Question # 1

At resonance frequency the impedance of parallel resonance circuit is

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Maximum

Minimum

Zero

None of the above

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

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

The average of A.C. current and voltage over a complete cycle is

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Maximum

zero

Neither zero nor maximum

None of these

The waveform of alternating voltage is a:

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Square

Rectangular

Saw-tooth

Sinusoidal

None of these

At resonance, the impedance of RLC series circuit is

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Maximum

Zero

Minimum

Determinate

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

In frequency modulation (FM), the carrier waves amplitude

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Remains constant

Increase

Decreases

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

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 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

Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:

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Peak value

RMS value

Instantaneous value

Peak-to-peak value

Both (A) and (C0

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

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tens

hundreds

thousands

ten thousands

An A.C varies as a function of

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Current

Voltage

Time

Charge

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

OP-AMP has the following input terminals

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one

two

three

four

SI unit of impedance is

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hertz

henry

ampere

ohms

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

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

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

Electromagnetic waves transmit energy equal to

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1/2 mv²

m_oc²

hf/c

hf

During each cycle, alternating voltage reaches a peak value

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One time

Two times

Four times

A number of times depending on the frequency

The bridge circuit of full wave rectification uses

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one diode

two diode

three diode

four diode

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

If we connected the ordinary DC ammeter to measure alternating current, it would measure its:

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Instantaneous value

RMS value

Value averaged over a cycle

Either (B) or (C)

Either (A) or (C)

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

Conversion of alternating current into direct current is called

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amplification

rectification

conduction

polarization

Which one of the following Electro-magnetic wave have the highest frequency and shortest wave-length

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X-rays

Ultraviolet rays

y-rays

Cosmic rays

Most OP-AMP operates with

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+ 6 V supply

+ 10 V supply

+ 12 V supply

+ 24 V supply

If we connect a A.C. volt meter to read A.C. voltage, It would read its:

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RMS value

Instantaneous value

Valued average over a cycle

Zero

Both (B) and (C)

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