Free Printable Quiz on Basic E for BSc Students

1.

To work as a Amplifier, the transistor has to be operated in

a)

Cut off region

b)

Saturation region

c)

Active region

d)

All of the above

2.

The device shown here is

a)

PN junction diode

b)

Varacter diode

c)

Zener diode

d)

Schottky diode

3.

In CB configuration, the value of α is

a)

$\frac{I_C}{I_E}$

b)

$\frac{I_E}{I_B}$

c)

$\frac{I_B}{I_C}$

d)

$\frac{I_E}{I_C}$

4.

The efficiency of a centre-tapped full wave rectifier is;

a)

50%

b)

46%

c)

70%

d)

81.2%

5.

Addition of pentavalent impurity to a semiconductor creates _____.

a)

Free Electrons

b)

Holes

c)

Valence Electrons

d)

Valence Ion

6.

In transistors conduction occurs due to the flow of

a)

Minority charge carriers

b)

Majority charge carriers

c)

Both majority and minority charge carriers

7.

The base region of a transistor is doped:

a)

Heavily

b)

Moderately

c)

Lightly

d)

None of the above

8.

The net charge of an N-type semiconductor is

a)

Negative

b)

Zero

c)

Positive

d)

Dependent

9.

If base current is 100µA and current gain is 100, then collector current is

a)

A. 1A

b)

B. 10A

c)

C. 1mA

d)

D. 10mA

10.

Relation between Alpha and Beta is

a)

$\alpha=1+\beta$

b)

$\beta=\alpha-1$

c)

$\beta=\frac{\alpha}{1-\alpha}$

d)

$\alpha=\frac{\beta}{1-\beta}$

11.

The number of holes in an intrinsic semiconductor is

a)

Equal to number of free electrons

b)

Greater than number of free electrons

c)

Less than number of free electrons

d)

None of the above

12.

$V_{dc}$ in halfwave rectifier

a)

$\frac{V_m}{2}$

b)

$\frac{V_m}{\sqrt[]{2}}$

c)

$\frac{V_m}{\pi}$

d)

$\frac{V_m}{\sqrt[]{\pi}}$

13.

Load regulation is given by;

a)

$\frac{V_{NL}-V_{FL}}{V_{FL}}\times100\%$

b)

$\frac{V_{FL}-V_{NL}}{V_{FL}}\times100\%$

c)

$\frac{V_{NL}-V_{FL}}{V_{NL}}\times100\%$

d)

$\frac{V_{FL}-V_{NL}}{V_{N.L}}\times100\%$

14.

A semiconductor in its purest form is called.......

a)

Extrinsic semiconductor

b)

Superconductor

c)

Intrinsic semiconductor

d)

Insulator

15.

What is the resistance of this resistor?

a)

2200 ohm

b)

1000 ohm

c)

2.4K ohm

d)

100K ohm

16.

A circuit which produces a continuous, repeated, alternating waveform without any input

a)

CLIPPER

b)

AMPLIFIER

c)

OSCILLATOR

d)

CLAMPER

17.

The maximum amount of reverse voltage which can be applied on a diode before breakdown is reached

a)

Zener Voltage

b)

Peak Inverse Voltage

c)

Breakdown Voltage

d)

Threshold Voltage

18.

A circuit which removes any one portion of an input voltage is called

a)

Clamper

b)

Clipper

c)

Level shifter

d)

Doubler

19.

The depletion layer of a PN junction diode has

a)

Only free mobile holes

b)

Only free mobile electrons

c)

Both free mobile holes as well as electrons

d)

Neither free mobile electrons nor holes

20.

Assuming a germanium diode in this figure, the voltage of point A is ______ volt.

a)

0

b)

0.3

c)

0.7

d)

6

21.

The color of light emitted by a LED depends on

a)

its forward bias

b)

its reverse bias

c)

the amount of forward current

d)

the type of semiconductor material used

22.

The main use of an emitter follower is as

a)

power amplifier

b)

impedance matching device

c)

low-input impedance circuit

d)

follower of base signal

23.

The voltage gain of an emitter follower is

a)

more than its current gain

b)

greater than or equal to unity

c)

less than or equal to unity

d)

dependent on emitter load

24.

If Barkhausen criterion is not fulfilled by an oscillator circuit, it will

a)

stop oscillating

b)

produce damped waves continuously

c)

become an amplifier

d)

produce high frequency whistles

25.

An ideal regulated power supply is one which has voltage regulation of …………

a)

0%

b)

50%

c)

100%

d)

1%

26.

The ripple factor of a capacitor filter ......., when the capacitance value increases

a)

increases

b)

decreases

c)

may increase or decrease

d)

doesn't change

27.

The Q point in a voltage amplifier is selected in the middle of the active region because

a)

It gives better stability

b)

the circuit needs a small dc voltage

c)

It gives a distortion less output

28.

Operating point represents

a)

Values of I_C and V_CE when signal is applied

b)

the magnitude of signal

c)

Zero signal values of I_C and V_CE

d)

None of the above

29.

Voltage gain in dB is defined as

a)

$20\ \log_{10}\ \frac{V_o}{V_{in}}$

b)

$10\ \log_{10}\ \frac{V_o}{V_{in}}$

c)

$20\ \ln\ \frac{V_0}{V_{in}}$

d)

$10\ \ln\ \frac{V_o}{V_{in}}$

30.

Which process of the Electron-hole pair is responsible for emitting of light?

a)

Generation

b)

Movement

c)

Recombination

d)

Diffusion

31.

The advantage of LED is

a)

Long life

b)

Fast on-off switching

c)

Low operating voltage

d)

All of the above

32.

In a Transistor ………………..

a)

I_E = I_C + I_B

b)

I_C = I_E + I_B

c)

I_E = I_C – I_B

d)

I_B = I_C + I_E

33.

BJT is

a)

Bidirectional Junction Transistor

b)

Bipolar Junction Transistor

c)

Bilateral Junction Transistor

d)

Byjunction Junction Transistor

34.

Zener diode is a:

a)

Lightly doped p-n diode

b)

Heavily doped p-n diode

c)

Normally doped p-n diode

d)

None of the above

35.

The Base – Emitter Junction of Transistor should be;

a)

A. Doesn’t conduct

b)

B. Forward Biased

c)

C. Reverse Biased

d)

D. Operates in breakdown region

36.

A semiconductor has ________ temperature coefficient of resistance

a)

Positive

b)

Negative

c)

Zero

d)

None of the Above

37.

The inductor filter gives a smooth output because_________

a)

It offers infinite resistance to ac components

b)

It offers infinite resistance to dc components

c)

Pulsating dc signal is allowed

d)

The ac signal is amplified

38.

The primary function of a common emitter amplifier is to

a)

reduce noise

b)

act as a buffer

c)

perform impedance matching

d)

provide high voltage gain

39.

The voltage gain of a common collector amplifier is approximately

a)

1

b)

greater than 1

c)

less than 1

d)

infinite

40.

In a transistor, the collector current is primarily controlled by

a)

Base current

b)

Emitter current

c)

Collector voltage

d)

Emitter voltage

Quiz on Basic E for BSc Students

Total questions: 40

Worksheet time: 22mins

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