Semiconductor Electronics: Materials, Devices and Simple Circuits Test 68

Result

Semiconductor Electronics: Materials, Devices and Simple Circuits Test 68

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Question 1
1 / -0

Logic gate realised from pn junctions shown in figure is

A
OR gate

B
AND gate

C
NOT gate

D
NOR gate

Solution
Question 2
1 / -0

The Boolean expression for NOR gate is:

A
$$\overline { A.B } =Y$$

B
$$A+B=Y$$

C
$$A.B=Y$$

D
$$\overline { A+B } =Y$$

Solution
Question 3
1 / -0

Any digital circuit can be realised by repetitive use of only

A
NOT gates

B
OR gates

C
NAND gates

D
NOR gates

Solution
Question 4
1 / -0

If a,b,c,d are input to a gate and x is its ouput, then as per the following time graph, the gate is

A
NAND

B
NOT

C
AND

D
OR

Solution
Question 5
1 / -0

In the combination of the given gates the output $$Y$$ can be written in terms of inputs $$A$$ and $$B$$ as:

A
$$\overline { A.B } $$

B
$$A.\overline { B } +\overline { A } .B$$

C
$$\overline { A.B } +A.B$$

D
$$\overline { A+B } $$

Solution
Question 6
1 / -0

The following transistor circuit is equivalent to which logic gate ?

A
OR

B
NAND

C
XOR

D
AND

Solution
Question 7
1 / -0

Three NAND gates are used as shown in diagram and give a new logic gate. Then Boolean algebra for the new gate is

A
$$Y = A + B$$

B
$$Y = A . B$$

C
$$Y = \overline { ( A + B ) }$$

D
$$Y = \overline { ( A . B ) }$$

Solution
Question 8
1 / -0

In a forward biased $$P-N$$ junction carrying a certain amount of current, which of the following statement is false?

A
The depletion region width decrease in comparison to unbaised case

B
The electric field strength varies in depletion region

C
The neutral regions behave like ohmic reisters with small resistance.

D
The charge density in the depletion region is uniform.
Question 9
1 / -0

A p-n junction diode connected in series with a resistor of 200 $$\Omega $$ is forward biased so that a current 200 mA flows.If the voltage across this combination is instantaneously reversed at t=0, the current through diode is approximately,

A
400 mA

B
200 mA

C
100 mA

D
0 mA

Solution
Question 10
1 / -0

Which of the following circuits correctly represent the following truth table?

A

B

C

D

Solution