WorksheetsQuiz 1: Semiconductors
Total questions: 50
Worksheet time: 26mins
Materials which can conduct electricity better than insulator,but not as well as conductors. This is the definition of
diode
semiconductor
conductor
insulator
superconductor
Which is not one of the properties of semiconductor?
4 electrons in outermost orbit, in covalent bonding.
atoms vibrate causes electron to break free from the bonds.
Electron free leaves hole.
Semiconductor has 2 types of charge carriers.
all of the above are the properties of it
These are the characteristics of Trivalent impurities except
•3 valence electrons
•produce p-type semiconductors
•producing a "hole".
Antimony, arsenic, and phosphorus are the examples
The characteristics of p-type semiconductors is includes
Majority carriers are electron
Has tendency to gain electron
Has tendency to donor electron
Easy to conduct electricity
The process of adding an impurity to an intrinsic semiconductor is called
Doping
Ionization
Recombination
Atomic modification
What is the most common semiconductor material used for producing integrated circuits
Quartz
Silicon
Diamond
Tantalum
How is conduction increased in an p-type semiconductor?
by increased applied electrical field
by decreased applied electrical field
by the availability of extra holes
by the availability of donor electrons
A material that conducts electricity well tends to have ____.
no valence electrons
partially filled bands
completely filled bands
conduction and valence bands that are far apart
The forbiddenn energy gap for Germanium is of the order of
(a) 0.7 eV
(b) 0.3 eV
(c) 1.1 eV
(d) 10 eV
Which among these is NOT a semiconductor
Germanium
Silicon
Gallium Arsenide
Titanium
An n type semiconductor is negatively charged
True
False
The forbidden energy gap for Silicon is of the order of
0.7 eV
0.3 eV
1.1 eV
10 eV
Who contribute to the current in a semiconductor
electrons only
holes only
negative ions
both electrons and holes
The minority carriers in P-type silicon are called _________________
Neutron
Proton
Electron
Hole
conductivity of semiconductor increases with increase in temperature, because
number density of free charge carriers increases
relaxation time increases
both number density of free charge carriers and relaxation time increases
number density of free charge carriers increases relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density
Zener diodes are also known as
a) Voltage regulators
b) Forward bias diode
c) Breakdown diode
d) None of the mentioned
Which of the following is the correct symbol for the zener diode?
In the breakdown region, a zener diode behaves like a …………… source.
constant voltage
constant current
constant resistance
none of the above
The maximum efficiency of a half-wave rectifier is ………………..
40.6 %
81.2 %
50 %
25 %
Avalanche breakdown mainely occurs due to a factor called....
applied E-field
collisions of charge carriers
thermal energy
equilibrium conditions
Zener breakdown mainely occurs due to a factor called...
collisions of charge carriers
applied E-field
equilibrium condition
thermal energy
which of the following is application of zener diode ?
Ampllification
voltage regulation
filter
rectifier
What are ripples
DC supplied by a cell
AC component in household circuits
AC component that remains in rectified circuit
AC component that remains in filtered circuit
Device used for filter circuit is
Diode
Capacitor
Transistor
Amplifier
The output wave form of a full wave rectifier is
an AC voltage
an DC voltage
Zero
a pulsating unidirectional voltage
The p-n junction which generates an emf when solar radiation falls on it, with no external bias applied, is a
Light Emitting diode
Photodiode
Solar cell
Zener Diode
What are the most commonly used active filters?
All of the mentioned
Low pass and High pass filters
Band pass and Band reject filters
All-pass filters
Three common types of filters used in analog devices are...
Low pass filter
Medium pass filter
High pass filter
Band pass filter
Common emitter amplifier
The frequency of the DC signal is...
60 Hz
0 Hz
50 Hz
Capacitance is measured in?
Seconds
Hertz
Henries
Farads
What formula is pictured?
Inductive Reactance
Capacitive Reactance
Series Z
Parallel Z
full form of LED
light emitting diode
light limiting diode
light storing diode
light electrification diode
LED works only in ______ bias
Forward
Reverse
The colour of emitted light from LED depends on
physical dimensions of LED
Number of available carriers
Type of semiconductor material used
Number of recombinations taking place
The advantage of LED is
Low operating voltage
Long Life
Small in Size
All the above
When forward biased, LED emits light because of
Recombination of carriers
Light generated in breaking the covalent bonds
Light produced by collisions
None of the above
The LEDs made with GaAs emit light in the
Yellow region
Infrared region
Orange region
Red visible region
The LEDs made with GaAsP emit light in the
Red
Yellow
Green
White
All of the following have the same units except:
inductance.
capacitive reactance.
impedance.
resistance.
The formula for inductive reactance is
ωL1
ωC
ωC1
ωL
The instantaneous current in an ac circuit is i=2.0 sin314t, what is its frequency?
100 Hz
60 Hz
50 Hz
2π
This image is the example of ___ Component.
Passive
Active
The component in the image is a...
Active Component
Passive Component
The electromagnetic spectrum describe the entire range of light radiation from ___________ to ______________.
ultraviolet, infrared
x-rays, radio waves
gamma rays, radio waves
gamma rays, microwaves
What will happen, if we connect capacitor to DC Supply.
It allows DC
It blocks DC
t rectifies
None of these
Hint: Diode is unidirectional and uncontrolled device. In rectifier circuit, diode use as a switch to convert ac to dc for rectification purpose.
What is the Ripple factor of a fullwave rectifier ?
0.48
0.31
0.707
1.414
Which of the following electrical symbols is used to represent the electrical component shown above in a circuit?
Which of the following electrical symbols is used to represent the electrical component shown above in a circuit?
