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SEMICONDUCTOR DEVICES QUIZ 2

Total questions: 50

Worksheet time: 25mins

Name
Class
Date
1.

Which of the following terminals does not belong to the MOSFET?

a)

Drain

b)

Gate

c)

Base

d)

Source

2.

Choose the correct statement

a)

MOSFET is a unipolar, voltage controlled, two terminal device

b)

MOSFET is a bipolar, current controlled, three terminal device

c)

MOSFET is a unipolar, voltage controlled, three terminal device

d)

MOSFET is a bipolar, current controlled, two terminal device

3.

The main factor which differentiates a DEMOSFET from an E-only MOSFET is the absence of :

a)

P-N junctions

b)

Insulated gate

c)

Electrons

d)

Channel

4.

The controlling parameter in MOSFET is

a)

Vds

b)

Ig

c)

Vgs

d)

Is

5.

The main application of the enhancement mode MOSFET is :

a)

Amplification

b)

Switching

c)

Tuning

d)

Rectification

6.

The output characteristics of a MOSFET, is a plot of

a)

Id as a function of Vgs with Vds as a parameter

b)

Id as a function of Vds with Vgs as a parameter

c)

Ig as a function of Vgs with Vds as a parameter

d)

Ig as a function of Vds with Vgs as a parameter

7.

The N-channel MOSFET is considered better than the P-channel MOSFET due to its

a)

faster operation

b)

lower input impedance

c)

TTL compatibility

d)

low noise levels

8.

IGBT full form?

a)

Insulated Gate Bipolar Transistor

b)

Isolated Gate Bipolar Transistor

c)

Intrensic Gate Bipolar Transistor

d)

Isolated Gate Bivalent Transistor

9.

Choose the false statement

a)

SCR is a bidirectional device

b)

SCR is a controlled device

c)

In SCR the gate is the controlling terminal

d)

SCR are used for high-power applications

10.

IDENTIFY THE SYMBOL OF THE COMPONENT IN TH EGIVEN FIG...

a)

ZENER DIODE

b)

TUNNEL DIODE

c)

LED

d)

ALL OFTHE ABOVE.

11.

LIGHT EMITTING DIODE WORKS IN ________________ CONDITION.

a)

REVERSE BIAS

b)

NO BIAS

c)

FORWARD BIAS

d)

NONE OF THE ABOVE.

12.

THE SILICON DIODE HAS _____________ VOLATGE DROP.

a)

0.3V

b)

0.9V

c)

0.7V

d)

1V

13.

The principle of a solar cell is same as the photo diode

a)

TRUE

b)

FALSE

14.

SCOTTKY DIODE OPERATES ONLY WITH

a)

Majority Carriers

b)

Minority Carriers

15.

In a photo diode, when there is no incident light, the reverse current is almost negligible and is called

a)

zener current

b)

dark current

c)

photo current

d)

drift current

16.

Schottky junction made up of

a)

Metal to n region

b)

p to n region

c)

metal to semiconductor

d)

metal to insulator

17.

The tunnneling involves_______

a)

acceleration of electrons in p side

b)

movement of electrons from n side conduction band to p side valance band

c)

charge distribution management in both the bands

d)

positive slope characteristics of diode

18.

what is the meaning of rectification?

a)

a process of smoothing using a capacitor

b)

a process of adding impurities to pure materials

c)

a process of converting an alternating current into a direct current by using a diode.

19.

A TRIAC is_______

a)

3 terminal bidirectional switch

b)

3 terminal bilateral switch

c)

2 terminal switch

d)

2 terminal bilateral switch

20.

The given fig. represents

a)

Triac thyristor

b)

Diac thyristor

c)

Capacitive Diode

d)

None of the above

21.

A device that does not exhibit negative resistance characteristics is

a)

FET

b)

UJT

c)

Tunnel diode

d)

SCR

22.

The thyristor is turned -off when the anode current falls below_____

a)

Forward current

b)

Latching current

c)

Holding current

d)

Breakover current

23.

Inverter converts

a)

DC to AC

b)

AC to DC

c)

DC to DC

d)

AC to AC

24.

