ISRO Scientist or Engineer Electronics 2013


For the following questions answer them individually

Question 1

Determine the matched filter response h(t) for signal s(t) shown below:

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Question 2

A signal source with 100m wavelength is connected to the input terminals of a 150m long transmission line terminated in its characteristic impedance. The phase difference between the voltages at two ends of the transmission line in steady-state condition is :

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Question 3

A charge $$Q_2 = 8.854 \times 10^{-9} C$$ is located in a vacuum at $$P_2 (2,3,1)$$. The force on $$Q_2$$ due to a charge $$ Q_1 = 4 \pi \times 10^{-3} C$$ at $$P_1 (2,2,1)$$ is: (Note: All the coordinates are measured in Meters. $$a_x, a_y$$, and $$a_z$$ are unit vectors in X, Y and Z direction respectively.)

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Question 4

A low pass filter as shown in following figure is built using an operational amplifier having unity gain bandwidth of 1MHz. What is the bandwidth of this circuit ?

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Question 5

What is the frequency and duty cycle of output Y, when CLK frequency is 1 MHz @ 50% duty cycle?

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Question 6

For an isotropic radiator, electric field intensity at a distance R is measured as 3 V/m. What will be the electric field intensity at a distance 3R ?

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Question 7

The logic function implemented by following 4 :1 MUX is

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Question 8

Characteristic impedance of a two-wire transmission line at 1OKHz is 200-j50 ohms. Line is terminated in its characteristic impedance, and a 28.28V p-p signal is measured at its input. Determine the real power supplied by the signal source to the line?

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Question 9

Which is the correct waveform across capacitor in the following circuit?

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Question 10

Input voltage applied to a circuit is 1V rms and the output is 1 mV rms. Net gain of the circuit is:

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