JNTU
JNTU B.Tech IV PC BASED INSTRUMENTATION Previous Question Paper (May/June - 2019 - R15)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.
Part A
Compare PC/XT expansion card and AT expansion card.
Answer
The PC/XT expansion card uses an 8-bit data bus and a 20-bit address bus, whereas the AT (Advanced Technology) expansion card uses a 16-bit data bus and a 24-bit address bus, providing higher data throughput and expanded memory addressing capabilities.
Enlist the basic rules of plug in DAQ board design.
Answer
- Minimize noise interference by isolating analog and digital grounds.
- Ensure proper impedance matching for high-speed signal lines.
- Implement robust power supply decoupling using capacitors close to the IC pins.
- Maintain short trace lengths for sensitive analog signals to reduce crosstalk.
Discuss the number of input output modules in a PLC system.
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Draw the configuration of PLC High Speed counter.
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What is the advantage of cascading sequencers?
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Show the MULTIPLY function using Block Format.
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Draw the circuit symbols for outputs using (i) Timer (ii) Solenoid.
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What are the various motion and gripping capabilities in a industrial type robot?
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What is the drawback of ladder logic that forces the user to go for the use of other languages?
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Explain briefly the troubleshooting of PLC malfunction (any one).
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Part B
What are the reasons for the transmission problem from Transducer to Control room? Describe the signal flow from Transducer to Control room in detail.
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Explain the concept of Data Acquisition system with the help of neat block diagram.
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Enumerate how interfacing of input signals is done and also explain how continuous actuators are interfaced giving suitable examples.
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Give the brief overview of the PLC systems.
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Explain programming ON-OFF inputs to produce ON-OFF Outputs of a PLC with an example.
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Discuss the use of ADD function of PLC for a conveyer part count in an industry.
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Draw the ladder rung to represent (i) two switches normally open and both have to be Closed for a motor to operate. (ii) Either of two, normally open, switches has to be Closed for a coil to be engaged and operate an actuator.
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Illustrate the SKIP function by applying it to a production line.
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With the help of block diagram show how BCD devices and data are used by PLC.
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Explain the two axis robot with PLC Sequencer control.
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Show how PLC is incorporated in the Continuous Bottle-filling system.
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How does Proportional-Integral-Derivative control improve process control compared to Proportional-Integral control? Explain.
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List and explain various auxiliary commands and functions supported by PLC.
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Discuss the method of operation, structure and applications of HART protocol.
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