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- Question 1 of 15
##### 1. Question

In an 8085 system, a PUSH operation requires more clock cycles than a POP operation. Which one of the following options is the correct reason for this?

CorrectIncorrect - Question 2 of 15
##### 2. Question

The open-loop transfer function of a unity-feedback control system is

G(s) = K/ (s*s + 5s + 5)

The value of K at the breakaway point of the feedback control system’s root-locus plot is

CorrectIncorrect - Question 3 of 15
##### 3. Question

The open-loop transfer function of a unity-feedback control system is given by

G(s) = K / [s(s+2)]

For the peak overshoot of the closed-loop system to a unit step input to be 10%, the value of K is

CorrectIncorrect - Question 4 of 15
##### 4. Question

The transfer function of a linear time invariant system is given by

H(s) = 2s4 -5s3 + 5s -2

The number of zeros in the right half of the s-plane is (read number after S as power for example s3 is cube of s)

CorrectIncorrect - Question 5 of 15
##### 5. Question

Consider a discrete memoryless source with alphabet

S = {S0,S1,S2,……}

and respective probabilities of occurrence P = {1/2,1/4,1/8,1/16,1/32,……}

The entropy of the source in bits is

CorrectIncorrect - Question 6 of 15
##### 6. Question

A digital communication system uses a repetition code for channel encoding/decoding. During transmission, each bit is repeated three times (0 is transmitted as 000, and 1 is transmitted as 111). It is assumed that the source puts out symbols independently and with equal probability. The

decoder operates as follows: In a block of three received bits, if the number of zeros exceeds the number of ones, the decoder decides in favor of a 0, and if the number of ones exceeds the number of zeros, the decoder decides in favor of a 1. Assuming a binary symmetric channel with crossover probability p = 0.1, the average probability of error isCorrectIncorrect - Question 7 of 15
##### 7. Question

An analog pulse s(t) is transmitted over an additive white Gaussian noise (AWGN) channel. The received signal is r(t) = s(t) + n(t), where n(t) is additive white Gaussian noise with power spectral density No/2 . The received signal is passed through a filter with impulse response h(t). Let Es and Eh denote the energies of the pulse s(t) and the filter h(t), respectively. When the signal-to-noise ratio (SNR) is maximized at the output of the filter (SNRmax), which of the following holds?

CorrectIncorrect - Question 8 of 15
##### 8. Question

An antenna pointing in a certain direction has a noise temperature of 50 K. The ambient temperature is 290 K. The antenna is connected to a pre-amplifier that has a noise figure of 2 dB and an available gain of 40 dB over an effective bandwidth of 12 MHz. The effective input noise temperature Te for the amplifier at the output of preamplifier is

CorrectIncorrect - Question 9 of 15
##### 9. Question

Two lossless X-band horn antennas are separated by a distance of 200λ. The amplitude reflection coefficients at the terminals of the transmitting and receiving antennas are 0.15 and 0.18, respectively. The maximum directivities of the transmitting and receiving antennas (over the isotropic antenna) are 18 dB and 22 dB, respectively. Assuming that the input power in the lossless transmission line connected to the antenna is 2 W, and that the antennas are perfectly aligned and polarization matched, the power ( in mW) delivered to the load at the receiver is

CorrectIncorrect - Question 10 of 15
##### 10. Question

Consider a system of linear equations

x-2y+3z = -1

x-3y+4z = 1

-2x+4y-6z=k.The value of k for which system has infinitely many solutions are

CorrectIncorrect - Question 11 of 15
##### 11. Question

A function f(x) = 1-x2+x3 is defined in closed interval [-1,1].The value of x in the open interval (-1,1) for which the mean value theorem is satisfied is

CorrectIncorrect - Question 12 of 15
##### 12. Question

A region of negative differential resistance is observed in current voltage characteristics of a silicon PN junction if

CorrectIncorrect - Question 13 of 15
##### 13. Question

In an 8085 microprocessor the shift registers which store the result of an addition and the overflow bit are respectively

CorrectIncorrect - Question 14 of 15
##### 14. Question

A 16KB memory array is designed as square with an aspect ratio of one (no of rows equal to no of columns).The minimum no of address lines needed for the row decoder is

CorrectIncorrect - Question 15 of 15
##### 15. Question

Consider a 4 bit D to A converter. The analog value corresponding to digital signals of value 0000 and 0001 are 0V and .0625V respectively.The analog value in volts corresponding to the digital signal 1111 is

CorrectIncorrect