor connected to an a.c. source is

$\frac{1}{2\ }LI^2$

Zero

None of these

The power factor varies between

2 and 2.5

3.5 to 5

1 to 2

0 to 1

The phase relationship between current and voltage in a pure resistive circuit is best represented by

10.

Which of the following graphs represents the correct variation of inductive reactance XL with frequency u?

11.

In which of the following circuits the maximum power dissipation is observed?

Pure capacitive circuit

Pure resistive circuit

Pure inductive circuit

None of these

12.

At resonance frequency the impedance in series LCR circuit is

minimum

maximum

infinity

zero

13.

An AC voltage source of variable angular frequency ω and fixed amplitude Vm is connected in series with a capacitance C and an electric bulb of resistance R (inductance zero). When ω is increased then,

The bulb glows dimmer

Total impedance of the circuit increases

No change

The bulb glows brighter

14.

To reduce the resonant frequency in an LCR series circuit with a generator

dielectric in the capacitor should be removed.

the iron core of the inductor should be removed.

the generator frequency should be reduced.

another capacitor should be added in parallel to the first.

15.

In an alternating current circuit consisting of elements in series, the current increases on increasing the frequency of supply. Which of the following elements are likely to constitute the circuit?

only resistor

resistor and an inductor

only inductor

resistor and a capacitor

100 %

ac

Total questions: 15

Worksheet time: 9mins

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