Question # 1

The RMS value of alternating current is:

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0.7 times at the peak value

0.5 times the peak value

0.7 times the Instantaneous value

Equal to maximum voltage

None of these

If 250V is the RMS value of alternative voltage, then its peak value V_owill be:

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353.5V

250V

175V

zero

400V

A P-N juction or semiconductor diode cannot be used as

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A rectifier

Detector

Oscillator

An amplifier

The value of the input resistance of OP-AMP is of the order of

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few ohms

few hundred ohms

several kilo ohms

several maga ohms

The basic circuit elements of A.C circuit are

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Resistor

Inductor

Capacitor

All the three

A sinusoidally alternating voltage or current can be graphically represented by a:

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Vector

Rotating vector

Clockwise vector

Anticlockwise voltage vector

None of these

If the value of C in a series RLC circuit is increased, the resonant frequency

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Is not affected

Increase

Remains the same

Decreases

The basic circuit element in D.C. circuit is:

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A capacitor

A resistor

An inductor

Both (A) and (C)

Both (A) and (B)

The circuit which is used to smooth the output voltage of the full-wave rectification is known as

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transformer

rectifier

filter

none of these

A digital system deals with quantities or variables which have

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only one state

only two discrete states

three discrete states

four discrete states

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

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3525.0 volts

35.35 volts

353.5 volts

3.535 volts

The output voltage of half wave rectification is in the form of

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a smooth curve

a smooth wave

pulses

all of the above

In a transistor, the central region is called

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collector

emitter

base

none of them

The emitter-base junction of a transistor is forward-biased and collector-base junction is reverse-biased. If the base current is increased, its

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I_cwill decrease

V_CEwill increase

I_Cwill increase

V_CCwill increase

When a transistor is used as a switch the circuit in which the current is to be switched OFF and ON, is connected between the

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base and emitter

collector and emitter

base and collector

any one of these

An A.C varies as a function of

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Current

Voltage

Time

Charge

When the pn-junction is connected reversed biased, its resistance is of the order of

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few ohms

few kilo-ohms

few mega-ohms

few mili-ohms

When the p-n junction is forward biased its resistance is of the order of

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few mega ohms

few kilo ohms

few ohms

few milli ohms

In which of the following components, pn-junction is used

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light emitting diode

photo diode

photo voltaic cell

all of these

At resonance, the phase angle for RLC series resonance circuit equals

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0°

90°

180°

270°

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