Question # 1

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

At resonance, the impedance of RLC series circuit is

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Maximum

Zero

Minimum

Determinate

At higher frequency of the alternating current, the capacitive reactance X_c

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Increases

Decreases

Remains the same

Increases only when the voltage increases

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

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tens

hundreds

thousands

ten thousands

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 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

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

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0°

90°

70°

45°

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

The power factor of resonant series circuit is

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1

0

-1

0.5

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

A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from

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2nd group

fourth group

fifth group

sixth group

An A.C. voltage is applied across the inductor. When the frequency of the voltage is increased, the current

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Decreases

Increases

Does not change

Momentarily goes to zero

Electromagnetic waves transmit energy equal to

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1/2 mv²

m_oc²

hf/c

hf

If 250V is the RMS value of alternative voltage, then its peak value V_owill be:

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353.5V

250V

175V

zero

400V

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

Chock consumes externally small

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Charge

Current

Power

Potential

OP-AMP has the following input terminals

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one

two

three

four

The most common source of alternating voltage is:

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Motor

Transformer

AC genrator

Both (A) and (C)

Both (A) and (B)

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

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