ISRO Scientist or Engineer Electronics 2018

Instructions

For the following questions answer them individually

ISRO Scientist or Engineer Electronics 2018 - Question 41


A four port directional coupler has 4 : 1 power splitting ratio and has dissipation loss of 3dB. The coupler directivity is 40dB. What fraction of input power P1 will go to ports P2 and P3?

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ISRO Scientist or Engineer Electronics 2018 - Question 42


A cell phone transmits at a powerlevel of 800 mW with an antenna gain of 3.0 dB. The cell tower has an antenna gain of 10.0 dB and is at a distance of 5 km away. Transmission frequency is 600 MHz. Noise level at Receiver Input is -95 dBm and required Signal to Noise ratio to close the link is 5 dB. Find the link margin in dB. (assume $$\pi^2 = 10$$)

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ISRO Scientist or Engineer Electronics 2018 - Question 43


What is the value of magnetic flux in Weber, if it is 2000 in Maxwell?

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ISRO Scientist or Engineer Electronics 2018 - Question 44


How resistance of Eureka varies with temperature?

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ISRO Scientist or Engineer Electronics 2018 - Question 45


A resistor R1 = 4 kΩ is connected across the secondary of transformer for which L1 = 0.2H, L2 = 10H and flux coupling coefficient k = 0.5. Find the peak voltage across resistor R1 when 250 V peak voltage at 400 rad/sec is applied to primary winding of transformer.

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ISRO Scientist or Engineer Electronics 2018 - Question 46


For a network shown in figure, Calculate current i2.

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ISRO Scientist or Engineer Electronics 2018 - Question 47


For a network shown in figure, a steady state is reached with switch k is open. Switch is closed at time t = 0. Calculate $$\left(\frac{di_1}{dt}\right)$$ and $$\left(\frac{di_2}{dt}\right)$$ at t = 0+

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ISRO Scientist or Engineer Electronics 2018 - Question 48


Signal flow diagram of following analog computer circuit is

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ISRO Scientist or Engineer Electronics 2018 - Question 49


Find the variance of the distribution shown in the figure.

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ISRO Scientist or Engineer Electronics 2018 - Question 50


Fourier transform of $$te^{-at} u(t)$$, (where a > 0, u(t) is the Unit step function) is :

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