ISRO Scientist or Engineer Electronics Dec 2017

Instructions

For the following questions answer them individually

ISRO Scientist or Engineer Electronics Dec 2017 - Question 51


Consider the system with x(t) as input and y(t) as output. The frequency domain characteristics are shown in the figure. Which combination of A and B will give y as result?

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ISRO Scientist or Engineer Electronics Dec 2017 - Question 52


The $$R = \frac{1}{3}$$ convolution encoder defined by transfer functions
$$H_{1}(Z) =1+Z^{-1}$$
$$H_{2}(Z) =1+Z^{-2}$$
$$H_{3}(Z) =1+Z^{-1}+Z^{-2}$$

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ISRO Scientist or Engineer Electronics Dec 2017 - Question 53


The match filter response for given signal sampled at t = T is

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ISRO Scientist or Engineer Electronics Dec 2017 - Question 54


Characteristic equation of H(s) is given as $$3s^{4}+2s^{3}+5s^{2}+s+2=0$$ is

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ISRO Scientist or Engineer Electronics Dec 2017 - Question 55


Consider the feedback system 

$$G(s) = \frac{K(s + 4)}{s(s + 1)}  H(s) = \frac{1}{s + 2}$$

The value of gain for which system is marginally stable is

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ISRO Scientist or Engineer Electronics Dec 2017 - Question 56


Consider the Bode plots (magnitude and phase) of two different open loop transfer functions of two unity feedback systems. The open loop transfer functions have poles in right half plane. The closed loop system formed from these open loop systems. Which of the following holds true?

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ISRO Scientist or Engineer Electronics Dec 2017 - Question 57


The steady state response for an input X(s) = K/s to a system whose transfer function is H(s) in time domain is
$$H(s)=\frac{1}{(s+5)(s+2)}$$

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ISRO Scientist or Engineer Electronics Dec 2017 - Question 58


Consider a closed loop stable phase locked loop system as shown in the diagram below


The system is capable of producing zero steady state error E(t) for

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ISRO Scientist or Engineer Electronics Dec 2017 - Question 59


The modes in a reflex klystron

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ISRO Scientist or Engineer Electronics Dec 2017 - Question 60


A dielectric is subjected to alternating electric field. The dielectric losses are proportional to

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