Question # 1

OP-AMP has the following input terminals

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one

two

three

four

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

Most OP-AMP operates with

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+ 6 V supply

+ 10 V supply

+ 12 V supply

+ 24 V supply

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

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0°

90°

70°

45°

Electromagnetic waves transmit energy equal to

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1/2 mv²

m_oc²

hf/c

hf

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

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3525.0 volts

35.35 volts

353.5 volts

3.535 volts

At resonance, the impedance of RLC series circuit is

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Maximum

Zero

Minimum

Determinate

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

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

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10²

10³

10⁴

10⁵

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

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 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

Transmitting antenna emits

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Magnetic waves

Electric waves

Electromagnetic waves

Sound waves

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)

The total reactance of a series RLC circuit at resonance is

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zero

Equal to the resistance

Infinity

Capacitive

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

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 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

At resonance frequency the impedance of parallel resonance circuit is

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Maximum

Minimum

Zero

None of the above

An A.C varies as a function of

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Current

Voltage

Time

Charge

The time interval during which the Voltage source changes its polarity once is known as:

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Time period T

Half the time period

Quarter the time period

Two third of the time period

None of these

The value of the input resistance of OP-AMP is of the order of

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few ohms

few hundred ohms

several kilo ohms

several maga ohms

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

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 which of the following components, pn-junction is used

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light emitting diode

photo diode

photo voltaic cell

all of these

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

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0

1

low

any one of these

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)

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 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 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

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