Semiconductor Electronics: Materials, Devices and Simple Circuits Test 18

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Semiconductor Electronics: Materials, Devices and Simple Circuits Test 18

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following symbol represents a universal gate?

A

B

C

D

Solution

A universal gate is that , by which we can get any logical Boolean expression or we can construct any basic gate . In the given gates option B shows a NAND gate , which is a universal gate . Whereas option A is a NOT gate , option C is a OR gate and option D is a AND gate , all three are basic gates .
Question 2
1 / -0

The energy gap between the valence band and the condition band for a material is $$6$$eV. The material is?

A
an insulator

B
a metal

C
an intrinsic semiconductor

D
a superconductor

Solution

Insulators have large energy gap between valence and conduction band (about $$6$$eV), while semiconductors have a smaller one and conductors, the smallest energy gap.
Question 3
1 / -0

Which gate can be obtained by shorting both the input terminals of a NOR gate?

A
NOT

B
OR

C
AND

D
NAND

Solution

The output of OR gate $$A + B = Y$$
The output of NOR gate
$$\overline {A + B} = Y$$
When, $$A = B$$, then
$$\overline {A + A} = \overline {A} = NOT$$ gate.
Question 4
1 / -0

Generally semiconductor can be used safely between the temperatures :

A
$$-75$$ and $$200$$

B
$$0$$ and $$75$$

C
$$-25$$ and $$300$$

D
$$-40$$ and $$1000$$

Solution

Semiconductor can be used safely between temperature $$0$$ and $$75$$.
Question 5
1 / -0

Symbolic representation of NOR gate is?

A

B

C

D

Solution

Symbolic representation of NOR gate is.
Question 6
1 / -0

The circuit given below represents which of the logical operations?

A
AND

B
NOT

C
OR

D
NOR

Solution

The circuit can be shown as in figure
The two gates shown are NAND gates
The output of first gate $${ Y }_{ 1 }=\overline { A.B } $$
The output of second gate $$Y=\overline { { Y }_{ 1 }.{ Y }_{ 1 } } =\overline { \overline { A.B } .\overline { A.B } } =\overline { \overline { A.B } } =A.B$$
Thus the given combination behaves as an AND gate.
Question 7
1 / -0

A semi conductor device with both active and passive electronic elements diffused into a silicon water to form a functional circuit is called.

A
Thin-film circuit

B
Integrated circuit

C
Hybrid-circuit

D
Thick-film circuit

Solution

Integrated circuits or $$I.C$$'s are those semi-conductor device with both active and passive electronic elements diffused into a silicon water to form a functional circuit.
Question 8
1 / -0

The n-side of the depletion layer of a p-n junction.

A
Always has same width as of the p-side

B
Has no bound charges

C
Is negatively charged

D
Is positively charged

Solution

The diffusion of electrons from n side to p side makes the n side of the depletion layer of pn junction positively charged since it becomes deficient in electrons and each side was neutral in the beginning.
Question 9
1 / -0

Which of the following gates will have an output of $$1$$?

A
$$D$$

B
$$A$$

C
$$B$$

D
$$C$$

Solution

The logic gate $$(C)$$ is a NAND gate for which the Boolean expression is $$X = \overline {0.1}$$.
We have $$X = \overline {0} = 1$$.
Hence option D is correct.
Question 10
1 / -0

The load voltage is approximately constant when a zener diode is

A
Forward-biased

B
Reverse-biased

C
Operating in the breakdown region

D
Unbiased

Solution

The zener voltage will be a constant only when it is operating in the breakdown region