abhimanyu projects

ECE 5th SEM IMP QUESTIONS

QUESTIONS Details

Jan 01, 2013 Posted by Abhimanyu

1)      Define transfer function.

2)      What are the basic elements used for modeling mechanical rotational system?

3)      Name two types of electrical analogous for mechanical system.

4)      What is block diagram?

5)      What is the basis for framing the rules of block diagram reduction technique?

6)      What is a signal flow graph?

7)      Write Definitions /Short Notes on:

System

Control System Reference Input

Output

Feedback element

8)      Classify Control system.

9)      Differentiate between Open Loop and Closed Loop Control System.

10) Explain importance of Feedback system.

11) Write the rules of Block Diagram Reduction.

12) Explain Mason’s Gain Formula.

13) Write the differential equations governing the Mechanical system shown in fig. and determine the transfer function.

14) Determine the transfer function Y2(S)/F(S) of the system shown in fig.

15) Find the overall gain of the system whose signal flow graph is shown in fig.

16) Draw a signal flow graph and evaluate the closed loop transfer function of a system

Whose block is shown in fig?

17) Derive the expressions and draw the response of first order system for unit step input.

18) Draw the response of second order system for critically damped case and when input is unit step.

19) Derive the expressions for Rise time, Peak time, and Peak overshoot. A potential control system with velocity feedback is shown in fig. What is the response of the system for unit step input?

20) For a unity feedback control system the open loop transfer function

G(S) = 10(S+2)/ S2 (S+1). Find

(a) Position, velocity and acceleration error constants.

(b) The steady state error when the input is R(S) where R(S) =3/s –2/s²+1/3s³

21) What is frequency response?

22) What are advantages of frequency response analysis?

23) What are frequency domain specifications?

24) Define Resonant Peak.

25) What is resonant frequency?

26) Define Bandwidth.

27) What is cut-off rate?

28) Define gain margin.

29) Define phase margin.

30) What is phase and Gain cross-over frequency?

31) What is Bode plot?

32) Define corner frequency.

33) What are the advantages of Bode Plot?

34) Sketch the Bode plot and hence find Gain cross over frequency, Phase cross over frequency, Gain margin and Phase margin.

G(S) = 0.75(1+0.2S)/ S (1+0.5S) (1+0.1S)

35) Sketch the polar plot for the following transfer function and find Gain cross over frequency, Phase cross over frequency, Gain margin and Phase margin.

G(S) = 400/ S (S+2) (S+10)

36) What is the necessary and sufficient condition for stability?

37) What is routh stability condition?

38) What is Nyquist stability criterion?

39) Using Routh criterion determine the stability of the system whose characteristics

equation is s⁴+8s³+18s²+16s+5 =0 .

40) Construct Nyquist plot for a feedback control system whose open loop transfer function is given by G(S)H(S) =5/ S(1-S).comment on the stability of open loop and

closed loop transfer function.

41) Sketch the Nyquist plot for a system with the open loop transfer function

G(S)H(S) =K(1+0.5S) (1+S) / (1+10S) (S-1).determine the range of values of K for which the system is stable.

42) What are state variables?

43) What is the state space?

44) What are phase variables?

45) What is a state vector?

46) Test the controllability & observability of the system whose state space representation is given as,

47) Determine the state variable representation of the system whose transfer function is

given as Y(s) / U(s) = 2s²+8s+7 / (s+2) ² (s+1)

1.   Explain indirect method of fm generation. What are the drawbacks of direct method..?

2.   (a) a differentiator circuit behaves like a fM slope detector .justify

(b)state 2 limitation of balanced slope detector

      3.What is agc?what are the advantages of delayed agc?

3.   Compare FDM and TDM?

     5.Explain crosstalk in PAM TDM system?

     6.Explain direct and indirect method of PDM?

     7.Compare s/n ratio of PAM and PDM?

     8.What are the disadvantages of delta modulationHowit can be removed?   Read More    |    Comments

ANTENNA

Jan 01, 2013 Posted by Abhi Raj

Q1. (a) Explain antenna action. Define any of its four parameters.

(b) An antenna has an effective height of 10m and the current at the base is 450A (rms) at 50 kHz. Calculate the power radiated. If the total resistance of the antenna system is 1.5 ohm find out the efficiency of the antenna.

(d) Show that the directivity of an alternating current element is 1.76dB.

(e) Find the Gain, beam width and capture area for a parabolic antenna with a 6 m diameter dish and dipole fixed at a frequency of 10 GHz.

Q2. (a) Classify various type of antenna array with example.

(b) Derive and draw the radiation pattern of two isotropic sources separated by a distance with an initial phase of 90 degree.

(c) With the help of pattern multiplication draw the radiation pattern of 4 element isotropic array separated by with the initial phase of 0 degree among them.

