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2003 Course Manufacturing Automation & Control

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Total No. of Questions : 12] P1322 [Total No. of Pages : 3 [3764]-173 B.E. (Production & Prod. S/W) MANUFACTURING AUTOMATION AND CONTROL (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any 3 questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) A single acting up stroking press having cylinder bore diameter of 350 mm and cycle time of 50 seconds has rapid approach of 200 mm in 8 sec. at 30 bars, pressing operation for 50 mm in 10 sec. at 300 bars and curing in 16 sec. Draw a suitable hydraulic circuit using accumulator and also calculate the size of accumulator and efficiency of circuit. The return is by gravity. [12] b) Explain with neat sketch the gear pump and also derive an expression for its flow. [6] OR Q2) a) Explain the procedure to design the reservoir used in hydraulic circuit. [10] b) Explain with neat sketch the circuit showing the application of deceleration valve. [8] P.T.O. Q3) a) A double acting cylinder is hooked up in the regenerative circuit. The relief valve setting is 100 bar. The piston area is 130 cm2 and the rod area is 65 cm2. If the pump flow is 95 l/min, find the cylinder speed and load carrying capacity for the extending and retracting stroke. [8] b) Draw a neat sketch and explain the working of sequencing circuit. [8] OR Q4) a) For a meter in hydraulic circuit, calculate the pump pressure required to achieve 50 bar pressure at full bore end of cylinder if the pressure loss across various elements is as below: Flow control valve = 12 bar, direction control valve (both side) = 4 bar, filter = 3 bar. [8] b) Sketch various types of cylinder mountings. [8] Q5) a) Explain with neat sketch the construction and working principle of two stage air compressor. [8] b) Draw a pneumatic circuit showing the application of twin pressure [8] valve and explain its working. OR Q6) a) Explain the working of FRL unit used in pneumatic system. [8] b) Draw a pneumatic circuit for a machine operated either by manual switch or automatic switch and to ensure that the work piece is properly clamped and door of the machine is not open. [8] SECTION - II Q7) a) What are factors required to be considered while selecting a microcontroller for a specific application? [8] b) Construct a ladder diagram for following Boolean equations: i) y = (x1 + x2 ) (x3 + x4 ) ii) y = x1 x2 [3764]-173 -2- [8] OR Q8) a) Explain with neat sketch various components of PLC. [8] b) Sketch the general architecture of microprocessor and explain the function of various parts. [8] Q9) a) Draw the neat sketches showing the control actions of various controllers and write the equations for their output. [10] b) What do you understand by accuracy and resolution of a digital to analog conversion? [6] OR Q10) a) Discuss the basic requirements of an interfacing circuit. b) Explain dual slope analog to digital converter. [8] [8] Q11) a) Explain the effect of part population, effect of speed, and effect of number of reciprocating strokes on the feed rate in case of reciprocating [12] fork feeder used in automated assembly systems. b) Explain various transfer mechanisms used in automated systems. [6] OR Q12) Write short notes on: [18] a) Centrifugal feeders. b) Robot configurations. c) Design for automated assembly. rrr [3764]-173 -3-

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