Exercise: Exam Question Papers
Questions for: Exam Question Papers
For dielectric to dielectric interface with surface charge density, which of the following statements are true?
- Dn2 - Dn1 = rs
- Et1 = Et2
- En1 = En2
Answer: B
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Thermal noise is passed through an ideal low-pass filter having cut-off at fc = ωHz. The auto correlation value of the noise at the output of the filter is given as
A:
Triangular function over the range 
B:
Gaussian over the range -∞ ≤ t ≤ ∞
C:
A Delta function at t = 0
D:
Sin c function over the range - ∞ ≤ t ≤ ∞
Answer: D
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Consider an AM system using a square law detector as shown in figure.
XC(t) = AC[1 + u x (t)] cos ωct, |ux(t)| << 1
The signal power at the output is :
XC(t) = AC[1 + u x (t)] cos ωct, |ux(t)| << 1
The signal power at the output is :
A:
A2Cu2 E[x2(t)]
B:
A2Cu2 E(x)
C: 
D:
None
Answer: A
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The input to a binary communication system, denoted by a random variable x, takes on one of the two values 0 or 1 with probabilities 
and 
. The behaviour of the communication system is modelled by
P(Y = 1 |x = 1|) = and P(Y = 0|x = 0) = 
Find P(Y = 1)
and . The behaviour of the communication system is modelled byP(Y = 1 |x = 1|) =
and P(Y = 0|x = 0) = Find P(Y = 1)
A: 
B: 
C:
1
D: 
Answer: B
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