Question # 1

The phase angle of a series RLC circuit at resonance is

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180°

90°

0°

None of the these

When the pn-junction is in reversed biased, current flows through the junction due to the

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majority carriers

minority carriers

either of them

none of them

The bridge circuit of full wave rectification uses

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one diode

two diode

three diode

four diode

Conversion of alternating current into direct current is called

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amplification

rectification

conduction

polarization

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 value of output resistance of OP-AMOP is of the order of

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few ohms

few hundred ohms

several kilo ohms

several mega ohms

For a n-p-n transistor, the conventional current equation can be written as

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I_E+ I_C= I_B

I_C- I_B= I_E

I_C+ I_B= I_E

I_B+ I_E= I_C

When the p-n junction is forward biased its resistance is of the order of

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few mega ohms

few kilo ohms

few ohms

few milli ohms

The total reactance of a series RLC circuit at resonance is

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zero

Equal to the resistance

Infinity

Capacitive

At resonance, the impedance of RLC series circuit is

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Maximum

Zero

Minimum

Determinate

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

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0

1

low

any one of these

When either L or C is increased, the resonant frequency of the RLC series circuit

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Increases

Decreases

Remains the same

Becomes zero

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 R₁= infinity and R₂= 0, then the gain of non-inverting amplifier is

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zero

infinity

one

any one of these

The basic circuit element in D.C. circuit is:

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A capacitor

A resistor

An inductor

Both (A) and (C)

Both (A) and (B)

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

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

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)

A P-N juction or semiconductor diode cannot be used as

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A rectifier

Detector

Oscillator

An amplifier

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

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