QUESTION BANK th Paper: - MECHATRONICS , (ME 6 Semester) Subject . Code:- ME-604B Discipline: ME [PART-A] Paper code: ME604B 1. Example of a 1st order system is a.Thermocouple b.Potentiometer c.RLC series Circuit d.Mercury inside the thermometer. 2. Semiconductor type Temperature sensor is a. RTD b. Thermistor c. Thermometer d. Pyrometer 3. Laplace Transform of Unit Step Function is 2 2 a. S b.1/S c. S d. 1/S 4. Input impedance of an Ideal Op – Amp is a. 0 b. 1 c. ∞ d. None of the above 5. 8085 Microprecessor is _______ bit processor a. 4 b. 8 c. 16 d. 32 6. Non Musk-able interrupt is a. RST 7.5 b. RST 6.5 c. TRAP d. INTR 7. PLC stands for a. Programmable Logic Controllers b. Programmed Logical Computing c. Programmable Logic Computing d. Programmed Logic Controllers 8. Z- Transform of a Impulse Function is a.0 b.1 c. ∞ d.None of the above 9.
Relation Between Proportional Gain (KP) & Pr oportional Band (PB) a. KP=PB b. KP= 1/ PB c. KP × PB= 0 d. None of the above. 10. A DC voltage source is connected across a series R-L-C circuit. Under steady state conditions, the applied DC voltage drops entirely across the a) R only b) L only c) C only d) R and L combination 11. Final value theorem is used to find the a) steady state value of the system output b) initial value of the system output c) transient behavior of the of the system output d) none of these 12. The Laplace Transform of the integral function of f(t) is ’
a) (1/s)F(s) b) sF(s)-f(0) c) F(s)-f(0) d) f (0) 13. 32. The inverse Laplace Transform of (1/s)(1-exp(-as))−−is a) u(t)-u(t-a) b) u(t) c) u(t-a) d) zero 14. The Laplace transform of a delayed unit impulse function δ(t-2) is -2s
a) 1 b) 0 c) e d) s 15. Which of the following is an inverse transducer ? a) LVDT b) Quartz crystal c) Loan cell d) Radiation pyrometer 16. Hall effect transducers are used for measuring a) Magnetic field b) Electric field c) Current d) Both a) & c) 17. Gauge factor of a strain gauge indicates its a) Accuracy b) Sensitivity c) Dead zone d) Dead time 18. Small linear displacement may be measured by a) Capacitive gauge b) LVDT c) Hall sensor d) Load cell ���� � �
19. The gauge factor of semiconductor strain gauge is in the range of a) 2 to 10 b)100 to 150 c) more than 200 d) 50 to 100 20. The gauge factor of semiconductor strain gauge is higher than the ordinary metal wire resistive strain gauge because of a) piezo-resistive effect b) temp. effect c) zener breakdown in the semiconductor metal d) its small size 21. Electrical resistance of a thermistor a) increases as the temp increases b) decreases as the temp increases c) remains unaffected with the change in temp. d) increases at low temp and decreases at high temp 22. Which of the following is a digital transducer ? a) Thermistor b) LVDT c) Encoder d) RTD 23. Self generating type transducers are a) active transducers b) passive transducers c) secondary transducers d) inverse transducers 24. The capacitive proximity sensor is used to detect a) the capacitance of an object b)the position of the object w.r.t. the sensor c) the natural frequency of the system d) the temp. of the system 2
