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Diode characteristics
Diode characteristics
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1)
Which of the following is the correct relation between electron and hole concentrations of an intrinsic semiconductor?
n(e) = n(n)
n(e)> n(n)
n(e) = [n(n)]^2
2)
Why do the n- type semiconductors are called so?
None of these.
Because of the absence of holes.
Electrons are the charge carriers in n- type semiconductors.
Electron concentration is much less than hole concentration.
3)
What happens to the width of depletion layer of a p-n junction diode while forward biasing?
Increases
None of these
Decreases
Remain fixed
4)
How are electrical conductivity (σ) and resistivity (ρ) of a semiconductor material is related?
σ ∝ 1/ρ
σ ∝ ρ-2
σ ∝ ρ2
σ ∝ ρ
5)
The depletion region of a p-n junction diode is one which consists of
Free charges
Positive ions
Atoms
Immobile charges
6)
Which of the following is equivalent to a revere biased p-n junction diode?
A variable resistance
ON state of a switch
Amplifier
OFF state of a switch
7)
Find out the correct statement about semiconductors from the following?
All of the above are correct.
It is crystalline in nature
It has covalent bonding
It has a negative temperature coefficient
8)
What is the type of extrinsic semiconductor obtained by adding a trivalent impurity to an intrinsic semiconductor?
Data inadequate
Either a or b
N- type
P- type
9)
What is the behavior of an intrinsic semiconductor at absolute zero temperature?
Becomes an extrinsic semiconductor
Behaves like an insulator
No change in its semiconducting nature
Behaves like a metallic conductor
10)
When a large reverse voltage is applied, the current flowing through a p-n junction diode at room temperature is 0.2µA. Calculate the current when a forward voltage of 0.1 V is applied across the junction?
0.916 µA
9.16 µA
91.6 µA
9.16 A
