This download link is referred from the post: GTU BE 2019 Summer Question Papers || Gujarat Technological University
Subject Code: 2182001
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-VIII(NEW) EXAMINATION - SUMMER 2019
Subject Name: Programmable Logic Controllers
Time: 10:30 AM TO 01:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1
- Explain functions of PLC I/O modules. (03 MARKS)
- List and explain any four advantages of PLC based control systems over conventional relay based control systems. (04 MARKS)
- Explain the factors to be considered at the time of PLC purchase. (07 MARKS)
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Q.2
- Explain advantages of remote I/O modules for PLC. (03 MARKS)
- Convert the following ladder logic (figure 1) into a Boolean equation, simplify the Boolean equation and convert back it to simplified ladder logic. (07 MARKS)
- Explain digital DC input module of PLC using suitable diagrams. (07 MARKS)
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OR
- Sketch the wiring for following outputs with a PLC. (03 MARKS)
- A 12V DC(PMDC) motor with forward and reverse operation
- A 230V, 1-phase AC lamp
- A 230V, 1-phase AC heater
- A 24V DC lamp
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- What is latching? Explain how latching is done in ladder network. (04 MARKS)
- Develop and draw Functional Block Diagram (FBD) program for the following application (07 MARKS)
When START push button is pressed momentarily, an output X will turn ON.
If another push button is pressed momentarily while X is on, another output Y--- Content provided by FirstRanker.com ---
will turn ON. When STOP push button is pressed momentarily, only X will
turn OFF. Y can be turned OFF by separate push button only if X is off
Q.3
- Give Instruction List (IL) program for the ladder diagram given in figure 2 (03 MARKS)
OR
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- Give IL program for the following Boolean expression (03 MARKS)
O=A(BC)+D(B+C)
Where O=digital output, A, B, C and D are digital inputs. - FirstRanker.com Give Instruction List (IL) program for the following Boolean expression (04 MARKS)
- Design and draw Functional Block Diagram (FBD) program for the following logic gates: (07 MARKS)
- Two input EX-OR gate
- Two input EX-NOR gate
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Q.4
- Design and draw Functional Block Diagram (FBD) program for the ladder diagram given in figure 2. (03 MARKS)
- Explain ON delay timer instruction for PLC with its timing diagram. (04 MARKS)
- Develop ladder diagram for the following operation: (07 MARKS)
A machine M is to be turned on either when 11 parts are sensed at position A
or when 16 parts are sensed at position B. One stop button resets the entire
process.
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OR
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- Using suitable diagram, explain DOWN counter instruction for PLC. (03 MARKS)
- Explain OFF delay timer instruction for PLC with its timing diagram and suitable example. (04 MARKS)
- Four outputs (Q, W, E and R) will be started when START push button is pressed. When STOP push button is pressed, Q and W will be stopped immediately. If STOP is pressed within 20 seconds of pressing START, then E will remain on for 5 seconds extra and R will remain on until another push button C is pressed (only if Q is not ON). But if STOP is pressed 20 seconds after pressing START, E will remain on until another push button D is pressed and R will be stopped immediately when Q is stopped. Develop and draw PLC ladder diagram to control the system. (07 MARKS)
Q.5
- In automatic temperature control system of fluid is to be controlled by PLC. An electric heater is used. The heater is operated by 230 V, single phase, AC supply. A temperature sensor is used to measure temperature of fluid. The sensor output is 0V to 10V DC for the temperature range of 0°C to 100°C. The sensor output is linear with the change in temperature. There is a START (NO) pushbutton and a STOP (NC) pushbutton. The system operates as follow:
- When START is pressed, initial temperature-will be recorded by PLC. - After 10 seconds, heater will turn ON and will remain ON for 1 minute.
- After waiting for 5 seconds, heater will turn ON again.
- The heater then will stop permanently when the temperature of the fluid exceeds 5 times than its initial temperature.
- When STOP is pressed at any-time, heater will be stop and can be restarted only after 30 minutes by pressing START once again.
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- Using suitable programming example, explain how two numbers are multiplied in PLC. (04 MARKS)
- Using suitable diagrams, explain Jump within Jump operation in PLC ladder diagram. (07 MARKS)
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OR
- Explain fail safe connection of start and stop switches with PLC with suitable wiring and ladder diagram. (03 MARKS)
- Explain data transfer (move) function in PLC. (04 MARKS)
- Design PLC ladder diagram for the following equation (07 MARKS)
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X=Y+2Y+3, Where X is analog output and Y is analog input.
- Explain various number comparison functions available in PLC programming. (04 MARKS)
Date: 15/05/2019
Total Marks: 70
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This download link is referred from the post: GTU BE 2019 Summer Question Papers || Gujarat Technological University
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