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WorksheetsSemiconductors and photodetectors
Total questions: 25
Worksheet time: 13mins
The depletion region contains
Electrons
Holes
Immobilized charge carriers
Sea of electrons
Main phenomenons associated with formation of p-n junctions are
Drift only
Diffusion only
Diffusion and Drift
only doping
In the forward bias arrangement of a p-n junction diode,
the n-end is connected to the positive terminal of the battery
the p-end is connected to the positive terminal of the battery
the direction of current is from n-end to p-end in the diode
the p-end is connected to the negative terminal of the battery
Anode is _________ Polarity in diodes
Negative
Positive
Ground
Hot Side
In pn junction diode which is reverse biased, the current flow is due to the
movement of electrons from p-side to n-side
movement of electrons from n-side to p-side
movement of holes from depletion region to p-side
movement of electrons from depletion region to n-side
1. In an intrinsic semiconductor, the electron and hole densities are equal at which temperature? e electron and hole densities are equal at which temperature?
0 Degree K
0 Degree C
High temperatures
All temperatures
2. The diffusion current is due to --------------
Majority charge Carriers
Minority charge Carriers
Negative ions
Positive ions
4. When the reverse voltage across a p-n junction is gradually decreased, the depletion region
Does not change in width
Initially increases up to a certain width and then decreases
Continuously increases in width
Continuously decreases in width
3. The drift current is due to
Majority charge Carriers
Minority charge Carriers
Negative ions
Positive ions
Diode is given its name because it's a combination of ____
1 electrode
2 electrodes
3 electrodes
barrier potential for Si___
0.3 V
0.7V
the depletion layer in reverse biased condition
wider
Narrow
The value of leakage current in reverse biased condition
10mA
μA
What is rectifier?
(a)
What bias is it?
Forward
Reverse
No
Forward and Reverse
Solar (or PV) cells are made of many individuals cell stacked together, and these are made of materials called ______________.
diodes
electrometals
semiconductors
solarductors
In order to create higher current, solar cells are connected in ______________.
inverters
series
parallel
wires
PV cells are connected together to increase power output and form modules which are then assembled together into larger units called _____________________.
arrays
cell blocks
grids
mega-modules
In order to increase voltage, several solar cells are connected in __________________.
inverters
wires
parallel
series
What is the unit for power?
amps
watts
joules
newtons
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 is the amount of energy required to free an outer shell electron from its orbit to a free state?
band gap
electron volt
wavelength
photovoltaic
Which material below is not used for PV panels?
Cadmium Telluride (CdTe)
Copper-indium selenide (CulnSe2)
Gallium Arsenide (GaAs)
Fiberglass (FiGl)
Which device converts direct current (DC) from a PV system to alternating current (AC) used by appliances in a house?
inverter
diode
alternator
battery
