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Pn Junction Diode
Quiz 1
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Q.1
The arrow direction in the diode symbol indicates
Direction of electron flow
Direction of hole flow (Direction of conventional current)
Opposite to the direction of hole flow
None of the above
Q.2
The depletion region contains
Electrons
Holes
Immobilized charge carriers
Sea of electrons
Q.3
In a reverse biased PN junction, the current through the junction increases abruptly at
0.5 V
1.1V
0.72 V
Breakdown voltage
Q.4
When the diode is forward biased, it is equivalent to
An off switch
An On switch
A high resistance
None of the above
Q.5
Main phenomenons associated with formation of p-n junctions are
Drift only
Diffusion only
Diffusion and Drift
only doping
Q.6
A forward biased pn junction diode has a resistance of the order of
Ω
kΩ
MΩ
Gelien Sales
Q.7
In Half wave rectifier the diode conducts in only___
positive half cycle
negative half cycle
Q.8
The depletion region consists of
Nothing but minority carriers
Positive and negative ions
No majority carrier
(ii) and (iii)
Q.9
Peak inverse voltage for full wave rectifier
2 VS
Vs
Q.10
The current in a semiconductor is produced by
electron only
holes only
negative ions
both electrons and holes
Q.11
Which of the following is true in case of an unbiased p-n junction diode?a) b) c)
Diffusion of electrons & holes goes on infinitely
Charges establish an electric field across the junctions
There is zero electrical potential across the junctionsd)
Diffusion does not take place
Q.12
When PN junction is in forward bias, by increasing the battery voltage
Circuit resistance increases
Current through P-N junction increases
Current through P-N junction decreases
None of the above happens
Q.13
The Value of Barrier Potential for Ge Diode is
1
0.2
0.5
0.6
Q.14
The displacement of the charges results in
Magnetic field
Electric field
Rust
Hall effect
Q.15
In a PN junction when the applied voltage overcomes the ........ potential, the diode current is large, which is known as ......
Depletion, negative bias
Reverse, reverse bias
Resistance, reverse bias
Barrier, forward bias
Q.16
Characteristics of a diode that helps in rectification
Allows Unidirectional flow of current
Allows Bidirectional flow of current
Opposes the flow of current
conducts in reverse biased
Q.17
Anode is _________ Polarity in diodes
Negative
Positive
Ground
Hot Side
Q.18
If the positive terminal of the battery is connected to the anode of the diode, then it is known as
Forward biased
b) Reverse biased
c) Equilibrium
Q.19
The forbiddenn energy gap for Germanium is of the order of
0.7 eV
0.3 eV
1.1 eV
10 eV
Q.20
Which of the following is a pentavalent impuity added while forming an extrinsic semiconductor ?
Boron
Arsenic
Indium
Gallium
0 h : 0 m : 1 s
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