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ISRO Quiz 17
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Question 1
For a double hetero junction LED emitting light at a peak wavelength of 1.3 μm has radiative and non-radiative recombination time as 40 nsec and 120 nsec respectively, then the bulk recombination lifetime will be
Question 2
A message signal shown in below figure is applied to the AM modulator with modulation index 62%. If m(t) is a periodic signal then the modulation efficiency is
Question 3
Find ID(Q) of the MOSFET whose VT=4V, ID (on) = 5 mA at VGS (on) = 8V and VGS(Q) = 6.9V.
Question 4
A white noise process X(t) with two sided power spectral density 1 × 10-10 W/Hz is input to a filter whose magnitude squared response is shown below
The power of the output process Y(t) is given by
The power of the output process Y(t) is given by
Question 5
The impulse response of a linear time invariant system is H(n) = 
. The responses for the input signal x(n) = 
is
. The responses for the input signal x(n) = is Question 6
A radio channel has bandwidth of 10 kHz and an S/N ratio of 15 dB. The maximum data rate that can be transmitted is
Question 7
A digital filter has the transfer function 
where 
> 1 and 
. Assume that the filter is initially at rest. The initial and final values of the output when subjected to unit step input are ____ respectively
where > 1 and . Assume that the filter is initially at rest. The initial and final values of the output when subjected to unit step input are ____ respectively
Question 8
A sinusoidal signal with peak–to–peak amplitude of 1.536 V is quantized into 128 levels using a mid–rise uniform quantizer. The quantization noise power is
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ESE & GATE ECGeneralJul 4ESE & GATE EC
