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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 2
41.
A material has conductivity of 105 mho/m and permeability of 4p x 10-7 H/m. The skin depth at 9 GHz is
1.678 μm
26 μm
17 μm
32.32 μm
Answer: Option
Explanation:

42.
A fair coin is tossed independently four times. The probability of the event "the number of time heads shown up is more than the number of times tails shown up" is
Answer: Option
Explanation:

4 heads and 0 tail 3 head and 1 tail

.

43.
The steady state error of a stable type 0 unity feedback system for a unit step function is :
0
∞
Answer: Option
Explanation:

.

44.
Find RTH across the terminals A and B
52.28 Ω
58.28 Ω
52.82 Ω
58.82 Ω
Answer: Option
Explanation:

There are not independent source in the circuit.

∴ The Thevenin and Norton equivalent will have 0 A and 0 V sources.

To find RTH, a 1 A source is connected as

Writing a nodal equations at n,

0.01Vx + 0.003Vx + 0.0067Vx = 1

0.017Vx = 1

∴ Vx = 58.82 V

45.
Find Y- parameters
None of these
Answer: Option
Explanation:

Apply Nodal Analysis

At node V

...(i)

At node V2

...(ii)

At node V3

∴

∴

Put V3 in equation (i)

Put V3 in equation (ii)

.

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