Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech III VIRTUAL INSTRUMENTATION Previous Question Paper (November/December - 2018 - R15)
Note: This question paper contains two parts A and B. 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.
Part A
What is virtual instrumentation? Give some examples for virtual instruments.
Answer
Virtual Instrumentation is the combination of hardware and software that allows users to create custom-defined measurement and control systems. It uses a computer to mimic the functionality of traditional standalone instruments. Examples include digital multimeters, oscilloscopes, spectrum analyzers, and function generators implemented in software environments like LabVIEW.
Write various programming languages used in virtual instrumentation.
Answer
Common programming languages used in virtual instrumentation include:
- LabVIEW (G-language): A graphical programming language specifically designed for data acquisition and instrument control.
- C/C++: Used for low-level hardware interfacing and high-performance processing.
- Visual Basic/C#: Often used for building user interfaces and integrating with Windows-based applications.
- Python: Increasingly popular for its extensive libraries in data analysis and automation.
Write about structure of an array in VI.
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Explain about local and global variables used in VI with examples.
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What is DMA? Explain its applications and advantages.
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Write the functions of multiplexers S/H and counter/timers in a DAQ system.
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Write various types of signals in RS232C serial interface standard.
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Mention the PCI standard and its applications.
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Write about distributed I/O modules in VI toolsets.
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Write the applications of VI in motion control and its advantages.
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Unit I
Explain in detail some of the recent instrument technologies used for instrumentation.
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Discuss various programming techniques used in development of virtual Instrumentation and mention their merits and demerits.
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Discuss the graphical dataflow techniques and conventional data flow techniques used in virtual instrumentation.
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Discuss the advantages and applications of Virtual Instrumentation with suitable examples.
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Unit II
Write a VI to calculate sum of squares of N natural numbers using FOR and WHILE loops.
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State the use of a sub VI from a case structure and the case structure itself in VI.
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Explain the arrays, graphs and case structures used in VI programming with neat diagrams.
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Write about instrument drivers used in VI programming with examples.
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Unit III
Draw a neat schematic of a PC based data acquisition system and explain the working of various elements in detail.
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Explain the procedure for hardware and software installation of DAQ cards in VIs.
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Explain in detail how data acquisition is done in Lab VIEW.
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Explain the requirements of ADCs and DACs and timers and counters in PC based data acquisition.
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Unit IV
Explain the common interface standards used in VI and discuss the GPIB bus and its structure.
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Explain the SCSI and PXI interface bus standards with help of neat diagrams.
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Draw the schematic of RS 232C and USB bus standards and their features in detail.
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Discuss PCMCIA, VXI and PCI interface standards and compare their performance.
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Unit V
Discuss the steps involved in the development of process database management system.
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Explain in detail about distributed I/O modules with specific examples.
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Discuss various steps involved in simulation of development of control system with the help of a neat diagram.
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Explain in detail about applications of virtual instrumentation in motion control with typical examples.
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