# Electronics and Communication Engineering - Exam Questions Papers

1.
Compared to a p-n junction with NA = ND = 1014/cm3, which one of the following statements is TRUE for a p-n junction with NA = ND = 1020/cm3?
Reverse breakdown voltage is lower and depletion capacitance is lower
Reverse breakdown voltage is higher and depletion capacitance is lower
Reverse breakdown voltage is lower and depletion capacitance is higher
Reverse breakdown voltage is higher and depletion capacitance is higher
Explanation:
No answer description is available. Let's discuss.

2.
Which of the following are universal gates?
1. NAND
2. NOR
3. XOR
Select the correct answer from the codes given below:
1 and 2 only
1 and 3 only
2 and 3 only
1, 2 and 3
Explanation:
No answer description is available. Let's discuss.

3.
Consider the following statements:
To draw a.c. equivalent circuit of a transistors, all
1. d.c. sources are shorted
2. a.c. sources are shorted
3. d.c. sources are opened
4. a.c. sources are connected to d.c. sources
Which of the above statements is/are correct?
2 and 4
1 and 2
1 only
3 and 4
Explanation:
No answer description is available. Let's discuss.

4.
How many number of branches the root loci of the equation s(s + 2)(s + 3) + K(s + 2) = 0 have?
Zero
One
Two
Three