Electronics and Communication Engineering - Exam Questions Papers
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16.
Consider a parallel plate capacitor being charged. Identify the incorrect statements
Answer: Option
Explanation:
In a parallel plate capacitor, current passes through the connectors.
is the Poynting vector which points radially into the volume.
17.
Find equivalent resistance. Each resistance is l Ω


Answer: Option
Explanation:
Cut the cuboid at XY - AB plane. This will make two parallel and symmetrical loops. Resistance between XY and AB = 1 Ω Splitting it in two equal values resistances
Solving one of the loop
Use Δ - Y transformation
⇒ RP'Q' = + (1.6 || [1.2 + 2]) = 1.667 Ω
∴ Req = RP'Q' || RP'Q' =
.
18.
The following circuit is implementation of:

- sum of full adder
- carry of half adder
- difference of full subtractor

Answer: Option
Explanation:
Let the two bits be A and B. Then the truth table be:
Now it is evident from the truth tables that Sum and Difference are same.
19.
Find ZTH, VAB current through 10 Ω resistance


Answer: Option
Explanation:
Apply KCL at node A
VB = 5 x 1 5 V
∴ VAB = VA - VB = 1.33 - 5 = - 3.67 V
20.
The region between a pin of parallel perfectly conducting planes of infinite extent is y and z directions is partially filled with a dielectric as shown below.

A 30 GHz TE10 wave is incident on the air-dielectric interface. The VSWR at the interface is

A 30 GHz TE10 wave is incident on the air-dielectric interface. The VSWR at the interface is
Answer: Option
Explanation:
.
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