ECE :: Exam Questions Paper
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A uniform plane magnetic wave incident normally on a plane surface of a dielectric material is reflected and the percentage of reflected power is 75% What is VSWR?
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Silicon is doped with boron to a concentration of 4 x 1017 atoms/cm3. Assuming the intrinsic carrier concentration of silicon to be 1.5 x 1010/cm3 and the value of
to be 25mV at 300K. Compared to undoped silicon, the Fermi level of doped silicon -
The Fourier series of a real periodic function has only
- Cosine terms if it is even
- Sine terms if it is even
- Cosine terms if it is odd
- Sine terms if it is odd
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A communication channel with AWGN operating at a signal to noise ratio SNR >> 1 and bandwidth B has capacity C1. If the SNR is doubled keeping B constant, the resulting capacity C2 is given by
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Power gain of antenna equals directive gain in VHF and UHF range if and only if efficiency of the antenna is __________ .
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A square in which each (i, j)th element of matrix is equal to the negative of the conjugate complex of (j, i)th element, is called
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The characteristic equation of a feedback control system is given by s3 + 5s2 + (K + 6)s + K = 0
where K > 0 is a scalar variable parameter. In the root-loci diagram of the system the asymptotes of the root-locus for large values of K meet at a point in the s-plane, whose coordinates are :
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, then it has 0 and 
HZ frequency component.
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