SOME QUESTIONS FOR EC - TopicsExpress



          

SOME QUESTIONS FOR EC BRANCH...... ------------------------------------------------ 1. Modulo-2 addition is represented by (a ) F=x xor y (B) F=xy +x.ybar (C ) F=xy+ xbar .ybar (D) F= xy+x 2. The electric filel strength at any point equals a.the potential gradient at that point b. negative of the potential gradient at that point c. the charge at that point d. negative of the charge at that point 3. the laplace transform of a unit ramp funtion starting at t=a, is a). 1/(s+a)^2 b). e^-(as) /(s+a)^2 c). e^-as/s^2 d). a/s^2 4. for a poisson variata x; P(x=1) = P (x=2), the mean of x is a). 3 b). 4 c). 2 d).1 5. the 3dB band width means the frequency at which a.the open loop voltage gain reduced to 0.707 b.the open loop gain reduced to unity c.maximum voltage of a signal is without distortion d. it is medium wave band width of radio receiver 6. the noise figure of a receiver is a measure of a). excess noise generated b). bandwidth of the receiver c). gain of the receiver d). operating frequency 7). for a communication system, using coherent BPSK,it is necessary to keep the degradation due to phase error about 0.1dB or less. The phase error in degrees,the system can tolerate is a).9 b).5 c).6 d).7.1 ------------------------------------- targate.in
Posted on: Sun, 04 Aug 2013 03:18:19 +0000

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