ISRO Scientist or Engineer Electronics 2014


For the following questions answer them individually

Question 1

In the circuit shown below, switch S1 and S2 are in open and close position respectively for long time. At $$t = t_o$$, switch S1 is closed and switch S2 is opened. What would be the current through R1 immediately after the transition of switches?

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Question 2

A digital board has a unipolar square clock of 250MHz. If the clock on the board at all places should have all the harmonic components which have more than 10% of DC value, the board has to be designed forat least

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Question 3

A switch is connected in between a 12V battery and an uncharged capacitor and a 1 KΩ resistor. At the time instant when the switch is closed, the voltage across the capacitor is:

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Question 4

Which type of timing violation will occur, If a digital IC is operated at clock frequency which is higher than its specified maximum clock frequency?

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Question 5

If the maximum effective aperture of a radiating small loop of constant current is $$\left(\frac{3}{32 \pi}\right) m^2$$, the wavelength of the radiated electromagnetic wave is:

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Question 6

A radar system uses magnetron as high power RF source. Its transmitter emits 300kW RF power at 10% duty factor. If the efficiency of radar transmitter during pulse is 60% and the power required during pulse off period is 1 kW..The average power dissipation in radar is,

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Question 7

Match the following:

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Question 8

In a fiber-optic cable, which phenomenonoccursfor signal to propagate along the inner core:

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Question 9

Which of the following computation will take minimum number of clock cycles, if it is implemented on 8051 micro-controller? Following is variable declaration in c code:
unsigned int a, b;

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Question 10

Using a quarter wave transformer of characteristic impedance 1 Ω, a load impedance of 100 Ω will be transformed to an input impedance of value:

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