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WorksheetsSemiconductor
Total questions: 25
Worksheet time: 25mins
Semiconductor are substances whose electrical conductivity lies between that of
conductor and insulator
conductor and metal
plastic and wood
insulator and gold
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
Current limiting resistance value used in series with LED is normally between
220Ω to 330Ω
220kΩ to 330kΩ
220MΩ to 330MΩ
50Ω to 55Ω
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 optocoupler LED and ............ are enclosed in one package
rectifier diode
photo transistor
zener diode
resistor
A device that converts the energy of light directly into electrical energy is
photodiode
LED
Solar Cell
rectifier diode
In solar cell the short circuit current .......with light intensity
increases
decreases
remains unchanged
falls down to zero
The reference level of a signal can be changed by using ........
Clipper circuit
clamper circuit
zero level circuit
rectifier circuit
A photodiode is used in (a) mode
The amount of light striking the junction can control the reverse current in a diode which is called (a)
(a) is a heavily doped pn junction diode which is always used in reverse bias mode.
Optocouplers are available in Integrated circuit form
true
false
A diode made of GaAs emits dark ....... light
red
green
blue
Zener diode are used as voltage regulator
true
false
Zener diode is always used in reverse bias
true
false
In zener diode construction to have tunneling current the metallurgical junction is very sharp and doping is high
true
false
When diode is operated in forward bias mode it offers very low resistance in the circuit
true
false
In the reverse bias operation diode offers high resistance in the circuit
true
false