25. The characteristic equation of a second order system is s + 6s+25 = 0. The system is a) underdamped b) overdamped, c) undamped d) critically damped 26. Time constant is defined as the time required for the response to reach a) 50% of final value, b) 63.2% of final value, c) 100% of final value, d) 10% of final value. 27. Which of the following controllers is not a continuous action type? (a) ON-off (b) proportional(c) Cascade (d) PID 28. The minimum number of NAND gages required to implement A+AB’ +AB’C is (a) 0 (b) 1 (c) 4 (d) 7 29. Convert (101111.1101) 2 into its decimal equivalent a) 46.8125 b) 47.7125 c) 47.8125 d) 48.8125 30. Convert (ABCD) 16 to binary. a) 1010001011101010 b) 1010101111001101 c) 1011101100101010 d) 1010101100101110 31. Convert A3B (Hex) to decimal. a) 2626 b) 2606 c) 2619 d) 2620 32. Convert 32(octal) to hex. a) 1A b) 1B c) 1C d) 1D 33. An XOR function is expressed as a) (AB)`+AB b) A`B+AB` c) AB+BA d)A`B`+AB 34. (A+B`+A`B)C = a) 1 b) 0 c) C d) C` 35. (A`+B)(A+B) = a) A b) B c) A` d) B` 36. A+A`B = a) A b) A+B c) A`+B d) A+B` 37. The invalid state of a NOR based S-R latch occurs when a) S=1, R=0 b) S=0, R=1 c) S=0, R=0 d) S=1, R=1 38. The invalid state of a NAND based S-R latch occurs when a) S=1, R=0 b) S=0, R=1 c) S=0,R=0 d) S=1,R=1 39. _________ F-F is used as a latcha) JK F-F b) SR F-F c) D F-F d) T F-F 40. The JK FF has toggle state whena) J=1,K=0 b) J=0,K=1 c) J=0,K=0 d) J=1,K=1 ���� � �
41. The 1’complement of 101010a) 010101 b) 101001 c) 111100 d) 111001 42. The 2’complement of 101010a) 010100 b) 010110 c) 111100 d) 101000 43. In the name of D F-F, D meansa) Design b) Delay c) Device d) none of these 44. In the name of S - R F-F ,S & R meansa) start - reset b)set-reset c)set - round d) none of these18. 45. Minimum number of NAND gates required to implement (A+AB’+AB’C’) (a) zero (b) one (c) four (d) seven 46. Minimum number of 2-input NAND gates that will be required to implement the function: Y= AB +CD + EF is a) 4 b) 5 c) 6 d) 7 47. A code used for labeling the cell of K-map is a) Natural BCD code b) Gray code c) Hexadecimal code d) octal code 48. The 1’s complement of 101101 a) 010110 b) 110001 c) 010010 d) 010011 49. The logical expression of XNOR gate is a) AB + (AB)` b) A`B` + (AB)` c) AB + A`B` d) A`B` + A` 50. Which is a universal gate a) OR b) AND c) XOR d) NOR 51. Thermocouples are a) active transducer b) passive transducer c) output transducer d) both a)& b) 52. A photo diod functions as a) photo conductive device with reverse bias b) photo voltaic device with reverse bias c) photo conductive device with forward bias d) as like LED 53. An Ideal Op-Amp has i/p resistance and bandwidth respectively a) infinity infinity b) zero infinity c) zero zero d) infinity zero 54. The flag register of 8085µP is a) 5 bit b) 12bit c) 8bit d) 16 bit 55. 1+A+AB+ABC+…………..= a) 1 b) ABC c) B d) A 56. In a D type latch, Enable input is high, D=1. The output will be a) 0 b) 1 c) don’t care d) blocked 57. The condition of a normal poppet valve is a) open b) close c) either open or close d) none 58. Inductive type Transducer is (a) Potentimeter b) stain gauge c) Tachometer d)LVTD 59. The resistance- temp, relationship for a resistance-tmp detectors (RTD’s) is gven by (a) Rt = Ro (1 + α t )
2
b) Rt = α t + bt
β / t
c) Rt = Ke
d) None of these
60. 1:n de-multiplexer should have m select line such that n
m
(a) 2 =m (b) (c) m=n d) None of these 2 =n 61. Proximity switches are to detect (a) Neaness of an object b) distance of an object c) whether the object comes in contact d) all of these 62. The ability of a transducer to give some output when used to measure a constant input over a period of time,is known as ���� � �
63.
64. 65. 66. 67.
68. 69.
70. 71.
72.
