Question # 1

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

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

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A rectifier

Detector

Oscillator

An amplifier

The device which allows only the flow of an A.C. through a circuit is

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Capacitor

Inductor

D.C. motor

Battery

The bridge circuit of full wave rectification uses

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one diode

two diode

three diode

four diode

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 varies as a function of

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Current

Voltage

Time

Charge

The r.m.s. value of alternating current is equal to its maximum value at angle of

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60°

45°

30°

90°

In series RC circuit when R=X_c, then the phase angle is

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0°

90°

70°

45°

For the normal operation of the transistor, its

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emitter-base and collector base junctions are forward biased

emitter-base junction is reversed biased and collector base junction is forward biased

emitter-base junction is forward biased and collector-base junction is reverse biased

any one 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

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

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photo diode

light emitting diode

photo voltaic cell

all of them

The R₁= infinity and R₂= 0, then the gain of non-inverting amplifier is

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zero

infinity

one

any one of these

In n-p-n transistor, emitter base junction is kept

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reversed

forward biased

may be reversed or may be forward biased

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

Transmitting antenna emits

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Magnetic waves

Electric waves

Electromagnetic waves

Sound waves

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

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0°

90°

180°

270°

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