ISRO Scientist or Engineer Electronics 2012

Instructions

For the following questions answer them individually

Question 11

For Butterworth & Chebyshevfilters, the correct statementis :

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Question 12

In a feedback series regulator circuit, the output voltage is regulated by controlling th

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Question 13

In a fullwave rectifier circuit with centre tap transformer, if voltage between one end of secondary winding and centre tap is 300V peak, then PIV (peak inverse voltage)is

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Question 14

The rms value of the periodic waveform as shown in Figure is

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Question 15

The approximate equivalent resistance between terminals A and B for the following infinite ladder network comprising of 1Ω &2Ω resistors is:

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Question 16

If the step response to the input step amplitude of 1 V is given by $$V_{o}(t)=(1-e^{\frac{-t}{RC}})$$ the network can be represented by:

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Question 17

For a parallel RC circuit as shown in figure, R = 20 QN & C = 0.9 vF, which is to be matched to 50 Q over a bandwidth,

$$\int_{0}^{\infty} \ln \frac{1}{\mid r \mid} dw \leq \frac{\pi}{RC}$$


The circuit has to be matched over 6 GHz to 18 GHz, What is the  very best r that can be achieved:

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Question 18

In this circuit, V is a sinusoid input with freq f, current i contains:

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Question 19

The effect of phase error of local oscillator on spectral components in’ coherent detection of SSB Amplitude modulated signal is :

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Question 20

The maximum transmission power efficiency of DSB-C Amplitude modulation is:

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