(a) sensitivity b) stability c) accuracy d) repeatibility Stepper motor is efficiently used in (a) Closed loop control systems b) open loop control systems c) Both (a) & (b) (d) None of these The device which converts one form of energy into another is called a a) Transistor (b) Transducer (c) PLC (d)Microcontroller In a critically damped system the damping factor of the system is a) Zero (b) Less than unity (c) unity (d) greater than unity Transfer function of a system is defind as the ratio of output to input in a) Laplace transform (b) Z-transform (c) Fourier transform (d) Single-algebraic transfom ASCII code is a) 4-bit code (b) 6-bit code (c) 7-bit code (d) 8-bit code (a)Diode (b)Thyristor (c)Triac (d)All of these Programme counter is a register of (a) 1 bit (b) 8bit (c)16bit (d) 64bit Flipflops are (a) Asynchronous tristate device (b) synchronous tristate device (c) ) synchronous bitable device (d)None of these Hoe many minimum numbers of NAND gates required realizing EX-Or gate? (a) 4 (b)5 (c) 6 (d) 3 Given a function f(t) whose Laplace transform is F(s) , the laplace transform of the first derivative of f(t) may be expressed as a) sF(s)-f(0) b) s(F(s)-f(0)) (c) F(s)/s (d) sF(s)-f’(0) Pressure can be measured by the use of a) The Bourdon Tube (b) Accelerometer (c) Tachometer (d)Encoder
73. The binary equivalent to ( 39 )d is (a) 100111 (b) 101001 (c) 111000 (d) None of these 74. A negative feedback system has a forward gain of 2 and feedback gain of 0.5, its close loop transfer function is (a) 1 (b) 2 (c) 0.5 (d) Infinity 75. The step response of a second order system settles to the steady state value within the least possible time and has no overshoot with(a) No damping (b) Underdamping (c) Critical damping (d) Overdamping 76. The velocity error constant of a system with open loop transfer function
77. 78. 79. 80.
5 s ( s + 5)
is
(a) 5 (b) 1 (c) 0 (d) Infinity Transfer function of a system is defind as the ratio f output to input in a) Laplace transform (b) Z transform (c) Fourier transform (d) Single algebraic transform In 8085 microprocesser, the addressable memory is (a) 64KB (b) 1MB (c) 4KB (d)16KB PSW is a _ register. (a) 8bits (b) 16 bits (c) 20 bits (d) 32 bits The value of the damping ratio for second order critically damped system is (a) ζ >1
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(b) ζ =1
(c) ζ <1
(d)None of these
PART-B MECHATRONICS Short answer type questions (Each carry five [5] marks) 1. What is Mechatronics? Explain with Block Diagram. 2. Construct the simplest logic circuit using NAND gates which will give the output as �� Q = ABC + ABC + ABC + ABC
5
3. Subtract using 1’s complement method. Also subtract using direct method and compare a) (1111)2 – (1010)2 b) (1000)2 – (1010)2 4. Subtract using 2’s complement method. Also subtract using direct method and compare a) (1000)2 – (1010)2 b) (1100)2 – (0101)2 5. Design Ex-OR gate using minimum number of NAND gates . 5 6. Simplify the expression Y = ∑ m ( 0,1, 2,3,5, 7,8, 9,11,14 ) using the K-map method. 5 7. Simplify the expression Y = ∏ ( 0,1,4,5,6,8,9,12,13,14 ) using the K-map method. 5 8. Implement FULL ADDER using half adder and other logic gates. (5) 9. Implement FULL SUBTRACTOR using half subtractor and other logic gates. 5 10. Draw the logic circuit diagram for a 2 to 1 line multiplexer and design a 4 to 1 line multiplexer using the 2 to 1 line multiplexer. 5 11. (a) What is a sequential logic circuit? How it is differ from combinational logic circuit? 22. Realized the following logic gates using 2 i/p NAND gates a) AND b) OR c) NOR d) X-OR (5) each 23. Realized the following logic gates using 2 i/p NOR gates a) AND b) OR c) NAND d) X-OR (5) each 24. Implement 8:1 multiplexer using logic gates 5 25. Implement 1:4 demultiplexer using logic gates 5 26. Implement 2:4 decoder using logic gates 5 27. Implement 3:8 decoder using logic gates 5 28. Describe the NOR based S-R latch with truth table. 5 29. Describe the NAND based S-R latch with truth table. 5 30. Discuss the NAND based J-K F/F with logic circuit and truth table. 5 31. Discuss the NOR based J-K F/F with logic circuit and truth table . 5 32. Discuss the NAND based D F/F with logic circuit and truth table. 5 33. What is the principle of a termocouple? What are the types of the thermocouple? State with neat sketches. 5 34. Write down a short note on Z-transform. Show the Z-transform of unit step function f(t)=u(t)=1 . 3+2 35. Explain the different Registers available in 8085 microprocessor. 5 36. In Binary system A=101101111 and B= 1000011010. Find the value of (A+B) and (A-B). 5 37. What is mechatronics .How dose it help in designing and manufacturing products? 38. With schematic dagram, make the comparative features betweew vane pump and gear pump. 39. State the charecteristics of stepper and brush less DC motor. 40. Compare between hydralic and pneumatic control circuit system. 41. Write short notes on operational amplifier and also state is applications. 42. What do yu meam by closed loop transfer function? Illustrate your answer. 43. Explain the Flags available in 8085 microprocessor. ���� � �
