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Assertion
(A): In CE connection of n-p-ntransistor.
VCE ispositive.
Reason (R): In BJT, the base collector junction is reverse biased
A is true but R is false
Both A and R are true and R is correct explanation of A
A is false but R is true
Both A and R are true but R is not a correct explanation of A
Resistivity is a property of a semiconductor that depends on
the atomic nature of the semiconductor
the atomic weight of the semiconductor
the atomic number of the semiconductor
the shape of the semiconductor
The derating factor for a BJT transistor is about
25 mW/°C
2.5 mW/°C
0.5 mW/°C
10 mW/°C
In a bipolar junction transistor adc = 0.98, ICO= 2 μA and 1B = 15 μA. The collector current IC is
935 mA
835 mA
635 mA
735 mA
Which of the following is the ferric electric material
Potassium dihydrogen phosphate
All of the above
Barium titanate
Rochelle salt
Greatest mobility can be expected in case of
holes
negative ions
electrons
protons
Which of these has a layer of intrinsic semiconductor
Schottky diode
Zener diode
PIN diode
Photo diode
An ideal Op-amp is an ideal
voltage controlled current source
current controlled voltage source
current controlled current source
voltage controlled voltage source
A bistable multivibrator
has one stable state
None of the above
has no stable state
has two stable state
In P-N junction, the region containing the uncompensated acceptor and donor ions is called
transition zone
Active region
neutral region
depletion region
Which of the following could be the maximum current rating of junction diode by 126
1 A
100 A
10 Å
20 A
An LED has a rating of 2 V and 10 mA. It is used along with 6Vbattery.
The range of series resistance is
0 to 200 Ω
400 Ω and above
200 - 400 Ω
200 Ω and above
A sample of N type semiconductor has electron density of 6.25 x 108/cm2 at 300 K. If the intrinsic concentration of carriers in this sample is 2.5 x 1013/cm3 at this temperature, the hole density works out to be
10l2/cm3
108/cm3
1010/cm3
106/cm3
Barkhausen criterion of oscillation is
Aβ = < 1
Aβ > 1
Aβ ≤ 1
Aβ = 1
A long specimen of P type semiconductor material
is electrically neutral
is + vely charged
has an electric field directed along its length
acts as a dipole
Which of the following pairs of semiconductors and current carriers is correctly matched
Bulk : neither electrons nor holes
P type : number of electrons > number of holes
Intrinsic : number of electrons = number of holes
N type : number of electrons < number of holes
What happens when forward bias is applied to a junction diode
Potential barrier is increased
Potential barrier is decreased
Majority carrier current is reduced to zero
Minority carrier current is reduced to zero
A Darlington emitter follower circuit is some times used in the output stage of a TTL gate in order to
increase its IQL
increase its speed of operation
reduce its I0H
reduce power dissipation
If too large current passes through the diode
diode will emit light
excessive heat may damage the diode
all holes will freeze
all electrons will leave
An extrinsic semiconductor sample has 6 billion silicon atoms and 3 million pentavalent impurityatoms.
The number of electrons and holes is
3 million free electrons and very small number of holes
3 million each
6 billion each
3 million holes and very small number of free electrons
1
2
19
37
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