(d) Design Yagi-Uda antenna of 6 elements of provide gain of 10 dB if the operating frequency is 200 MHz

(e) Derive the radiation resistance of a antenna.

(f) Derive the field component of short electric dipole.

Q3. (a) Design a helical antenna operating in the axial mode that gives a directivity of 14 dB at 2.4 GHz. For this antenna, calculate the input impedance, half power beamwidth, BWFN, and the axial ratio.

(b) Determine the directivity of a loop antenna whose radius is 0.5m, when it is operated at 0.9MHz. Explain two of its applications.

Q4. (a) Why we use term modified refractive index in propagation of radio waves. In which type of propagation it is valid and what is its value?

(b) Explain the structure of ionosphere. Explain any two parameters of sky wave propagation.

Integrated Circuits

Jan 01, 2013 Posted by Abhi Raj

1.What is CMOS logic design? Why static power consumption is zero in CMOS logic design?

2.Realize the Half adder circuit using CMOS logic design.

3.Realize the full adder circuit using CMOS logic design.

4.Realize the function Z= A(B+C) using CMOS logic design.

5.Realize the function Z= A(B+CD)+B using CMOS logic design.

6.Design a NOR based SR latch in CMOS.

7.Design a NAND based SR latch using NMOS depletion load.

8.Design a NOR based D-FF in CMOS.

9.Realize AND, OR, NAND, NOR and NOT gate using CMOS logic design.

10.Realize the function Z= A+B(C+D) using CMOS logic design.

11.Draw the circuit diagram of 555 Timer and explain about it.

12.Design the Monostable multivibrator using 555 timer circuit and explain about it. Also derive the relevant expressions.

13.Design the Astable multivibrator using 555 timer circuit and explain about it. Also derive the relevant expressions.

14.Draw the block diagram of PLL and explain about it.

15.Draw the block diagram frequency divider circuit using PLL and explain about it.

16.Draw the block diagram amplitude modulator circuit using PLL and explain about it.

17.Draw and explain about the voltage controlled oscillator circuit.

18.How an Ex-OR gate can be used as a phase detector circuit.

Assignment Part 2

1. Draw and explain working of negative peak detector with the help of suitable diagram and waveform.

2. Draw and explain working of log amplifier.

3. With the help of multiplier IC realize the operation of multiplication and division.

4. How Schmitt trigger is removing errors of zero crossing detector? What are its advantages?

5. What do you mean by multivibrator circuit? What are different types of MV?

6. Analyze the performance of one shot MV. Derive the expression for time period.

7. Explain the function of Gyrator circuit.

EME

Jan 01, 2013 Posted by Abhi Raj

Q1. Explain the Meaning, nature and scope of Economics. Briefly explain the two major branches of Economics

Q2 Write down a 5 point of difference between macroeconomics and microeconomics.

Q3 Define engineering, science and Technology? How does the three contribute to the economic development of a country.

Q4 “Managerial economics is economics applied in decision-making.” Explain.

Q5.What is managerial economics? How does it differ from traditional economics?

Q6. Critically evaluate the impact of technology on the economic development of a country.

Q7. Explain the various functions and responsibilities of managerial economist

Q8 Write Short Notes on:-

a)   Engineering & Science

b) Sloping downward of Demand Curve

c) Various steps in demand forecasting.

d) The concept of Elasticity of Demand

e) External Economies



Q9. What do you mean by Returns to a scale? What are the applications of this law?

Q10. What do you mean by market? Briefly explain the various types of Market Structures.

Q11.   Explain the following concept:-

         (i) Price Elasticity of demand

         (ii) Income Elasticity of demand



Q12. Explain determinants of Demand. What is demand forecasting? What is its purpose & significance in business organization?

Q13 State the Law of variable proportion. What are the applications of this law?

Q14.    Economic Development of any country is closely associated with Science, Engg & technology. Elaborate this statement and elucidate the role of science, engg & technology in the economic development.

Q15 What useful information do these concepts of elasticity provide to the management?

Q16 Explain Internal Economies of Scale.

Q17     i) Fixed Cost

             ii. Variable Cost

            iii. Average Cost

          iv .Marginal Cost

Q18 Define Monopolistic Competitive market. What type of demand curve does a firm     have under Monopolistic Competitive Market?

Q19 Define Perfectly Competitive Market. What type of Demand Curve does a firm   have under perfect competition?

Assignment Questions

Q1 What useful information do these concepts of elasticity provide to the management?

Q2 Explain Internal Economies of Scale.

Q3       i) Fixed Cost

             ii. Variable Cost

            iii. Average Cost

          iv .Marginal Cost

Q4 Define Monopolistic Competitive market. What type of demand curve does a firm     have under Monopolistic Competitive Market?
Q5 Define Perfectly Competitive Market. What type of Demand Curve does a firm   have under perfect competition?