44. What is a D- fliplflop? How does it work as a latching device in 8085 microprocessor? 45. Distinguish between an open loop and a closed loop control systems with examplale. 46. Draw & explain the Block Diagram of 8085 Micro – Processor. 10 47. Discuss extrnal initiated signals in 8085 microprocessor? 48. What is check valve? Show various uses of a cheak valve in the hydraulic circuit. 49. What are the basic elements of a measurement system and sketch it block diagram? How do you define sensor? 50. State the difference between primary and secondary transducer? Define the term accuracy & precision? 51. Why sequential valves are necessary in pneumatic system? What is meant by cylinder sequencing? 52. Derive transfer function of P, PI, PD, PID control action and show the controller output curve with standard error input. 53. What are the types of field effect transistor?List down the feature of JFET. 54. List down the features of synchronous motor. What is a stepper motor? 55. What is the function of I/O module in a PLC? How many types of I/O modules are available in PLC. 56. Describe the basic functional blocks of a PLC. 57. What s the ladder diagram? What do you mean by the scan time of PLC? 3+2 58. Draw the ladder logic of logic gate NAND, NOR, X-OR , X-NOR . 59. What is PLC? Explain the operation of PLC with block diagram. 5 60. There are three machines, each with its own start and stop switch (Both are push button type switch). Only two of three machines can run at a time. Draw the PLC ladder program with appropriate interlocking. Mention Input output details for the ladder program. 61. Obtain he mechanical model of the mechanical systemshown below
62. Find the differential equations for the circuit shown below
5
5
63. Find the Laplace inverse of 1/(s 2+2s+5). 5 64. Reduce each diagram to a single block and hence determine the resulting equivalent transfer function by block diagram reduction techneque. 5
65. Wrie the 8085 assemblylanguage Program to exchange the contents of memory locations 2000H and 4000H. Show the i/os and o/ps condition before and after executing the program. 5 66. Write an ALP to add the content of memory locations 4000H and 4001H and store the result in memory location 4002H. Show the i/ps and o/ps condition. ���� � �
67. What is a mnemonic? Give an example. What is the opearting frequency of 8085? What is meant by the statement that 8085 is a 8-bit microprocessor? 2+1+2=5 68. Draw the pin configeration and functional pin diagram of µ P 8085. 69. List the various resisters of 8085 and mention teir function? 5 70. Give one example each of 1-byte, 2-bytes and 3-bytes instructions. 5 71. Give one example each of the different type of instructions in 8085 and explain. 5 72. Mention the interrupt pins of 8085. Explain maskable and non-maskable interrupts. Which is the nonmaskable interrupt for 8085? 2+2+1 73. Do the intrrupts of 8085 have priority of interrupts? What is meant by priority of interrupts? Mention the types of interrupts that 8085 supports. 2+2+1 74. What are the software interrupts of 8085? Mention the instructions, their hex codes and the corresponding vctor addresses. 75. Write different data transfer instruction in 8085. 76. Write diffeent jump instruction supported by 8085 µ P. 77. How the vactor address for a software interruptis determined? Writedown the instruction that load H-L register pair by the contents of memory location 3500 H. Then move the contents to register C. 3+2 78. In what way INTR is different from the other four hardware interrupts? 5 79. Explain the two instructions (a) LDAX and (b) STAX 5 80. Drwa the flow chart and write down the program toadd two numbers 16 H and D2 H. Stor the result in memory location 3015 H. 5 81. Write down the program to add two sixteen bits numbers. Draw the c orresponding flow chart. 82. Mention different common specification of a sensor/transducer. 5 83. Explain with diagram, bonded and unbonded types of stain gauges. 5 84. What is LVDT? What is the working principle of LVDT? 1+4=5 85. a) Describe the application of capacitive transducer. b) Mention the major applications LVDT as inductive transducer. 3+2 86. What are encoders as dgital displacement transducer? Describe the contacting resistive binary encoder operation with schematic. 1+4=5 87. What is the principle of Thermocouple? What are the Types of thermocouple? 3+2 88. Describe the operation of 8-bit absolute optical shaft encoder with schematic. 5 89. Describe the principle of working of technogenerater with schematic. 5 90. Describe the operation of Tactile sensor with necessary diagram. 5 91. Describe the operation of piezo electric transduser used for measurment of force. 5 92. Derive an expression for the closed loop gain of an op-amp used in invertive mode. 5 93. Derive an expression for the closed loop gain of an op-amp used in non-invertive mode. 5 94. Explain with circuit diagram how does an op-amp function as i) an inverter ii) a summer iii) subtractor iv) integrator v) differentiator. 5x5=25 −2
