SOLID STATE DEVICES MCQS Part 3

SOLID STATE DEVICES MCQS Part 3

SOLID STATE DEVICES Multiple Choice Questions Part 3.

1 It is the current gain for the common-emitter configuration
a
þ
6
q

2 when a factor a junction transistor is 0.98,the factor would be equivalent to
  value of transistor’s beta.
49
60
20
38

3 An emitter resistor is used for_____in most amplifier circuits.
Temperature stabilization
Biasing a bipolar junction transistor
Current limitation
Voltage amplification

4 What line is drawn between the open-circuit current on a JFET characteristic curve?
Operating point
Load line
Tangent line
Quiescent point

5 Which of the choices below is another name for a photoconductive cell?
Varicap
Varistor
Photoresistive device
Photodiode

6 When both emitter and collector junctions are reverse biased, the transistor is said to be at region.
Active
Cut-off
Saturation
Amplifying

7 What type of diode is used for tuning receivers and is normally operated with reverse bias and derived its name from voltage variable capacitor?
Hot-carrier diode
Varactor diode
Tunnel diode
Zener diode

8 What silicon npn tetrode serves as bistable negative-resistance device?
BJT
Binistor
FET
Thermistor

9 A multiple-terminal solid-state device similar to a transistor that generates frequencies up to about 10000 MHz by injecting electrons or holes into a space-charge layer which rapidly forces these carriers to a collecting electrode.
Magnetron
IMPATT
Klystron
Spacistor

10 Which of the items below is not a good conductor?
Electrolytes
Ionized gases
Silicon
Silver

11 What is the net charge if a certain semiconductor losses 4 valence electrons?
⦁      +4
⦁       -4
⦁      +8
⦁      -8

12 What is the net charge if a certain semiconductor gains one valence electron?
⦁      +1
⦁      -1
⦁      +4
⦁      -4

13 What is the approximate voltage drop of LED?
0.3 V
0.7 V
1.5 V
3.8 V

14 Under standard conditions, pure germanium has a resistivity of
60 fi-cm
60 fi-m
60 fi-mm
⦁    . 60 x 10-4

15 The holding of one extreme amplitude of the input waveform to a certain amount of potential is called
Slicing
Limiting
Rectifying
Clamping

16 Clamper is also known as
DC restorer
Rectifier
Charger
Clipper

17 Percentage ripple can be calculated by getting the and multiplying the result by100%.
Ratio of the input resistance and input voltage
Product of the ac current to dc current
Ratio of the ac voltage to dc voltage
Addition of the ac and dc component of the given signal

18 Which of the following materials has the smallest leakage current?
Germanium
Carbon
Sulfur
Silicon

19 What refers to annihilation of a hole and electron?
Doping
Recombination
Diffusion
Bonding

20 What are the two possible breakdown mechanisms in pn junction diodes?
Reverse and breakdown effects
Threshold and knee effects
Avalanche and forward effects
Zener and avalanche effects

21 What occurs in pn diodes when the electric field in the depletion layer increases to the point where it can break covalent bonds and generate electron hole pairs?
Covalent breakdown
Diffusion
Zener breakdown
Avalanche effect

22 The amount of additional energy required to emit an electron from the surface of metal is called
Potential barrier
Junction voltage
Work function
Knee voltage

23 When temperature of a pure semiconductor is increased, its resistance
Decreases
Remains the same
Increases
Cannot be estimated

24 As a general rule, are found only in semiconductors.
Electrons
Bulk resistances
Depletion layers
Holes

25 What in a semiconductor is defined as the incomplete part of an electron pair bond?
Hole
Valence electron
Impurity
Ion

26 When the number of free electrons is increased in doped semiconductor, it becomes a/an semiconductor.
N type
P type
PN type
NP type

27 Reducing the number of free electrons in a doped semiconductor forms a/an
  semiconductor.
N type
P type
PNPN type
NPN type

28 Pure semiconductor atoms contain how many valence electrons?
1
2
4
8

29 An acceptor atom contains how many valence electrons?
1
2
3
4

30 What is the resistivity of an extrinsic semiconductor?
1 fi-cm
2 fi-cm
3 fi-cm
4 fi-cm

31 The forward resistance crystal diode is in the order of
fi
mfi
µfi
kfi

32 What is the ideal value stability factor?
1
⦁    . 0.5
Infinite
⦁      100

33 What is the approximate mass of a neutron at rest?
⦁      1.6726 x 10^-27 kg
⦁      9.1096 x 10^-31 kg
⦁      1.6022 x 10^-19 kg
No mass

34 Approximate mass at rest of a proton is to that of a neutron.
Greater than
Equal
Less than
Comparable

35 Charge of an electron is approximately equal to.
⦁       1.6022 x 10^-19 C
⦁      -1.6726 x 10^-27 C
⦁      -1.6022 x 10^-19 C
⦁      No charge

36 What capacitors are used in transistor amplifiers?
Mica
Air
Electrolytic
Paper

37 What is the reason why a common collector is used for impedance matching?
Its output impedance is very high
Its output impedance is very low
Its input impedance is very low
Its input impedance is very high

38 In power supplies, circuits that are employed in separating the ac and dc components and bypass the ac components around the load, or prevent their generation are called
Filters
Limiters
Series capacitors
Diode circuits

39 A nuclei with a common number of protons, but with different number of neutrons
Fission
Isotope
Atom
Core

40 What is the reason why FET has high input impedance?
Because its input is a forward biased
Because of the impurity atoms
Because its input is reverse biased
Because it is made of semiconductor material.

41 A MOSFET is sometimes called FET
Open gate
Shorted gate
Metallic gate
Insulated gate

42 Which of the following choices is an advantage of a MOSFET over a BJT in an
RF amplifier circuit?
Low voltage operation
Low noise
Low amplification of signals
Compatibility

43 The voltage gain of an emitter follower circuit is
High
Low
Very high
Moderate

44 A is considered a current controlled device.
Diode
Field effect transistor
Transistor
Resistor

45 A is considered a voltage controlled device
FET
Diode
Transistor
Capacitor

46 The value of coupling capacitor, Cc in RC coupling is about
0.01 µF
0.1 µF
10 µF
100 µF

47 FET has a pinch-off voltage of about
0.5 V
5 V
10 V
20 V

48 What is the point of intersection between a diode characteristic and a load line?
Q point
Quiescent point
Operating point
All of the above

49 A measure of the ability of an LED to produce the desired number of lumens generated per applied watt of electrical energy.
Luminous intensity
Luminous efficiency
Luminous efficacy
Luminous ability

50 Photoconductive effect means
The decreased conductivity of an illuminated semiconductor junction
The increased conductivity of an illuminated semiconductor junction
The conversion of photonic energy to electromagnetic energy
The conversion of an electromagnetic energy to photonic energy

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