If the firing angle in an SCR rectifier is decreased, the output is

a)

Increased

b)

Maximum

c)

Decreased

d)

Remain Unaffected

25.

Comparing a triac & SCR

a)

Both are unidirectional devices

b)

An SCR has less time for turn off than Triac

c)

Both are bidirectional devices

d)

All of the above

26.

IGBTs are widely used in high-current applications.

a)

FALSE

b)

TRUE

27.

Does DIAC is work on AC power supply

a)

yes

b)

no

28.

Which image shows the output of a sine-wave after it has gone through a diode? (Half-wave rectified)

a)
b)
c)
d)
29.

Efficiency of a centre tapped full wave rectifier is _________

a) 50%

b) 46%

c) 70%

d) 81.2%

a)

50%

b)

46%

c)

70%

d)

81.2%

30.

The ripple factor of a bridge rectifier is

a)

0.482

b)

0.8l2

c)

l.ll

d)

1.21

31.

To get a peak load voltage of 40V out of a bridge rectifier. What is the approximate rms value of secondary voltage?

a)

0v

b)

14.4v

c)

28.3v

d)

56.6v

32.

DC average current of a full wave rectifier output is (Where Im is the maximum peak current of input) Iav

a)

2 Im/R

b)

Im/π

c)

Im /2π

d)

1.414 Im /π

33.

Peak inverse voltage for a diode is the

a)

maximum voltage that can be applied across the diode in the conducting direction

b)

voltage corresponding to rated maximum voltage

c)

maximum voltage that can be applied across the diode in the non conducting direction

d)

none of the above.

34.

In a bridge rectifier, the output current is flowing through a different pair of diodes alternately.

a)

True

b)

False

35.

In Full wave rectifier , What Transformer is used ?

a)

Step Up

b)

Step Down

c)

Potential

d)

Center Tapped

36.

The basic purpose of a filter is to

a)

Minimize variations in a.c input signal

b)

Remove ripples from the rectified output

37.

Determine the forward biased diodes at the first positive cycle of the source voltage.

a)

D1

b)

D1 & D2

c)

D3 & D4

d)

D1 & D4

38.

SCR is a ……………….. controlled device

a)

Voltage

b)

Current

c)

Voltage as well as current

d)

None of the above

39.

Acronym for LASER is

a)

Light Absorption by Stimulated Emission of Radiation

b)

Light Amplification by Stimulated Emission of Radiation

c)

Light Alteration by Stimulated Emission of Radiation

d)

Light Attenuation by Stimulated Emission of Radiation

40.

3.What are the materials used to make the Tunnel diode?

a)

AlGaAs

b)

ZnTe

c)

Silicon and germanium materials

41.
In MOSFETs N-channel is more preferred than P-channel because
a)
It is cheaper
b)
It is faster
c)
It has better drive capability
d)
It has better noise immunity
42.
The arrow in a transistor terminal represents
a)
Emitter
b)
Collector
c)
Base
d)
None of the above
43.
The MOSFET combines the areas of ___ & ___
a)
Field effect & MOS technology
b)
Semiconductor & TTL
c)
mos technology & CMOS technology
d)
none of the mentioned
44.

The oxide layer formed in the MOSFET is

a)

Metal oxide

b)

Silicon dioxide

c)

Poly Silicon oxide

d)

Oxides of Non metals

45.

In which region the MOSFET acts as an amplifier?

a)

cutoff region

b)

saturation region

c)

triode/linear region

d)

none

46.

The principle of a solar cell is same as the photo diode

a)

TRUE

b)

FALSE

47.

Photodiode is used in the detection of

a)

Visible light

b)

Invisible light

c)

No light

d)

Both visible and invisible light

48.

The RMS value of a half wave rectifier current is 10 A. Its value for full wave rectification would be

a)

10π2\frac{10\pi}{\sqrt{2}} A

b)

10210\sqrt{2} A

c)

2\sqrt{2} A

d)

20π2\frac{20\pi}{2} A

49.

For single phase supply frequency of 50 Hz, ripple frequency in full wave rectifier is

a)

500

b)

5

c)

100

d)

10

50.

Efficiency of a half wave rectifier is

a)

50%

b)

60%

c)

40.6%

d)

46%

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