95. A Hall effect transducer is used for the measurment of a magnetic field of 0.5 Wb / m . The 2 mm thick slab is −6
made of Bismuth for which the Hall’s co-efficient is-1x 10 V m/ ( A − Wbm −2 ) and the current is 3 A. 5 96. What is check valve? Show various uses of a check valve in hydraulic circuit. 97. What is the application of counter balance valve? Draw a hydraulic circuit using counter balance valve. Long Answer type questions 1. a) Obtain the transfer function of armature control DC motor. What are the different types of Proximity sensors? ���� � �
c) Explain different types flow control valve used in hydraulic system. d) Explain servo-mechanism with diagram. (6+2)+4+3 =15 2. a) Explain how NOT,OR, AND gates ca n be realised using NOR gates. b) Explain XOR and NAND gate wih truth table. c) Use De-Morgan’s Law to show that NOR gates with inverted inputs is equivalent to an AND gate. 3+4+3 3. a) What is R-S flip-flop? What is its drawback? b) Explain how the drawback of R-S FLIP-FLOP can be overcome by J-K flip-flop. c) Explain how a 4-bt register can be realized using D flip-flop? d) Write a short note on multiplexer. e) What are the advantages of MOSFETs over simple junction transistor? 3+2+4+3+3 4. a)Along the necessary circuit diagram explain how 4 numbers of bonded gauges can be used for measuring force giving the highest sensitivity. b) How a thermostat can be used as a controller? c) What is piezoelectricity? How can it be used as force mesurment or pressure sensor? 6+4+5 5. State the basic purpose of PLC. Draw a ladder logic diagram where an electric motor to be run by using one open contact push button switch, one closed contact push button switch and a relay switch. 7 6. a) How that output voltage is proportional to mechanical strain f or small change in gauge resistance. 2 b) A resistance is bonded to a beam of 150 mm long and having a cross section of 5 mm and young modulous E= 200 Gpa. The strain gauge has a unstrained resistance of 220 Ω and gauge factor (GF) of 2 when a load is applied a resistance change by 0.013 Ω. Find the change of leanth of the beam and amount of force applied to beam. 7+8 7. a) Explain the working principle of stepper motor. b) Write short note on either Hall-effect sensor or tactile sensor. c) Sketch a recirculating ball-screw nut assembly and explain how the backlash can be eliminated. 5+5+5 10. a) State the role of sensors and transdecers in fe edback control systems. b) State the advantages of piezo electric type transducers over strain gauge type transducers. c)Describe the use of optical encoders in a mechatronic system. 3+3+4 11. a) Write a short note on adaptive control systems and types of different adaptive control circuits. b) What is a PID? Explain P, I, PID controller with related equation. C) What is transfer function? Prove that C(S)/R(S)=G(S)?[1+G(S)H(S)]whereC(S)= output,R(S)=input, G(S) = open loop transfer function ,H(S)= Feedback transfer function. 4(2+4)+5=15 12 a) Draw the schematic diagram of programmable registers of the 8085microprocessors. State the operations done by the constituent register. b)With an example, discuss the important of clock pulses in performing different operations of the 8085microprocessors. C) Write the ALP program for 8085 microprocessor that will add two numbers placed in two consecutive memory locations 2501 H and 2502 H. Store the result in another memory location 2503 H. 3+4+4+4=15 13. a) What is the purpose of pressure relief valve? Describe the operation with the help of a schematic diagram and also discusses the diffrence between pressure relief valve and pressure reducing valve. b) Design a hydraulic circuit which is to be utilized for drill work. The system utilizes two linear actuators-one for clamping job and another for drilling: i)Clamp Job ii) Drill the job iii) Retract the drill spindle iv) Unclamp the job. c) Discusses the principle of working of a solenoid control valve. (1+3+2)+6+3 =15 14. a)Find the poles and zeros of the following transfer function ���� � �
2
G ( S ) =
S + 3S + 2
( S + 4)( S 2 + 6 S + 25)
and sketch the pole-zero location.
