Process Dynamics and Control Flashcards
This contains concepts and heuristics necessary for the development of process models in complex chemical engineering systems and the design of process control equipment.
Which of the following is an undesirable dynamic characteristic of an instrument ?
Time lag
Which of the following is not the triple point of water ?
32°R
Pick out the one which is a first order instrument.
All (a), (b) and (c).
Load cells are used for the measurement of
weight
Which of the following is the dynamic characteristics of an instrument ?
Fidelity
Pick out the wrong statement.
CO2is the strongest paramagnetic gas.
The ____ of a vapor pressure thermometer is a functioning element.
pointer
A negative gain margin expressed in decibels means a/an ____ system.
unstable
Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an
solid semi-conductor
Flapper nozzle is used in a/an ____ controller.
pneumatic
Typical specifications for design stipulates the gain margin and phase margin to be respectively
> 1.7 and > 30°
Working principle of radiation pyrometer is based on the
Stefan-Boltzman law
Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference ?
Thomson effect
Dilute wine was used as a thermometric liquid initially to develop temperature scale. First emperical temperature scale developed was the ____ scale.
Fahrenheit
In a single tank system, the transfer function of level to inlet flow rate is
R/(TS+ 1)
Which of the following is a desirable characteristic of an instrument ?
High fidelity
The operation of a rotameter is based on
variable flow area.
The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an ____ thermocouple.
iron-constantan
Instrumentation in a plant offers the advantage of
all (a), (b) and (c)
Which of the following temperature measuring instruments need not touch the object whose temperature is being measured ?
Radiation/infrared pyrometer
Thermal conductivity measurement com-prises the working principle of a
CO2analyser
Response of a system to a sinusoidal input is called ____ response.
frequency
The closed loop pole of a stable second order system could be
both real and negative.
Smoke density of the flue gas going out of the chimney is measured by a
photo electric cell