Question # 1

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

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

The basic circuit elements of A.C circuit are

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Resistor

Inductor

Capacitor

All the three

The most common source of alternating voltage is:

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Motor

Transformer

AC genrator

Both (A) and (C)

Both (A) and (B)

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 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 phase at the positive peak of an A.C. cycle is:

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0º

90º

180º

0 andᏘ

Ꮨ/2 and 3Ꮨ/2

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

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0

1

low

any one of these

The value of the potential difference across the depletion region for the case of germanium is

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0.3 V

0.5 V

0.7 V

0.9 V

The closed loop gain of the non-inverting amplifier is given by

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G = R₂/R₁

G = -R₂/R₁

G = 1 - R₂/R₁

G = 1 + T₂/R₁

The waveform of alternating voltage is a:

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Square

Rectangular

Saw-tooth

Sinusoidal

None of these

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)

The wave form of alternating voltage is the graph between:

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Voltage across X-axis and time across y-axis

Current and time

Voltage along y-axis and time along x-axis

Voltage and current

Either (B) or (D)

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

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p-n-p transistor

n-p-n transistor

either of these

none of these

When the pn-junction is forward biased. the current flows through it is of the order of

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mili-amperes

amperes

nano-amperes

micro-amperes

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

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

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

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

Alternating current is produced by a voltage source which polarity:

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Remains the same

Reverse after period T

Keeps on reversing with time

Reverse after every time interval T/2

Both (C) and (D)

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

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

Conversion of alternating current into direct current is called

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amplification

rectification

conduction

polarization

The magnitude of alternative voltage V:

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Always increase

Always decrease

Remains constant

Does not remain constant

None of these

For normal operation of transistor, the batteries

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V_CCis of much lower value than V_BB

V_CCis of much higher value than V_BB

V_{CC is equal to}V_BB

none of 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

In RLC series circuit, resonance occurs when

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X_{L > Xc}

X_{L < Xc}

X_{L = Xc}

None of these

In an A.C circuit with resistor only, the current and voltage have a phase angle of

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90°

0°

180°

none of these

In half wave rectification

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both halves of the input voltage is used

only one half of the input voltage is used

either of these

none of these

Which one of the following waves belongs to electromagnetic spectrum

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Radio and TV waves

Radar waves

Micro waves

All of them

Electromagnetic waves transmit energy equal to

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1/2 mv²

m_oc²

hf/c

hf

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