Electronics and Communication Engineering - Exam Questions Papers
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1.
Px(X) = M exp(- 2 |x|) + N exp(- 3 |x|) is the probability density function for the real random variable X, over the entire x axis. M and N are both positive real numbers. The equation relating M and N is
Answer: Option
Explanation:
Using property of probability density of Pxdx = 1
[M exp(- 2 |x|) + N exp(- 3|x|)]dx
1 ⇒ .
2.
The electric field component of a time harmonic plane EM wave travelling in a non magnetic lossless dielectric medium has an amplitude of 1 V/m. If the relative permittivity of the medium is 4, the magnitude of the time-average power density vector (in W/m2) is
Answer: Option
Explanation:
3.
The open loop transfer function of a unity feedback control system is given as
The phase cross over frequency and the gain margin are respectively.

Answer: Option
Explanation:
At phase cross over frequency
-90° - tan- 1 ωT1 - tan- 1 ωcT2 = - p
= 90°
GM = 1/a where a = | G(jω)|ω=ωc
.
4.
A unity negative feedback closed loop system has a plant with the transfer function
and a controller Gc(S) in the feed forward path. For a unit set input, the transfer function of the controller that gives minimum steady state error is

Answer: Option
Explanation:
so, Gc(s)|s → 0 should be maximum for low error = ∞
Gc(s)|s → 0.
5.
Find current i.


Answer: Option
Explanation:
The given circuit can be compared with Wheatstone's Bridge
∴Req = (10 + 10 + 10) || (10 + 10 + 10) = 30 || 30 = 15 Ω
.
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