Question # 1

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

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

Which of the following has a great concentration of impurity

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base

emitter

collector

none of these

Which of the following diodes can operate in the reverse biased condition

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photo diode

light emitting diode

photo voltaic cell

none of these

Mathematical manipulation of the two quantized states can be best carried if they are represented by

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high - low

yes - no

on - off

0 - 1

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

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zero

small

large

very large

Alternating current can be transmitted:

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To long distance

At very high cost

At very low cost

Both (A) and (C)

Both (A) and (B)

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

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

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

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10²

10³

10⁴

10⁵

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

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A rectifier

Detector

Oscillator

An amplifier

The impedance of RLC series resonance circuit at resonant frequency is

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Greater than R

Equal to R

Less than R

None of these

When electrons in the transmitting antenna vibrate 94000 time per second, they produce radiowaves having frequency

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9.4 kHz

940 kHz

94 kHz

None of these

The phase angle of a series RLC circuit at resonance is

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180°

90°

0°

None of the these

A signal appears after amplification, at the output terminal with a phase shift of 180° , if it is applied at

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inverting input

non-inverting input

any one of the input terminal

none of them

The amplifier which us used to perform mathematical operations electronically is known as

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calculator

OP-AMP

computer

any one of them

In a transistor, the central region is called

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collector

emitter

base

none of them

The value of output resistance of OP-AMOP is of the order of

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few ohms

few hundred ohms

several kilo ohms

several mega ohms

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

Nowadays, Most of the electric energy is produced by the A.C. generators using:

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Hydal water

Geothermal energy

Solar energy

Biomass

Both (B) and (D)

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