Subject Code: 2171903
GUJARAT TECHNOLOGICAL UNIVERSITY
--- Content provided by FirstRanker.com ---
BE - SEMESTER-VII(NEW) EXAMINATION — SUMMER 2019
Subject Name: Computer Aided Manufacturing
Time: 02:30 PM TO 05:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
- Abbreviations have usual meaning.
--- Content provided by FirstRanker.com ---
Q.1 (a) Give three points each on advantages and disadvantages of CAM. (03)
(b) Describe in short the types of manufacturing system used in industries. (04)
--- Content provided by FirstRanker.com ---
(c) Explain open-loop control system used in a CNC system with a schematic diagram (include the drawback and application). Draw a block diagram of velocity control loop for a closed-loop control system. (07)Q.2 (a) Draw a block diagram for retrieval type CAPP system. (03)
(b) Figure 1 shows a 4-axes horizontal machining center. Designate its axes. (04)
(c) Explain the principle of recirculating ball screw. Make a table of comparison between a conventional screw and a ball screw regarding load carrying capacity, travel speed, positioning, stiffness, friction, efficiency and maintenance. (07)
OR
--- Content provided by FirstRanker.com ---
Q.2 (a) First write a cut planning and then write a part program to drill a pattern of holes on a 15-mm thick plate as shown in Figure 2. Use subprogrm method. Cutting parameters are: tool number T02, speed 30 m/min, feed 50 mm/min. (Do not draw the given figure) (07)
Q.3 (a) When could you state that a manufacturing system is ‘flexible’? If there are any tests for checking this, name them. (03)
(b) Brief about functions of computers in FMS. (Any four) (04)
(c) What are the two major functions of tool monitoring systems? Explain various methods adopted for it. (07)
OR
--- Content provided by FirstRanker.com ---
Q.3 (a) Define PLC. Brief about the relay device components used in it. (03)
(b) State points on role of manufacturing engineers in the CIM environment. (04)
(c) Apply the rank order clustering technique to the PFA chart given in Figure 3. (07)
Q.4 (a) Define load capacity, degree of freedom, work volume for a robot system. (03)
(b) Write a brief note on position sensors used in robots. (04)
--- Content provided by FirstRanker.com ---
(c) Provide a comprehensive list of robot specifications with regard to (a) manipulator and (b) controller. (07)OR
Q.4 (a) Explain the PLC architecture using a diagram. (03)
(b) Enlist benefits of an FMS. State the associated limitations. (04)
(c) What are the different work-space configurations of a robot? Explain any two with neat figures. (07)
--- Content provided by FirstRanker.com ---
Q.5 (a) What do you understand by bill-of-materials and master production schedule as required in an MRP system? (03)
(b) What is MRP-II? Explain in brief. (04)
(c) Elaborate on JIT production systems. How are these usefully associated with FMS? (07)
Date: 27/05/2019
Total Marks: 70
--- Content provided by FirstRanker.com ---
Q.5 (a) Inblock number 60 of a part program a linear interpolation is required to a target point (25.40, 12.50, --10.00) with feed rate 200 mm/min and coolant on. Write this block in fixed sequential format, tab sequential format and word address format. (Coordinates are in millimeters) (03)
(b) A 200-step stepper motor is directly connected to a 5-mm pitch ballscrew. Calculate the resolution of the axis. Also calculate number of pulses required to move the axis by a distance of 70.275 mm. What shall be the pulse frequency to the stepper motor in order to achieve a linear velocity of 210 mm/min? (04)
(c) Enumerate types of problems commonly encountered in planning and control of production when traditional PPC is employed. (07)
Parts
Machines| A|B|C|D|E|F|G|H|I
--- Content provided by FirstRanker.com ---
1
Figure 1 Figure 3
v ¢ 10 through, 980 PCD
#1 #4 #5 #8 # #12
F==50.02
--- Content provided by FirstRanker.com ---
k 150.0 1
t 250.0 >
= — 300.0
Figure 2
--- Content provided by FirstRanker.com ---
This download link is referred from the post: GTU BE 2019 Summer Question Papers || Gujarat Technological University
--- Content provided by FirstRanker.com ---