Question # 1

In modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

In Series resonance circuit the impedance of circuit art resonance frequency, is

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Maximum

Minimum

It is unequal to R

None of above

In the capacitive circuit of A.C. quantity when q= 0 the slope of q-t curve is.

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Maximum

Minimum

Zero

Negative

An alternating voltage is given by 20 sin 157 t. Th efrequency of alternating voltage is:

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50 Hz

25Hz

100 Hz

75 Hz

The wave form of alternating voltage is a

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Cotangent curve

Cosine curve

Sine curve

Tangent curve

The peak value of alternating current is 5√2 A. The mean square value of current will be:

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5A

2.5A

5√2A

5²

X_L=

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2πfL

1/2πfL

2πfL

fL/2π

Xc =

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1/2πfc

2πfc

2π/fc

fc/2π

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

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Once

Twice

Thrice

Four time

The highest value reached by the voltage or current is one cycle is called:

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Peak to peak value

Peak value

Instantaneous value

Root mean square value

A capacitor is perfectly insulator for:

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Direct current

Alternating current

Direct as well as alternating current

None of these

The circuit which compares the two voltages is.

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LDR

Sensor

Comparator

Logic gate

If the frequency of A.C. supplied is doubled then the capacitive reactance becomes.

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Half

Two

Four times

One fourth

Vrms =

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0.7V_∘

0.07V_∘

0.007V_∘

0.75V_∘

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

The velocity of an oscillating charge as it moves to and fro along a wire is.

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Changing

Constant

Infinite

zero

The main use of A.C is

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Minimum line losses

Long distance transmission

Stepping up to required voltage only

Steeping down to required voltage only

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

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