b)Find the Z transform and region of convergence (ROC) for the signal. k X(K)= a u(k) where a is a real number and u(k)=1 for k>=0 =0 for k<0 5+ 10=15 15. a) A second order mechanical system is represented by the transfer function θ ( S ) =
1 2
( JS + fS + K )
. A step
input of 10 N-m is applied to the system and the result are given below: i)Maximum overshoot ii) Time at peak overshoot =1 sec. iii) Steady sate value of the output 0.5 rad. Determine the value of J,f and K. b) Simplify the Boolean function F(A,B,C,D) = ∑(0,1,2,6,8,9,10) using K map technique. 5+5=10 16. Obtain the transfer function of the mechanical system shown below and find force-voltage and force-current analogy circuit. 7+4+4=15
17. For the system i) & ii) write down the differential equation, and draw the electrical equivalent Circuit using Force- voltage analogy.
18. Give generalized second order system response to a unit step i/p. For the system below, with unit step input determine the 1. Charecteristic equation 2. Natural frequency of oscillation 3. Damped frequency of oscillation 4. Damping factor 5. Maximum overshoot 6. Time interval after which first maximum and first minimum peak will occure 7. Setting time for 2% tolerance band. 8+7=15
19. Reduce each diagram to a single block and hence determine the resulting equivalent transfer function by block diagram reduction techneque. 7+8=15
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20. Discuss pneumatic P-I and P-D and PID controller with a schematic. 5+5+5 21. Describe the principle of successive approximation type A/D converter. What are the advantages and disadvantages of this type of ADC. 6 +4 =10 22. (a) Explain the operation of R/2R D/A converter. (a) Explain the working of a successive approximation A/D converter. 7+8 =15 23. Implement 4:2 and 8:3 Encoder using logic gates 4+6=10 24. Discuss about different types of stain gauge with schematic. 10 26. What is Transducer? Where it differs with Sensor? What are the different types of Proximity Sensors. Explain one of them. 2+2+2+4=10 27. a) Discuss about the basic principle of parallel plate capacitive transducer. b) Show capacitnce-displacement curve of capacitive transd\ucer for change in plates area for linear and angular displacement. c) Dtermine the sencitivity of transducer for linear and angula displacement. 3+4+3=10 27. a)Discuss about the principle of cylindrical capaciter for capacitive transducer. 3+4+3 =10 b) Determine the sencitivity of this type of the cylindrical type capacitive transducer. c) Show capacitnce-displacement curve for change in distance for parallel plate capacitive transducer. 28. Discuss about the basic princple f LVDT with schematic diagram and describe the principle of operation. Show the ouput charecteristic curve of LVDT. 5+5 29. a) Discuss about the basic principle of Hall effect transducer with necessary diagram. b) Describe about the main thre applications of Hall Effect transducer. 5+3+2 =10 31. a)A capacitive transducer is made up of two concenstric cylindrical electrodes. The outer diameter of the inner cylindrical electrode is 3 mm and the dielectric medium in air. The inner diameter of the outer electrode is 3.1 mm. calculet the dielecttic stress when a voltage of 100 V is applied across the electrodes. Isit within safe limits? The length of electrodes is 20 mm. calculate the change in capacitance if the inner electrode is moved through a distance of 2 mm, the breakdown strength of air is 3m. 2
b) A capacitive transducer used two quartz diaphragms of area 750 mm seperated by a distance of 3.5 mm .A 2
pressure of 900 kN / m when applied to the top diaphram produces a deflection of 0.6 mm. the capacitence is 370pF when no pressure applied to the diaphragms. Find the value of capacitence after the application of a 2
pressure of 900 kN / m . 7+8 31. a) Describe the working and construction of resistance thermometer. b) Describe the materials used for RTDs, along with their propertics. c) Sketch the typical charecteristic of RTDs. 6+5+4=15 32. a) Descrbe the construction, theory and working of thermocouple. °
b) Draw the temperature emf curves for thermocouple withreferance junction at 0 C . c) Discuss about the advantages and disadvantags of thermocouple. 6+4+5=15 33. a) Explain the charecteristic of an ideal op-amp. Explain the functions of the different pin connection. ���� � ��
b) Mention the different propertics of an ideal op-amp. 4+3+3=10 34. (a) Explain any three sensors used for temperature measurement (b) Explain the following: Thermistors and Piezoelectric sensors 7+8=15 35. (a) Explain the working principle of stepper motor in half step mode (7) (b) Explain fluid system building blocks (8) 36. Discuss about the following actuation systems: (i) Self – excited wound field shunt configuration DC motor (ii) Self – excited wound field series configuration DC motor (iii) Stepper motor (iv) Induction motor 5x5 37. a)What are the various types of ball bearing ? Mention the application of each type. (7) (b) How will you specify a stepper motor? Explain the general characteristics of a ste pper motor. (8) 38. (a)Explain electronic proportional derivative (PD) controller with necessary circuit diagrams. (10) (b) Explain electronic proportional integral (PI) controller with necessary circuit diagrams. (10) 39. a) with a neat sketch explain the working principle of a recirculating ball-screw nut assembly and explain how the backlash can be eliminated. Give two examples where the above assembly is employed. 4+3 0 b) Determine the input pulse rate if the stepper motor has 10 per step and rotating at 30rpm. 3 40. a) Discuss the difference between pressure relieve valve & pressure reducing valve with help of schematic diagram. 4 b) Sketch and explain the shuttle valve. Draw the standard symbol for non-return type flow control valve and time-delay valve. 3+2 c) A Railway statio has three platforms A, B and C. A train is coming into the station. It has to be given entry to platform A if A is empty. If both A and B platforms are occupied by others trains then it has to be given entry to platform C. If all the platforms are full then the train has to wait. Design the necessary PLC ladder logic diagram along with electrical wiring with different types of I/Ps and O/Ps of PLC. 6
41. a) Explain different types of control valve used in hydraulic system. Explain the operation of single acting and double acting cylinder. b) Draw and explain the operation of a suitable hydraulic circuit in which an object is to be moved in both direction and in absence of any actuating force the object is in the neutral position. 6+4 +5 42. a) Explain different types of Direction control valve. b) Draw and explain the operation of a hydraulic circuit with proper symbol used to lift a mass of 2 tons using electrical actuations 10+5 43. (a) A work piece is loaded on a conveyor belt and operates between two limits of travel A and B. when limit switch at station A is activated, the conveyor moves forward. When limit switch at station B is activated, the conveyor changes direction. Pressing the start button causes the motor to run in the forward direction, and pressing the stop button the motor stopes. Create a ladder logic diagram and explain. (b) What are the main features of a PLC? 10+(5) 44. (a) Explain the architecture of a PLC and explain about its elements. (7) (b)A selection commetee comprises of 4 members including chairman. In order that a candidate be selected , he/she has to get support at least from 2 members. Chairman can select any candidate alone. If each member is provided with a switch, design PLC ladder logic with I/Os details which will on a bell when a candidate is selected. 7+8=15 44. a)what is PLC? What are the advantages of PLC in control system? How many types of PLC are available. b) Develop a ladder logic to fulfill the following condition:Level switch (LS1) turns On when the level is greater than high level (L1) . Start switch turns On the system. When level is below L1, pump is to be turned on. When level is above L2, pump has to be switched off. 2+ 3 + 2 + 8 = 15
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45.
a) State how a PLC works. Mention different componants of PLC. b)Write the advantages of PLC. c)There are three machines, each with its won start and stop switch (both are push button type switch).Only two of three machines can run at a time. Draw the PLC ladder program with appropriate interlocking. Mention input output details for the ladder program. 4+3+8=15 QUESTION BANK [PART-C] Paper: - MECHATRONICS, (ME-6th Semester) Subject . Code:- ME604 B ModuleI,II
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1. *Simplify the expression using Boolean algebra and show AB + ABC + A B + AB =0. 2. Implement 8:1 multiplexer using two 4:1 multiplexer and other basic logic gate.
5
5
3. Realize the logic expression Y = BC + AC + AB (a) using basic gates (b) using NAND gates only. 3+5= 8 4. Realize the logic expression Y = ( A + B ) ( A + C ) ( B + D ) (a) using basic gates (b) using NOR gates only. 3+ 5=8 5. Design a full adder using half adder and use external gate only. 10 6. Implement full adder using 3x8 Decoder. 5 7. *Simplify the following expression using K-map of 4 variable A,B,C,D. Verify the simplyfication using Boolean algebra.
y = m1 + m3 + m5 + m7 + m8 + m9 + m12 + m13
6+4 = 10
8. Obtain Minimal SOP for F (A, B, C, D) = ∑ m ( 1,3,4, 5, 9,11,14,15) using K-map . Draw the logic circuit for minimum SOP form using Basic gates. 5+ 3 = 8 9. Simplify the expression Y = ∏ ( 2,8,9,10,11,12,14 ) using the K-map method and implement minimal expression using logic gate.
