Semiconductor Electronics: Materials, Devices and Simple Circuits Test 11

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Semiconductor Electronics: Materials, Devices and Simple Circuits Test 11

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Question 1
1 / -0

Zener diode is used for

A
amplification

B
rectification

C
stabilisation

D
all of the above

Solution

A zener diode is always operated in its reverse biased condition. A voltage regulator circuit can be designed using a zener diode to maintain a constant DC output voltage across the load in spite of variations in the input voltage or changes in the load current. The zener voltage regulator consists of a current limiting resistor $$R_S$$ connected in series with the input voltage $$V_S$$ with the zener diode connected in parallel with the load RL in this reverse biased condition.Hence we can say that ,zener diode is used for stabilization.
Question 2
1 / -0

Zener diode works on

A
zero bias

B
reverse bias

C
forward bias

D
infinite bias

Solution

We know that zener diode works on the reverse bias. When the reverse bias is equal to the break-down voltage, the voltage across the zener remains almost constant and the current increases rapidly.
Question 3
1 / -0

In insulator

A
valence band is partially filled with electrons

B
conduction band is partially filled with electrons

C
conduction band is filled with electrons and valence band is empty

D
conduction band is empty and valence band is filled with electrons

Solution

Insulators are the materials which do not conduct electricity. All the electrons are filled in valance band whereas the conduction band is empty. Moreover, the energy band gap in insulators is very large, thus electrons cannot jump from valence band to conduction band.
Question 4
1 / -0

The distinction between conductors, insulators and semiconductors is largely concerned with

A
their ability to conduct current

B
the type of crystal lattice

C
binding energy of their electrons

D
relative widths of their energy gaps

Solution

According to band theory, distinction between conductors, insulators and semiconductors is based on relative width of energy gaps between valence band and conduction band.
Question 5
1 / -0

The diffusion current in a p-n junction is

A
from the n-side to the p-side

B
from the p-side to the n-side

C
from the n-side to the p-side if the junction is forward-biased and in the opposite direction if it is reverse-biased

D
from the p-side to the n-side if the junction is forward-biased and in the opposite direction if it is reverse-biased

Solution

Holes from p-type diffuse into the n-type and electrons from n-type diffuse into the p-type due to concentration gradient to form a depletion region which results in the rise of diffusion current flowing from p to n side.
Question 6
1 / -0

Which of the following logic gates is an universal gate?

A
OR

B
NOT

C
AND

D
NOR

Solution

NAND gate is considered universal gate. As other gates can be formed from this gate.
Question 7
1 / -0

Which among the following is an example of a semiconductor?

A
cuprous oxide

B
iron

C
copper

D
aluminium

Solution

Iron, Copper, Aluminium are metals and are therefore conductors whereas Cuprous oxide is a semiconductor.
Question 8
1 / -0

If $${n}_{p}$$ and $${n}_{e}$$ are the number of holes and conduction electrons in an intrinsic semiconductor then _________.

A
$${n}_{p}> {n}_{e}$$

B
$${n}_{p}={n}_{e}$$

C
$${n}_{p}< {n}_{e}$$

D
$${n}_{p}\ne {n}_{e}$$

Solution

In an intrinsic semiconductor,
no. of holes=no.of electrons
So,
$$n_p=n_e$$
Question 9
1 / -0

The lead marked with the arrow is the _______.

A
collector

B
base

C
emitter

D
core

Solution

It is a p-n-p, transistor. The Lead marked with the arrow is the emitter. It tells the direction of the flow of the holes i.e, the flow of conventional current.
Question 10
1 / -0

$$A$$ $$B$$ $$Q$$
$$0$$ $$0$$ $$0$$
$$0$$ $$1$$ $$1$$
$$1$$ $$0$$ $$1$$
$$1$$ $$1$$ $$1$$
The truth table is given above for which of the following gates is correct

A
NAND gate

B
OR gate

C
AND gate

D
NOT gate

Solution

Given table represents 'OR' gate.

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$$A$$	$$B$$	$$Q$$
$$0$$	$$0$$	$$0$$
$$0$$	$$1$$	$$1$$
$$1$$	$$0$$	$$1$$
$$1$$	$$1$$	$$1$$

Semiconductor Electronics: Materials, Devices and Simple Circuits Test 11

Result

Semiconductor Electronics: Materials, Devices and Simple Circuits Test 11

Score

-

Rank

-

SHARING IS CARING

Question 1

amplification

rectification

stabilisation

all of the above

Solution

Question 2

zero bias

reverse bias

forward bias

infinite bias

Solution

Question 3

valence band is partially filled with electrons

conduction band is partially filled with electrons

conduction band is filled with electrons and valence band is empty

conduction band is empty and valence band is filled with electrons

Solution

Question 4

their ability to conduct current

the type of crystal lattice

binding energy of their electrons

relative widths of their energy gaps

Solution

Question 5

from the n-side to the p-side

from the p-side to the n-side

from the n-side to the p-side if the junction is forward-biased and in the opposite direction if it is reverse-biased

from the p-side to the n-side if the junction is forward-biased and in the opposite direction if it is reverse-biased

Solution

Question 6

OR

NOT

AND

NOR

Solution

Question 7

cuprous oxide

iron

copper

aluminium

Solution

Question 8

$${n}_{p}> {n}_{e}$$

$${n}_{p}={n}_{e}$$

$${n}_{p}< {n}_{e}$$

$${n}_{p}\ne {n}_{e}$$

Solution

Question 9

collector

base

emitter

core

Solution

Question 10

NAND gate

OR gate

AND gate

NOT gate

Solution

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