Question # 1

At high frequency, the current through a capacitor is

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Small

Infinity

Zero

Large

In frequency modulation which factor changed.

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Amplitude of charge carriers

Frequency of charge carriers

Amplitude of signal

Frequency of signal

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

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Resistor

Inductor

Capisitor

Transistor

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

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0

π

-π

π/2

The inductive reactance of a coil is direction proportional to.

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Inductance

Resistance

Frequency of A.C.

Both frequency of A.C. and inductance

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)

The natural frequency of L.C circuit is equal to

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The unit of impedance is.

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Henry

Hertz

Ampere

Ohm

In frequency modulation, the amplitude of carrier waves is

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Increases

Remains constant

Decreases

None of these

The flow of D.C current is opposed by

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Resistor

Induction

Capacitor

All of these

The unit of impedance is

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Farad

Henry

Tesla

Ohm

In modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

In A.C circuit of inductor which one is true

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Voltage leads current by phase angle π/2

Voltage lags current by π/2

Current leads voltage by π/2

Both remain in phase

The reactance is the ratio of

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V_rms/I_rms

V_rms x I_rms

I_rms/V_rms

V_max x V_rms

X_L=

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2πfL

1/2πfL

2πfL

fL/2π

An in cudutor may store energy in

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Its magnetic field

Its coil

Its electric field

A neighboring circuit

In case of capacitor, the unit of reactance is

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Farad

Ohm

Newton

All of these

Unit of impedance is:

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Ohm

Ohm^-1

no unit

Ohm m^-1

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