Question # 1

The magnitude of alternative voltage V:

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Always increase

Always decrease

Remains constant

Does not remain constant

None of these

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

In free space, the speed of electromagnetic waves is

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3 x 10⁸ms^-1

3 x 10⁶ms^-1

4 x 10⁷ms^-1

3 x 10⁹ms^-1

Alternating current can induce voltage because it has a

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High peak value

Varying magnetic field

Stronger field than direct curren

Constant magnetic field

The length of rotating vector (on a certain scale) represents the:

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Peak value of alternating quantity

RMS value of alternating quantity

Instantaneous value of alternating quantity

Either (B) or (C)

Either (A) or (B)

Chock consumes externally small

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Charge

Current

Power

Potential

An A.C varies as a function of

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Current

Voltage

Time

Charge

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

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

Average value of A.C voltage during one cycle is

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1

Zero

Maximum

Variable

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

To design a resonant circuit of frequency 100 KHz with an inductor of inductance 5 mH, we need a capacitor of capacitance

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5.07 pF

50 pF

0.507 pF

507 pF

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)

The r.m.s. value of alternating current is equal to its maximum value at angle of

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60°

45°

30°

90°

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

The phase at the positive peak of an A.C. cycle is:

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0º

90º

180º

0 andᏘ

Ꮨ/2 and 3Ꮨ/2

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

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 output voltage of half wave rectification is in the form of

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a smooth curve

a smooth wave

pulses

all of the above

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

Which of the following diodes can operate in the reverse biased condition

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photo diode

light emitting diode

photo voltaic cell

none of these

The power factor of resonant series circuit is

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1

0

-1

0.5

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

During the positive half-cycle in the half-wave rectification,the diode

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does not conduct

conducts

either of these

neither of these

For the normal operation of the transistor, its

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emitter-base and collector base junctions are forward biased

emitter-base junction is reversed biased and collector base junction is forward biased

emitter-base junction is forward biased and collector-base junction is reverse biased

any one of these

The alternative voltage of current is actually measured by:

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Its RMS value

Square root of its mean square value

Instantaneous value

Peak value

Both (A) and (B)

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)

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)

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

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

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

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