SOLID STATE DEVICES MCQS Part 1

SOLID STATE DEVICES MCQS Part 1

SOLID STATE DEVICES Multiple Choice Questions Part 1.

1 How many electrons are there in the fourth orbit of a copper atom?
1
2
3
4

2 The maximum permissible number of electrons in the third orbit is
18
8
32
2

3 Varactor diodes are commonly used
As voltage controlled capacitance
As a constant current source
As voltage multiplier
As a constant voltage source

4 The reason why electrons are not pulled into the nucleus of an atom.
Because of the centrifugal or outward force created by their orbital motion.
Because of the force of attraction between them and the nucleus is weak.
Because they are not being attracted by the positive nucleus.
Because of the strong bonding between them that resists any force pulling them towards the nucleus.

5 The electrons in the largest orbit travel than the electrons in the smaller orbits.
More slowly
Faster
In the same velocity
A little bit slower

6 A transistor configuration with the lowest current gain.
Common base
Common emitter
Common collector
Emitter-follower

7 A semiconductor in its purest form is called
Pure semiconductor
Doped semiconductor
Intrinsic semiconductor
Extrinsic semiconductor

8 Valence orbit is the other form for
Outer orbit
3rd orbit
4th orbit
2nd orbit

9 K shell means
First orbit
2nd orbit
3rd orbit
4th orbit

10 For either germanium or silicon diodes, the barrier potential decreases for each
Celsius degree rise.
1 mV
3 mV
4 mV
2 Mv

11 A diode modeling circuit which considers the threshold voltage, average resistance and switch as the diode’s equivalent circuit.
Ideal model
Simplified model
Piecewise linear model
Real model

12 There are two mechanisms by which holes and electrons move through a silicon crystal. They are
Covalent bond and recombination
Diffusion and drift
Free and charge particles
Forward and reverse bias

13 A semiconductor is an element with a valence of
Four
Eight
Two
One

14 What orbit controls the electrical property of the atom?
Valence orbit
First orbit
Fourth orbit
M shell

15 _____is a substance that contains atoms with several bands of electrons but with only one valence electron.
Insulator
Conductor
Semiconductor
Resistor

16 Pure silicon crystal atoms contain how may valence electrons as a result of covalent bonding?
1
4
8
16

17 The peak inverse voltage of a full wave center tapped rectifier circuit is equal to 
of the input signal.
Thrice the peak
Twice the peak
One half
One third

18 Diffusion or storage capacitance is the term used to refer to
The reverse bias capacitance of a diode
The forward bias capacitance of a diode
The breakdown capacitance of a zener diode
The effective capacitance of the rectifier

19 What is considered as the key electrical conductivity?
The number of electrons in the valence orbit
The number of protons in the nucleus
The number of neutrons in the nucleus
The number of protons plus the number of electrons in the atom

20 Each atom in the silicon crystal has how many electrons in its valence orbit?
8
32
2
4

21 Lifetime is the amount of time between the creation and disappearance of a/an
Free electron
Proton
Ion
Neutron

22 A silicon crystal is an intrinsic semiconductor
If every atom in the crystal is a silicon atom
If majority of the atoms in crystal is a silicon atom
If the crystal contains 14 silicon atoms
If the crystal is undoped

23 At room temperature, a silicon crystal acts approximately like a/an
Insulator
Semiconductor
Conductor
Superconductor

24 An extrinsic semiconductor is a
Doped semiconductor
Pure semiconductor
Good insulator
Good conductor

25 What is associated with random motion due to thermal agitation in the movement of holes and electrons in a silicon crystal?
Drift
Diffusion
Doping
Recombination

26 The peak inverse voltage of a half wave rectifier circuit is approximately equal to the
  of the input signal.
Peak amplitude
Frequency
Voltage sinusoidal
Current

27 Silicon that has been doped with a trivalent impurity is called a/an
P-type semiconductor
N-type semiconductor
Intrinsic semiconductor
Extrinsic semiconductor

28 Silicon that has been doped with a pentavalent impurity is called a/an
N-type semiconductor
P-type semiconductor
Intrinsic semiconductor
Extrinsic semiconductor

29 What is another name for a pn crystal
Junction diode
PN junction
Diode
Lattice

30 An acceptor atom is also called
Pentavalent atom
Trivalent atom
Minority carrier
Majority carrier

31 Which is a donor atom?
Trivalent atom
Aluminum
Boron
Pentavalent atom

32 In an n-type semiconductor, free electrons are called
Minority carriers
Valence electrons
Majority carriers
Charge carriers

33 in an n-type semiconductor, holes are called
minority carriers
majority carriers
protons
charge carriers

34 What is the barrier potential of germanium at 25˚C
0.7 V
0.3 V
0.5 V
0.4 V

35 The barrier potential for a silicon diode at 25˚C is approximately
0.4 V
0.3 V
0.7 V
0.5 V

36 Each pair of positive and negative ions at the junction is called a/an
Anion
Positron
Cation
Dipole

37 When temperature increases, barrier potential 
Remains the same
Decreases
Increases
Either increases or decreases depending on the semiconductor material used

38 Avalanche effects occurs at
Higher reverse voltages
Lower reverse voltages
Higher forward voltages
Lower forward voltages

39 The creation of free electrons through zener effect is also known as
Avalanche emission
Thermionic emission
Low-field emission
High-field emission

40 Zener effect only depends on the
High-speed minority carriers
High-speed majority carriers
Intensity of the electric field
Intensity of the magnetic field

41 What temperature is inside the diode, right at the junction of the p and n-type materials?
Junction temperature
Ambient temperature
Internal temperature
Absolute temperature

42 What is the input control parameter of a FET?
Gate voltage
Source voltage
Drain voltage
Gate current

43 One of the important diode parameters which gives the magnitude of current the diode candle without burning.
Reverse saturation current
Reverse current
Forward current
Forward breakdown current

44 The maximum reverse voltage that can be applied before current surges is called
Reverse recovery time
Maximum junction voltage
Forward voltage
Reverse breakdown voltage

45 What is the other name of Esaki diode?
Diac
Hot-carrier diode
Shockley diode
Tunnel diode

46 The most important application of schottky diodes is in
Digital computers
Power supplies
Amplifier circuits
Voltage regulators

47 A diode is a nonlinear device because
It produces a nonlinear graph
Its current is not directly proportional to its voltage
It has a built-in barrier potential
It can rectify alternating current

48 The sum of the resistance of the p-region and the n-region is called
Junction resistance
Extrinsic resistance
Intrinsic resistance
Bulk resistance

49 What is the typical bulk resistance of rectifier diodes?
Less than 1fi
Greater than1fi
Equal to 1fi
It depends on the doping level

50 The reverse bias diode capacitance is termed as
Transition region capacitance
Diffusion capacitance
Storage capacitance
Reverse capacitance

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