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Semiconductor Device
Quiz 2
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Q.1
Zener diode are used as voltage regulator
true
false
Q.2
Is the element added to the type p semiconductors.
Antimony
Boron
Chlorine
Argon
Q.3
A diode made of GaAs emits dark ....... light
red
green
blue
Q.4
Optocouplers are available in Integrated circuit form
true
false
Q.5
A photodiode is used in ................... mode
Reverse Bias
reverse biased
reverse biaseding
All of above
Q.6
The reference level of a signal can be changed by using ........
Clipper circuit
clamper circuit
zero level circuit
rectifier circuit
Q.7
In solar cell the short circuit current .......with light intensity
increases
decreases
remains unchanged
falls down to zero
Q.8
A device that converts the energy of light directly into electrical energy is
photodiode
LED
Solar Cell
rectifier diode
Q.9
An optocoupler is used as
isolator circuit
coupling device
magnifying device
colourful device
Q.10
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
Q.11
Semiconductor are substances whose electrical conductivity lies between that of
conductor and insulator
conductor and metal
plastic and wood
insulator and gold
Q.12
A diode is used as rectifier to convert
dc to ac
ac to dc
low current into high current
high current into low current
Q.13
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
Q.14
A pn junction diode which has a sharp breakdown voltage is known as
zener diode
rectifier diode switching diode
switching diode
varactor diode
Q.15
Zener diodes are mostly used in
current regulator circuit
power regulator circuit
voltage regulator circuit
rectifier circuit
Q.16
Current limiting resistance value used in series with LED is normally between
220Ω to 330Ω
220kΩ to 330kΩ
220MΩ to 330MΩ
50Ω to 55Ω
Q.17
The silver ring marked on diode indicates
anode
tolerance ± %
current rating
cathode
Q.18
What does the diode do?
Making a uni directional current flow.
Making a bi directional current flow.
Q.19
What we have inside of a charger?
Transformer
Diode
none of them
both of them
Q.20
Why do we need a transformer in the charger?
Boosting up the voltage
Lowering down the voltage
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