MICROPROCESSOR

Jan 01, 2013 Posted by Abhi Raj

Q1. Write a program to turn on and turn off the light for every 2 seconds. Use data bit D4 to operate the light. Also show the delay calaculation and assume system frequency 5Mhz.

Q2. Write a program to generate the square wave with a 200µs on period and 400µs off period. Also show the delay calaculation and assume system frequency 2Mhz.

Q3. Write a program to:

a)      Clear the accumulator.

b)      Add 45H

c)      Subtract 90H

d)     Add 64H

e)      Display the results after subtracting and after adding 64H.

Specify the answers you would expect at the output ports.

Q4.Write a program to load the bit pattern 91H in register B and 87H in register C. Mask all the bits except D0 from the registers B and C. If D0 is at logic1 in both registers, turn on the light connected to the D0 position of output port 01H; otherwise, turn off the light.

Q5. A set of eight data bytes is stored in memory location starting at XX50 H. Write a program to check each data byte for the bits D7 and D0. If D7 or D0 is 0, reject the data byte; otherwise, store the data bytes at memory locations starting at XX60hH.

Data(H) : 80,52,E8,78,67,35,62, F5

Q6. A set of eight data bytes is stored in memory location starting at XX50 H. Write a program to check whether a byte 40H exist in the set. If it does, stop checking and display its memory location; otherwise output FF H.

Data (H) : 48,32,F2,38,37,40,82,8A

Q7. Six bytes of data are stored in memory locations starting at XX60H. Write a program to add all data bytes. Use register c to save any carries generated, while adding the data bytes. Display the entire sum at two output ports.

Data (H): A2,54,A2,86,5B,25

Q8. Draw the flowchart to load the hexadecimal numbers 90 H and A5 H in registers D and E respectively and add the numbers. If the sum is greater than FFH, display 01H at port 0; otherwise, display the sum.

Q9. Write a program to provide the given on/off time to three traffic lights (Green, Yellow and Red) and two pedstrain signs(WALK and DON’T WALK). The signal lights and signs are turned on/off by the data bits of an output port as shown below:

Lights

Data Bits

On Time

1.      Green

D7

20 seconds

2.      Yellow

D6

10 seconds

3.      Red

D4

20 seconds

4.      WALK

D2

20 seconds

5.      DON’T WALK

D0

30 seconds

The traffic and pedestrain flow are in the same direction; the pedstrain should cross the road when the Green light is on.

Q10. Write a program to control a railway crossing signal that has two alternately flashing red lights, with a 1 second delay on time for each light.

Q11. Write a 20ms time delay subroutine using register pair BC. Clear the Z flag without affecting any other flags in the flag register and return to the main program.

Q12. Write a program to add the two hex numbers 7A and 46 and to store the sum at memory location XX98H and the flag status at location XX97H.

Q13. An 8bit binary no. is stored in memory location XX50H. Write a program to transfer the byte to the accumulator and Separate the two nibbles. Also call the subroutine to convert each nibble into ASCII hex code and Store the codes in memory location XX60H and XX61H.

Q14. A BCD no. between 0 and 99 is stored in an R/W memory location called the input buffer (INBUF). Write a main program and a conversion subroutine (BCDBIN) to convert the BCD no. into its binary equivalent. Store the result in a memory location defined as the output buffer (OUTBUF).

Q15. A set of six unpacked BCD no. is stored in memory locations starting at XX30 H. Assume the seven segment codes of the digits 0 to 9 for common cathode LED are stored in memory location starting at XX70 H. Write a program to select an appropriate seven segment code for each digit. The code should be stored in memory location in reverse order starting at XX90 H.

Q16.Calculate the delay in the following loop, assuming the system clock period is 0.5microseconds:

                                    LXI B, 12FF H      10

                  DELAY:   DCX B                   6

                                   XTHL                     16

                                   NOP                        4

                                   MOV A, C              4

                                   ORA B                    4

                                   JNZ DELAY           10/7

Q17. A set of ten packed BCD no. is stored in memory location starting at XX40 H.

i) Write a program to add these numbers in BCD. If a carry is generated save it in register B and adjust it for BCD. The final sum will be less than 9999_BCD .

ii) Write a second subroutine to unpack the BCD sum stored in register A and B and Store them in the memory location starting at XX60 H. (MSB at XX60 H and LSB at XX63 H)

Q18. With reference to Q17. Write a subroutine to convert the unpacked BCD digits stored at XX60 to XX63 H into ASCII code and store them at output buffer memory starting at XX80 H.

Q19. Write a program to subtract two packed BCD numbers (75- 36) stored in register B and C respectively. The minuend is placed in register C and subtrahend is placed in register B. Display the result at output port 0.

Q20. A binary number is stored in memory location XX50 H. Convert the no. into BCD and store each BCD as two unpack BCD digits in the output buffer (XX70 H). to perform the task, write a main program and two subroutines: one to supply powers of 10 and the other to perform the conversion.