IndiaBIX

Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 5
26.
Find E at P(1, 1, 1) caused by four identical 3 nC point charges located at P1(1, 1, 0), P2(- 1, 1, 0), P3(- 1, - 1, 0) P4(1, - 1, 0)
21.58ax + 21.58ay + 12az V/m
6.82ax + 6.82ay + 32.89az V/m
-6.82ax - 6.82ay - 32.89az V/m
-21.58ax - 21.58ay - 12az V/m
Answer: Option
Explanation:

E = 6.82ax + 6.82ay + 32.89az V/m

r = ax + ay + az

r1 = ax + ay

r2 = - ax + ay

r3 = - ax - ay

and r4 = ax - ay

∴ r - r1 = az;

r - r2 = 2ax + az;

r - r3 = 2ax + 2ay + az

r - r4 = 2ay + az

= 6.8ax + 6.8ay + 32.9az .

27.
In the interconnection of ideal sources shown in the figure, it is known that the 60V source is absorbing power

Which of the following can be the value of the current source?
10 A
13 A
15 A
18 A
Answer: Option
Explanation:

Since 12A current is coming from one source and it is also known that 60V source is absorbing power i.e. current is flowing inside 60V source.

12 = x + 1 => I = 12 - x.

28.
For the network shown below, if VD = 12 V and VGSQ = - 2 V value of RS will be
13.35 kΩ
3.35 kΩ
33.31 kΩ
3.95 kΩ
Answer: Option
Explanation:

VGS = VG - IDRS

- 2 = 5.44 - 2.22 X 10-3 X RS

RS = 3.35 KΩ.

29.
The causal system given below is __________
minimum phase
maximum phase
mixed phase
none of these
Answer: Option
Explanation:

It has only zeros at origin. Hence it is minimum phase system.

30.
Find RL for maximum power transfer.
3 Ω
1.125 Ω
4.1785 Ω
None of these
Answer: Option
Explanation:

Use Y - Δ transformation

RAB= (9 || 18) || (9 || 18) = 3 Ω.

Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers