Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 7th Sem New 2171903 Computer Aided Manufacturing Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII(NEW) EXAMINATION ? SUMMER 2019
Subject Code:2171903 Date:27/05/2019
Subject Name:Computer Aided Manufacturing
Time:02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Abbreviations have usual meaning.
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
(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
(c) 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
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
(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
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
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII(NEW) EXAMINATION ? SUMMER 2019
Subject Code:2171903 Date:27/05/2019
Subject Name:Computer Aided Manufacturing
Time:02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Abbreviations have usual meaning.
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
(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
(c) 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
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
(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
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
2
OR
Q.5 (a) In block 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
Figure 1 Figure 3
Figure 2
*************
Machines A B C D E F G H I
1 1 1 1
2 1 1
3 1 1 1
4 1 1
5 1 1
6 1 1
7 1 1 1
Parts
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This post was last modified on 20 February 2020