ISRO Scientist or Engineer Electronics 2018

Instructions

For the following questions answer them individually

ISRO Scientist or Engineer Electronics 2018 - Question 71


For a feedback system shown below, If K: = 0 and K, = 5, then steady state error for unit ramp input is 0.2. What will be the new value of K: and Ka if damping ratio is increased to 0.5 without affecting steady state error:

Video Solution

ISRO Scientist or Engineer Electronics 2018 - Question 72


For a negative unity feedback system, Gain is given by
$$G(s) = \frac{0.25}{((s^2 + 1)(8s + 3))}$$
Transfer function of a lead compensator aimed at achieving gain crossover frequency of 0.5 rad/sec and phase margin of 30 deg is

Video Solution

ISRO Scientist or Engineer Electronics 2018 - Question 73


A sensitivity of transfer function $$T = \frac{(A_1 + kA_2)}{(A_3 + kA_4)}$$ with respect to parameter k is given by

Video Solution

ISRO Scientist or Engineer Electronics 2018 - Question 74


If over the course of a day, the maximum electron density in the ionosphere varies from $$10^{11}$$ to $$10^{12}$$ $$m^{-3}$$; the critical frequency changes approximately from:

Video Solution

ISRO Scientist or Engineer Electronics 2018 - Question 75


What is the peak to average power ratio for the signal $$x(t) = A \sin(\omega t)$$ with 50% duty cycle?

Video Solution

ISRO Scientist or Engineer Electronics 2018 - Question 76


A binary communication system receives equally likely symbols $$x_1(t)$$ and $$x_2(t)$$ plus Additive White Gaussian Noise at the input of matched detector. If the noise power spectral density ($$N_o$$) is $$10^{-11}$$ W/Hz, compute $$E_b/N_o$$ (in dB). Assume system characteristics impedance as 1Ω.

Video Solution

ISRO Scientist or Engineer Electronics 2018 - Question 77


x(t) = {
1, $$0 \leq t \leq T$$
0, Otherwise
}
h(t) = {
t, $$0 \leq t \leq 2T$$
0, otherwise
}
Calculate $$y(t) = x(t) * y(t)$$, where * denotes convolution for interval $$T \leq t \leq 2T$$

Video Solution

ISRO Scientist or Engineer Electronics 2018 - Question 78


Which of these is non-operational attribute of embedded system?

Video Solution

ISRO Scientist or Engineer Electronics 2018 - Question 79


For the below mentioned 8051 assembly code
Timeelapse : MOV RO, #100
Part 1 : MOVRI, #50
Part 2 : MOV R2#248
Part 3 : DJNZ R2, Part 3
: DJNZ R1, Part 2
: DJNZ RO, Part 1
Assumptions:
* Microcontroller is running at 12 MHz frequency and 1 machine cycle is having 12 clock cycles
* MOV instruction takes 1 Machine cycle
* DJNZ instruction takes 2 Machine cycle
Calculate time required for execution of Part 1

Video Solution

ISRO Scientist or Engineer Electronics 2018 - Question 80


A. Program Counter(PC) Pushedto Stack
B. Generate LCALLto ISR
C. Complete Execution of instruction in progress
D. Clear the interrupt flag
E. Set interrupt in progress
Correct order of execution of action taken by 8051 micro-controllers when an interrupt occurs:

Video Solution
cracku

Boost your Prep!

Download App