ISRO Scientist or Engineer Electronics 2010

Instructions

For the following questions answer them individually

Question 41

The magnetic equivalent of Ohm’s Law is

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Question 42

It is required to design a class B output stage (as shown below) to deliver an average output power of 12.5W to a load of 4Ω. The power supply is selected so that $$V_{cc}$$ is 5V greater than the peak output voltage. Determine the power conversion efficiency, of the circuit.

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Question 43

Which type of circuit has an input impedance as shown in this polar plot?

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Question 44

A coaxial transmission line carrying an RF signalis perfectly matched to the load. Consider the cross-section of the line, at a plane where the instantaneousvoltageis at its maximum value. How will the curl of the E-field vary over this cross-section?

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Question 45

The continuity of the tangential field componentat the interface of two media for normal incidence of a plane wave requires

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Question 46

Which modeof a circular waveguide will have the lowest attenuation?

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Question 47

If $$\psi = 2x^{2}y - xz^{3}$$, then the Laplacian of $$\psi$$ is

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Question 48

What does the following integral evaluate to?
$$\int_{0}^{\frac{\pi}{2}} \sin^{6} \theta .d \theta$$

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Question 49

A signal with two frequency components at 6 kHz and 12 kHz, is sampled at the rate of 16 kHz and then passed through a Low Passfilter having a cut-off frequency of 16 kHz. The output signalof the filter

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Question 50

What is the greatest allowable PRF for unambiguous reception in a radar having a maximum range of 120 km?

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