Question # 1

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

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Voltage

Current

Impedance

Reactance

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 power factor of resonant series circuit is

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1

0

-1

0.5

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

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

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

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 the pn-junction is forward biased. the current flows through it is of the order of

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mili-amperes

amperes

nano-amperes

micro-amperes

In an A.C circuit with resistor only, the current and voltage have a phase angle of

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90°

0°

180°

none of these

The Instantaneous value of alternative current maybe:

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The same as its RMS value

Greater than its Rms value

The same as its peak value

Any of these

None of these

The bridge circuit of full wave rectification uses

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one diode

two diode

three diode

four diode

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

The entire wave form of sinusoidal voltage is actually a set of all the:

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Positive maximum value + V_oand negative maximum value -V_o

Posiotive maximum value +V_oand zero

Zero and negative maximum value -V_o

Any of these

None of these

In a transistor, the central region is called

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collector

emitter

base

none of them

The wave form of alternating voltage is the graph between:

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Voltage across X-axis and time across y-axis

Current and time

Voltage along y-axis and time along x-axis

Voltage and current

Either (B) or (D)

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

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