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WorksheetsBEEME_SOC O
Total questions: 40
Worksheet time: 20mins
A semiconductor is formed by...…...... bonds
Electrovalent
Covalent
Co-ordinate
None of the above
The most commonly used semiconductor is ..........
Silicon
Sulphur
Carbon
Germanium
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 process of adding an impurity to an intrinsic semiconductor is called
Doping
Ionization
Recombination
Atomic modification
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
Which among these is NOT a semiconductor
Germanium
Silicon
Gallium Arsenide
Titanium
Electrons and holes are equal in magnitude but opposite in polarity
True
False
The forbidden energy gap for Silicon is of the order of
0.7 eV
0.3 eV
1.1 eV
10 eV
What is the name of this component?
PN junction
LED
silicon
PNP
Which of the following statements is NOT the diode application in electronic circuit?
Diode as voltage regulator
Diode as Rectifier
Diode as Amplifier
Semiconductors:
Do not conduct
Partially conduct
Full Conduction is observed
same as insulators
Semiconductors have _________ valence electrons
3
5
4
6
__________ Semiconductor exists in its pure form
Extrinsic
Intrinsic
Internal
External
_____________ are called DONARS
P-Type s.c
N-Type s.c
Intrinsic s.c
Zener diode is operated in which of the following bias condition
forward bias
reverse bias
open circuited
unbiased
In the breakdown region, a zener diode behaves like a …………… source.
constant voltage
constant current
constant resistance
variable current
Which of the following is application of zener diode ?
Ampllification
Voltage regulation
Filter
Rectifier
In __________________ region, zener act as _________________.
forward bias, voltage regulator
forward bias, normal diode
reverse break down, normal diode
reverse break down, current regulator
In the circuit, what is the output voltage across 10kΩ?
a) 80 V
b) 50 V
c) 120 V
d) 170 V
Which of the following is the correct symbol for the zener diode?
The depletion region of the Zener diode is ____________
a) Thick
b) Normal
c) Very Thin
d) Very thick
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 %
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.
Half wave rectifier produce only 40% of the efficiency, Is it correct?
Yes
No
The process of converting the AC current into DC current is called...
Filtering
Rectification
Smoothing
Step-down
This circuit is ...
series circuit
half-wave rectifier
full-wave rectifier
diode breakdown
What electrical component is used to smooth half wave current signals?
Resistor
Diode
Capacitor
Voltage regulator
The applied input a.c. power to a half-wave rectifier is 100 watts. The d.c. output power obtained is 40 watts. What is the rectification efficiency ?
40%
60%
80%
90%
The basic purpose of a filter is to
Minimize variations in a.c. input signal.
Suppress harmonics in rectified output.
Remove ripples from the rectified output
Stabilize d.c. output voltage
What type of diode circuit is used to clip off portions of signal voltages above or below certain levels?
clipper or limiter
clamper
voltage regulator
none of the above
Clamping circuit is also called .....
Slicer
Voltage limitter
Amplitude limitter
DC restorer
Positive clipper clips off
negative voltage
positive voltage
ripple voltage
PIV
LED means
Light Emitting Display
Light Emitting Diode
Laser Emitting Display
Laser Emitting Diode
Symbol of LED
None of these
Advantages of LED
High energy efficiency
Long lifespan
Law radiated heat
All of these
Short leg of LED is
Anode
Cathode
Emitter
Collector
The colour of LED depends on
Colour of battery
Colour of Gas used in it
Based on doping material
None of these
