Question # 1

Which of the following diode is used for the detection of light

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photo diode

light emitting diode

photo voltaic cell

all of them

In RLC series circuit, resonance occurs when

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X_{L > Xc}

X_{L < Xc}

X_{L = Xc}

None of these

Most OP-AMP operates with

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+ 6 V supply

+ 10 V supply

+ 12 V supply

+ 24 V supply

In a normally biased n-p-n transistor, an electron c current I_Eflows from the

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emitter into the base

collector into the base

base into collector

none of these

At resonance, the impedance of RLC series circuit is

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Maximum

Zero

Minimum

Determinate

The bridge circuit of full wave rectification uses

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one diode

two diode

three diode

four diode

For a n-p-n transistor, the conventional current equation can be written as

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I_E+ I_C= I_B

I_C- I_B= I_E

I_C+ I_B= I_E

I_B+ I_E= I_C

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

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5.07 pF

50 pF

0.507 pF

507 pF

A changing magnetic flux creates around itself

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An electromotive force

An electric field (changing electric flux)

Magnetic field

None of the above

The basic circuit element in A.C. circuits are:

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Resistor and capacitor

Resistor and Inductor

Capacitor only

Both (B) and (C)

None of these

In a transistor, if the central region is n-type, then this type of transistor is known as

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n-p-n transistor

p-n-p transistor

either of these

none of these

A signal is amplified at the output without any change of phase, if it is applied at the

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inverting input

non-inverting input

at any of the input

none of these

The value of current gain of n-p-n transistor is of the order of

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tens

hundreds

thousands

ten thousands

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

The input resistance of the OP-AMP is the resistance between the

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(-) input and output

(+) input and output

(-) and (+) inputs

between any inputs

In free space, the speed of electromagnetic waves is

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3 x 10⁸ms^-1

3 x 10⁶ms^-1

4 x 10⁷ms^-1

3 x 10⁹ms^-1

In describing functions of digital systems, a closed switch will be shown as

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0

1

low

any one of these

During the negative half-cycle of the half-wave rectification, the diode

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does not conduct

conducts

either of these

none of these

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

The open loop gain of OP-AMP is of the order of

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10²

10³

10⁴

10⁵

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