Exercise: Exam Question Papers
Questions for: Exam Question Papers
Consider Continuous time system y(t) = 
x(t) - 
. For the system to be linear response ax1(t) + bx2(t) should be ay1(t) + by2(t) with relation between constant 'a' and 'b' as __________ .
x(t) - . For the system to be linear response ax1(t) + bx2(t) should be ay1(t) + by2(t) with relation between constant 'a' and 'b' as __________ .
Answer: D
Let ax1(t) + bx2(t) = m(t)
where m(t) is new input which causes the output n(t)
n(t) = m(t) -
n(t) = {ax1(t) + bx2(t)} -
add and subtract
n(t) = 
x1(t) -a + 
x2(t) -b +a +b -
n(t) =
+{a + b - 1}
n(t) = ay1(t) + by2(t) +{a + b - 1}
For linearity, n(t) = ay1(t) + by2(t)
∴ {a + b - 1} = 0 ∴ a + b = 1.
The effective modulation index is:
Answer: C
μ1 = 0.2 x 3 = 0.6
μ2 = 0.2 x 4 = 0.8
μ = (0.36) + (0.64) = 1.
A discrete random variable X takes values from 1 to 5 with probabilities as shown in the table. A student calculates the mean of X and 3.5 and her teacher calculates the variance of X as 1.5. Which of the following statements is true?
Answer: B
The mean is 3.
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 value of reflection coefficient at the interface is
A 30 GHz TE10 wave is incident on the air-dielectric interface. The value of reflection coefficient at the interface is
A: 
B: 
C: 
D: 
Answer: C
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