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