Question # 1

The most common source of alternating voltage is:

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Motor

Transformer

AC genrator

Both (A) and (C)

Both (A) and (B)

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. 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

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

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

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

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photo diode

light emitting diode

photo voltaic cell

none of these

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

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

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)

At resonance frequency the impedance of parallel resonance circuit is

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Maximum

Minimum

Zero

None of the above

In RLC series circuit, resonance occurs when

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X_{L > Xc}

X_{L < Xc}

X_{L = Xc}

None of these

Most OP-AMP operates with

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+ 6 V supply

+ 10 V supply

+ 12 V supply

+ 24 V supply

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 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

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

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

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