Plastic Process Instrumentation and Process Control — Summer 2018

Explain thermistors?

Define Calibration & explain general steps to perform it.

Explain the block diagram of instrumentation process with neat sketch.

Define: Accuracy, Precision, Repeatability.

Define: Dead Zone, Reproducibility, Range & Drift.

Explain Open loop & closed loop control system with neat diagrams.

Write a short note feed forward & cascade control system.

1.Calibration is the process of _________by______ of the correct value of each scale reading on a meter. 2.The average deviation is an ___________ of the instruments.

List different types of pressure control system.

Define and describe static error, systematic error, random error.

1. What type of manometer is best for measuring pressure with absolute precision? 2. Apressure lower than atmospheric pressure is called ____________. 3.Bimetallic thermometers strips are made of two metals with different ____________.

Explain sources of error.

List the types of pressure transducers and explain the diaphragm pressure transducers with neat diagram.

1.1 atmospheric pressure (1 atm) = _________ psi. 2. Metals used in Bourdon tubes should not undergo

fatigue (b) hysteresis (c) creep (d) all the above. 3. One torr is equal to _____________.

Explain proportional controllers.

Explain about the construction and working of a strain – gauge pressure transducer with the help of a neat sketch. What are the advantages & disadvantages?

List the types of pressure transducers.

Describe piezoelectric pressure transducer.

Explain the diaphragm pressure transducers with neat diagram.1

What are the different methods of measure Extrudate thickness?

Explain Radiation pyrometer with neat sketch.

Explain about LVDT in detail.

Explain Ctype bourdon tube transducer.

Describe the advantages and disadvantages of filled system thermometer with neat sketch.

Write short note on thermocouples.