Question # 1

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

A resonance curve for RLC series circuit is a plot of frequency versus

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Voltage

Current

Impedance

Reactance

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)

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

The highest value reached by the voltage or current:

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In quarter cycle is called Instantaneous value

In half cycle is called peak-to-peak value

In one cycle is called peak value

In half cycle is called Instantaneous value

None of these

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

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

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

During the negative half-cycle of the half-wave rectification, the diode

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does not conduct

conducts

either of these

none of these

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

When the emitter-base junction of a transistor is reverse biased, collector current

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Reverses

Increases

Decreases

Stops

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 magnitude of alternative voltage V:

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Always increase

Always decrease

Remains constant

Does not remain constant

None of these

The bridge circuit of full wave rectification uses

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one diode

two diode

three diode

four diode

In a transistor, if the central region is n-type, then this type of transistor is known as

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n-p-n transistor

p-n-p transistor

either of these

none of these

At resonance, the phase angle for RLC series resonance circuit equals

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0°

90°

180°

270°

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