5+3=8
10. Plot the logical expression ABCD + ABC D + ABC + AB on a 4- variable K-map ;obtained the simplified expression from the map. 10 11. What is the main problem in S-R F/F. How it can be eleminated with J-K F/F. Explain with logic circuit. 5 12. Draw Electronic (OP-AMP based) P controller and PI controller and find its gain value. 5+5 13. Draw Electronic (OP-AMP based) PD controller and PID controller and find its gain value. 5+5 ModuleIII 14. a) Write an ALP to add the content of memory location 4000H and 4001H and store the result in memory location 4002 and 4003H. Consider the result with carry output. b) Write an ALP to subtract the contnts of memory location 4001H from location 4000H and the place the result in memory location 4002H. 5+5 =10 15. a)*Write an ALP to copy a block of 5 data bytes stored starting from memory location C500H into the memory location starting from C600H. Show the i/ps and o/ps results. 5 b) What are the software interrupts of 8085? Mention the instructions, their hex codes and the corresponding vctor address. 5 16. a)Specify the register contents and the flag status (S, Z, CY) after the instruction ORA A is executed. [5] MVI A, A9H MVI B, 57H ���� � ��
ADD B ORA A b) Specify the register content and flag status as the following instructions are executed. Specify also the data at port 0. [5] MVIA,F2H Initial contents:-A=00H,B=FFH,S=0,Z=1,CY=0 MVIB,7AH ADD B OUT PORT 0 HLT Module IV 17. *Describe the potentiometer as displacement sensor and show the output charecteristic under ideal condition which is linearly related with the i/p displacement. 5 18. From the basic theory of the strain gauge prove that G f = 1 + 2γ , where G f =gauge factor, γ =poisson ratio. 10 19. *a)A resistance wire stain gauge uses a soft iron wire of small diameter. The gauge factor is +4.2. Neglecting the piezoresistive effects, calculate the Poisson’s ratio. b) A compressive force is applied to a structural member. The strain is 5 micro-strain. Two separate strain gauges are attached to the structural member , one is a nickle wire strain gauge having a gauge factor of -12.1 and other is nichrome wire strain gauge having a gauge factor of 2. Calculate the value of resistance of gauges after they are strained. The resistance of strain gauges before being strained is 120 Ω. 4+6 =10 20. a) A quartz piezo-electric crystal having a thickness of 2mm and voltage sensitivity of 0.055 V –m/N is 2
subjected to a pressure of 1.5 MN/ m . Calculate the voltage output.If the permitivityof quertz is
40.6 x10 −12 µ F / m calculate its charge sensitivity. 5 b) A quartz piezo-electric crystal having dimensions of 5 mm x 5 mm x 1.5 mm and a voltage sencsitivity of 0.055V-m/N is used for force measurment . Calculate the force if the voltage developed is 100V. 5 21. what is Bleed of hydrualic circuit.[4] Module V 22. Find the transfer function
E0 ( s ) Ei ( s )
of the following networks
23. Obtain the transfer function of the mechanical system shown below.
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6
10
24. The open loop transfer function of a system with unity feedback gain is given as G(s) =
20 s 2 + 5s + 6
.
Detemine the Damping ratio, Maximum overshoot, Rise time and peak time. 10
25. A closed loop systemis shown below. The system having the damping factor ξ = 0.7. Determine the value of K to satisfy the condition and calculate the settling time, peak time, Maximum peak overshoot for the value of K to be determined. 10
26. a)For a unity feedback system having O.L.T.F G(s) =.
k ( s + 2) s 2 ( s 2 + 7 s + 12 )
Determine i) Error constants ii) Steady
state error for parabolic input.. 5 b)Determine overall transfer function from the block diagram shown below 5
Module VI,VII,VIII 27. *State the characteristics of stepper motor and brushless DC motor.[5] 28. a)How the backlash can be eliminated in a recirculaing Ball Screw. [5]
b) Draw and explain the operation of a suitable hydraulic circuit in which an object is to be moved in both direction and in absence of any actuating force the object is in the neutral position. [5] 29. Compare the function of series wound D.C motors and shunt wound D.C motors.[5] 30. a)*Write a PLC ladder logic program for 4:1 Multiplexer with I/Os detail. b) write a PLC ladder logic program to implement the boolean expression Y=A(BC+D) with I/Os detail. 5+5
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Neeta Sahay (Subject Teacher), Sirshendu Saha (Subject Teacher)
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