Semiconductor Electronics: Materials, Devices and Simple Circuits Test 59

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Semiconductor Electronics: Materials, Devices and Simple Circuits Test 59

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Question 1
1 / -0

The given truth table is of
$$A\quad 0\quad 1$$
$$X\quad 1\quad 0$$

A
$$OR$$ gate

B
$$AND$$ gate

C
$$NOT$$ gate

D
None of these

Solution

For $$NOT$$ gate $$X=\overline A$$
Question 2
1 / -0

Given below are symbols for some logic gates
The $$XOR$$ gate and $$NOR$$ gate respectively are

A
$$1$$ and $$2$$

B
$$2$$ and $$3$$

C
$$3$$ and $$4$$

D
$$1$$ and $$4$$

Solution
Question 3
1 / -0

Given below are four logic fate symbol (figure). Those for $$OR, NOR$$ and $$NAND$$ are respectively

A
$$1,4,3$$

B
$$4,1,2$$

C
$$1,3,4$$

D
$$4,2,1$$

Solution
Question 4
1 / -0

A crystal diode is a

A
Non-linear device

B
Amplifying device

C
Linear device

D
fluctuating device

Solution

A crystal diode is a non- linear device. It doesn't Obey's ohms law.
Question 5
1 / -0

Which is the wrong statement in following sentences? A device in which $$P$$ and $$N-$$ type semiconductors are used is more useful then a vacuum type because

A
Power is not necessary to heat filament

B
It is more stable

C
Very less heat is produced in it

D
Its efficiency is high due to a high voltage across the junction

Solution

A device in which P and N type semiconductors are used is more useful then a vcacuum tube because its efficiency is high due to a high voltage drop across the junction.
Question 6
1 / -0

The output of a $$NAND$$ gate is $$0$$

A
If both input are $$0$$

B
If one input is $$0$$ and the other input is $$1$$

C
If both input are $$1$$

D
Either if both inputs are $$1$$ or if one of the input is $$1$$ and the other $$0$$

Solution

If inputs are $$A$$ and $$B$$ then out put for $$NAND$$ gate is $$Y=\overline {AB}$$
$$\Rightarrow $$ If $$A=B=1, Y=\overline {1.1}=\overline {1}=0$$
Question 7
1 / -0

Symbol

A
$$NAND$$ gate

B
$$NOR$$ gate

C
$$NOT$$ gate

D
$$XNOR$$ gate

Solution

It is the symbol of $$NOR$$ gate.
Question 8
1 / -0

GaAs is

A
Element semiconductor

B
Alloy semiconductor

C
Bad conductor

D
Metallic semiconductor

Solution

GaAs is a alloy semiconductor.
Question 9
1 / -0

Zener diode is used as

A
Half wave rectifier

B
Full wave rectifier

C
$$ac$$ voltage stabilizer

D
$$dc$$ voltage stabilizer

Solution

For a wide range of values of load resistance, the current in the zener diode may change but the voltage across it remains unaffected. Thus the output voltage across the zener diode is a regulated voltage. Hence, Zener diode is used as ac voltage stabilizer.
Question 10
1 / -0

The correct symbol for zener diode is

A

B

C

D

Solution