Semiconductor Electronics: Materials, Devices and Simple Circuits Test 6

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Semiconductor Electronics: Materials, Devices and Simple Circuits Test 6

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Weekly Quiz Competition

Question 1
1 / -0

Among the following which one gives output $$1$$ in the AND gate.

A
$$A = 0,\ B = 0$$

B
$$A = 1,\ B = 1$$

C
$$A = 1,\ B = 0$$

D
$$A = 0,\ B = 1$$

Solution

The truth table for AND gate is as shown in the figure. Thus, the output of an AND gate is $$1$$, if and only if both inputs '$$A$$' and '$$B$$' are $$1$$.
Question 2
1 / -0

The avalanche breakdown in p-n junction is due to

A
shift of Fermi level.

B
cumulative effect of conduction band electron.

C
widening of forbidden gap.

D
high impurity concentration.

Solution

The avalanche breakdown in p-n junction is due to cumulative effect of conduction band electron. In reverse bias, due to applied electric field, electrons acquire enough energy to free more electron bound to the atom. The abundant number of electron-hole pairs are created for conduction, this is cumulative effect.
Question 3
1 / -0

In positive logic, the logic state $$1$$ corresponds to

A
positive voltage

B
zero voltage

C
lower voltage level

D
higher voltage level

Solution

In digital logic, higher voltage is defined as logic state '$$1$$' and lower voltage is defined as logic state '$$0$$'. The higher voltage need not necessarily be positive. For example, it is possible that state '$$0$$' is defined as $$-10\ V$$ and state '$$1$$' is defined as $$-5\ V$$.
Question 4
1 / -0

A strip of copper and another of germanium are cooled from room temperature to $$80\ K$$. The resistance of

A
each of these decreases.

B
copper strip decreases and that of germanium decreases.

C
copper strip decreases and that of germanium decreases.

D
each of these increases.

Solution

The conductors have positive temperature coefficient of resistivity and semiconductors has negative temperature coefficient of resistivity.
Hence, A strip of copper (conductor) and another of germanium (semiconductor) are cooled from room temperature to $$80\ K$$. The resistance of copper strip decreases and that of germanium increases.
Question 5
1 / -0

If ‘p’ region of a semi conductor is connected to negative and ‘n’ region to positive pole, it is said to be

A
directed biased

B
unbiased

C
forward biased

D
reverse biased

Solution

In reverse bias, 'p' region of a semi conductor is connected to negative pole and 'n' region to positive pole.
Question 6
1 / -0

Which of the following is not the function of a NOT gate?

A
Stop a signal.

B
Invert an input signal.

C
Complement a signal.

D
Change the logic in a digital circuit.

Solution

A NOT gate inverts the input signal which is the same as complementing a signal or changing the logic in a digital circuit. This means that when the input to the NOT gate is logic '$$0$$', the output is logic '$$1$$'. However, it does not stop a signal.
Question 7
1 / -0

When an input signal $$1$$ is applied to a NOT gate, its output is

A
$$1$$

B
$$0$$

C
either $$0$$ or $$1$$

D
both $$0$$ and $$1$$

Solution

NOT gate yields the reverse of the input signal in output, thus when an input signal $$1$$ is applied to a NOT gate, its output is $$0$$.
Question 8
1 / -0

NAND and NOR gates are called universal gates because they

A
are universally available.

B
can be combined to produce OR, AND and NOT gates.

C
are widely used in the integrated circuits.

D
can be easily manufactured.

Solution

The truth table for AND gate is as shown in the figure. Thus, the output of an AND gate is $$1$$ if and only if both inputs 'A' and 'B' are $$1$$.
Question 9
1 / -0

The energy band gap is maximum in

A
metals

B
super conductors

C
insulators

D
semiconductors

Solution

In insulators, the electrons are tightly bound with the nucleus hence, at room temperature thermal energy is not enough to push the electrons into conduction band and hence, no electrons are available for conduction. The energy required for electron to escape out from orbit and to over come the energy gap is thus of the order of $$6\ eV$$, while for semiconductors and conductors it is (of the order of) $$1\ eV$$ and $$0$$ respectively.
Question 10
1 / -0

Among the following one can act as the building blocks for the other gates is

A
NAND and NOR

B
NAND and AND

C
XOR and OR

D
NOT and OR

Solution

NAND and NOR gates are known as universal gates. Any one of these gates can be used to implement any kind of logic gate. This kind of feasibility is does not exist with other gates i.e. any other gate cannot solely implement all logic gates. For example, AND gate cannot be implemented using an OR gate and vice-versa. The implementation of NAND and NOR gates to generate other logic gates is shown above.

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Semiconductor Electronics: Materials, Devices and Simple Circuits Test 6

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Semiconductor Electronics: Materials, Devices and Simple Circuits Test 6

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SHARING IS CARING

Question 1

$$A = 0,\ B = 0$$

$$A = 1,\ B = 1$$

$$A = 1,\ B = 0$$

$$A = 0,\ B = 1$$

Solution

Question 2

shift of Fermi level.

cumulative effect of conduction band electron.

widening of forbidden gap.

high impurity concentration.

Solution

Question 3

positive voltage

zero voltage

lower voltage level

higher voltage level

Solution

Question 4

each of these decreases.

copper strip decreases and that of germanium decreases.

copper strip decreases and that of germanium decreases.

each of these increases.

Solution

Question 5

directed biased

unbiased

forward biased

reverse biased

Solution

Question 6

Stop a signal.

Invert an input signal.

Complement a signal.

Change the logic in a digital circuit.

Solution

Question 7

$$1$$

$$0$$

either $$0$$ or $$1$$

both $$0$$ and $$1$$

Solution

Question 8

are universally available.

can be combined to produce OR, AND and NOT gates.

are widely used in the integrated circuits.

can be easily manufactured.

Solution

Question 9

metals

super conductors

insulators

semiconductors

Solution

Question 10

NAND and NOR

NAND and AND

XOR and OR

NOT and OR

Solution

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