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WorksheetsTransistor &Semiconductor
Total questions: 46
Worksheet time: 35mins
The reverse saturation current in a PN Junction diode is only due to _________________.
minority carriers
majority carries
negative ions
positive ions
Which of the following is a symbol of NPN transistor ?
LED is
Light Enhancing Diode
Light Emitting Diode
Light Emitting Detector
Light Enhancing Detector
The energy band in which free electrons exist is know as
first band
second band
conductive band
valence band
What is the most common semiconductor material used for producing integrated circuits
Quartz
Silicon
Diamond
Tantalum
A transistor is said to be in active region, when
BE junction forward biased and BC junction reversed biased
BE junction forward biased and BC junction forward biased
BE junction reverse biased and BC junction reversed biased
none of above
What is the name of this component?
PN junction
LED
silicon
PNP
semiconductor is
poor conductivity
lies between conductivity and insulator
Examples for N-type material
Arsenic
Aluminium
Antimony
Bismuth
Examples for P-type material.
Boron
Gallium
Bismuth
Indium
Applying external D.C voltage to any electronic device is called
(a)
In PN junction forward biasing width of the depletion region
Increases
Decreases
The types of breakdown in zener diode reverse bias condition is
Avalanche Breakdown
voltage breakdown
Zener Breakdown
Opto coupler consist of
Light Emitter
Insulator
Light Detector
Light Indicator
Which is not one of the properties of semiconductor?
4 electrons in outermost orbit, in covalent bonding.
Electron free leaves hole.
Semiconductor has 2 types of charge carriers.
all of the above are the properties of it
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
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
What are the 3 legs of a transistor called?
Base, Electrode, Commiter
Bridge, Collector, Extruder
Base, Collector, Emitter
Brake, Collection, Emit
Transistors act like tiny "____________."
Electron sources
Switches
Batteries
Bees?
transistor has 3 electrodes namely
PNP
NPN
Base/ Collector/ Emitter
Drain/ Gate/ Source
In a Transistor ………………..
IE = IC + IB
IC = IE + IB
IE = IC – IB
IB = IC + IE
What are the names of the terminals X, Y and Z?
X = Base, Y = Collector, Z = Emitter
X = Emitter, Y = Base, Z = Collector
X = Collector, Y = Base, Z = Emitter
X = Collector, Y = Emitter, Z = Base
One function of the transistor is to_____________?
rectify
amplify
limit
control
How many terminals are there in a transistor....?
1
2
3
4
Which terminal was heavily dopped....?
Emitter
Base
Collector
None of the above
In which region, the transistor operates.....?
Saturation Region
Cut-off Region
Active Region
None of the above
What is the correct name for this component?
Transistor
Resistor
Thyristor
Thermistor
The shorter leg of an LED is what?
Positive
Negative
A diode is used as rectifier to convert
dc to ac
ac to dc
low current into high current
high current into low current
When the diode is operated in forward bias mode
it offers high resistance
it becomes non conductive
it is open switch
it offers very low resistance
The silver ring marked on diode indicates
anode
tolerance ± %
current rating
cathode
A zener diode is a heavily doped pn junction which is always used in
Forward bias mode
cut off mode
Reverse bias mode
series of load resistor
A pn junction diode which has a sharp breakdown voltage is known as
zener diode
rectifier diode switching diode
switching diode
varactor diode
Zener diodes are mostly used in
current regulator circuit
power regulator circuit
voltage regulator circuit
rectifier circuit
Colour of the LED output light is decided by
coloured glass covering it
colour added at time of manufacturing
material used for its construction
size of LED
In burglar alarm which type of diode is used
rectifier diode
zener diode
photo diode
Switching Diode
An optocoupler is used as
isolator circuit
coupling device
magnifying device
colourful device
In solar cell the short circuit current .......with light intensity
increases
decreases
remains unchanged
falls down to zero
Optocouplers are available in Integrated circuit form
true
false
A diode made of GaAs emits dark ....... light
red
green
blue
In the reverse bias operation diode offers high resistance in the circuit
true
false
When diode is operated in forward bias mode it offers very low resistance in the circuit
true
false
