Question # 1

At high frequency, the current through a capacitor is

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Small

Infinity

Zero

Large

In three phase voltage across any two lines is about.

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220 V

230 V

400 V

430 V

In an LRC circiut, the capacitance is made one-fourth, when an resonance . Then what should be change in inductance, so that the circuit remain in resonance?

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4 times

1/4 times

8 times

2 times

In LR circiut which one of the following statements is correct?

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L and R opposes each other

R value increases with frequency

The inductive reactance increases with frequency

The inductive reactance decreases with frequency

The Basic circuit element in a D.C. circuits which controls the current and voltage is

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Resistor

Inductor

Capisitor

Transistor

During each cycle A.C. voltage reaches a peak value.

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Once

Twice

Thrice

Four time

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

In purely resistive A.C circuit, instantaneous value of voltage and current:

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Current lags behind voltage

Current leads voltage by π/2

Both are in Phase

Voltage leads current by Pase θ=π/2

Direct current can not flow through.

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Inductor

Resistor

Transistor

Capacitor

The phase difference between the current and voltage at resonce is:

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0

π

-π

π/2

The effective value of any sinusoidal alternating current or voltage is

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None of the above

The most common source of an A.C. Voltage is.

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Motor

Cell

Generator

Thermo couple

An alternating quantity (voltage or current) is completely known if we know its:

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Maximum

Frequency and phase

Effective value

Both (a) & (b)

In case of capacitor, the unit of reactance is

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Farad

Ohm

Newton

All of these

The sum of positive and negative peak value called.

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R.M.S. value

P-P value

Peak value

Average value

Electro magnetic waves emitted from radio antenna are.

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Stationary

Longitudinal

Transvers

Both a and b

The mean value of A.C. in a cycle is.

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1

0

I2

Nil

The basic circuit element in A.C. circuit which controls current.

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Resistor only

Capacitor only

Inductor only

All of these

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Physics FSC Part 2 Chapter 16 Online MCQ's Test MCQs With Answers

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