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Question 1 of 16
1. Question
Negative feedback in closed loop control system does not
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Question 2 of 16
2. Question
“A unity negative feedback system has the open loop transfer function
G(s) = K/[s(s+1)(s+3)]
The value of the gain K(greater than 0) at which the root locus crosses the imaginary axis is
Correct
Incorrect

Question 3 of 16
3. Question
The polar plot of the transfer function
G(s) = [10(s+1)]/s+10 for 0<=w< infinity will be in the
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Question 4 of 16
4. Question
A sinusoidal signal of 2kHz frequency is applied to a delta modulator.The sampling rate and step size of the delta modulator are 20,000 samples per second and .1V respectively.To prevent slope overload the maximum amplitude of sinusoidal signal in volts is (pi is constant 3.14)
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Incorrect

Question 5 of 16
5. Question
The damping ratio of a series RLC circuit can be expressed as
Correct
Incorrect

Question 6 of 16
6. Question
The built in potential of an abrupt pn junction is .75V.If its junction capacitance at a reverse bias of 1.25V is 5pF the value of junction capacitance in pF when Vr = 7.25V is
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Incorrect

Question 7 of 16
7. Question
A MOSFET in saturation has a drain current of 1mA for Vds = .5V.If the channel length modulation coefficient is .05 per V the output resistance os the MOSFET is
Correct
Incorrect

Question 8 of 16
8. Question
The open loop transfer function of a plant in a unity feedback configuration is given as
G(s) = [K(s+4)]/[(s+8)(s*s9)]
The value of gain K (>0) for which 1+j2 lies on the root locus is
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Incorrect

Question 9 of 16
9. Question
A lead compensator network includes a parallel combination of R and C in the feed forward path.If the transfer function of the compensator is
G(s) = (s+2)/(s+4) the value of RC is
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Incorrect

Question 10 of 16
10. Question
A plant transfer function is given as
G(s) = [Kp + Ki/s][1/{s(s+2)}]
when the plant operates in a unity feedback configuration the condition for the stability of the closed loop system is
Correct
Incorrect

Question 11 of 16
11. Question
The transmitted signal in a GSM system is of 200kHz bandwidth and 8 users share a common bandwidth using TDMA.If at a given time 12 users are are talking in a cell the total bandwidth of the signal received by the base station of the cell will be at least
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Question 12 of 16
12. Question
Let f(z) = (az+b)/(cz+d). If f(z1) = f(z2) for all z1 not equal to z2,a=2,b=4 and c=5 then d should be equal to
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Incorrect

Question 13 of 16
13. Question
The general solution of the differential equation dy/dx = (1+cos2y)/(1cos2x) is
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Question 14 of 16
14. Question
In an 8085 microprocessor which one of the following instructions changes the content of the accumulator?
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Question 15 of 16
15. Question
By performing cascading and/or summing/differencing operations using transfer function blocks G1(s) and G2(s) one cannot realize a transfer function of the form
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Incorrect

Question 16 of 16
16. Question
A unity negative feedback system has an open loop transfer function
G(s) = K/[s(s+10)]
The gain K for the system to have a damping ratio of .25 is
Correct
Incorrect
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