Process Control & Instrumentation Objective Questions – Set 6

Water is flowing through a series of four tanks and getting heated as shown in figure. It is desired to design a cascade control scheme for controlling the temperature of water leaving the tank 4 as there is a disturbance in the temperature of a second stream entering the tank 2. Select the best place to take the secondary measurement for the second loop.

Which of the following thermocouples is capable of measuring a temperature of -50°C?

Platinum resistance thermometer can be used upto antimony point which is __________ °C, and is the temperature of equilibrium between solid antimony & liquid antimony at normal atmospheric pressure.

Temperature measurement range of iron-constantan thermocouple is 0 to 870°C. It can be used to measure sub zero temperature, because at lower temperature

The level of a liquid under pressure can be determined using

Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are

Which of the following shows maximum dip effect (indicating reverse direction of temperature change) ?

Meleoid gauge measures the __________ pressure.

With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer

Bimetal strips are not used in

Maximum differential pressure in liquid manometer is __________ psi.

Cascade control means

__________ is an example of distributed parameter system

Liquid flow rate in an open channel can not be measured by a/an

Non-metallic diaphragm used as pressure sensor in instruments is generally made of

Bourdon tube is never made of

Thermisters which have a very high temperature co-efficient of resistivity belong to the class of solid called

Photoelectric pyrometers are suitable in the temperature range of __________ °C.

Liquid column manometers are used for measuring the pressure __________ kgf/cm² .

Flow rate measurement of hostile acids and alkalis can be most suitably done by a/an

Mcleoid gauge is used to measure the

A stable system is the one

Phase margin is equal to

Which of the following does not figure in the list of seven substances selected for international temperature scale ?

In a shell and tube heat exchanger, the outlet temperature of heating/cooling fluid is the __________ variable.

What is the Laplace transform of impulse input having magnitude 'X' ?

A non-linear system will have __________ steady state values.

The term analogous to voltage in a single tank system is the

Which of the following thermocouples has the widest temperature measurement range ?

Pyrometry refers to the measurement of temperature

"An emf of the order of mV is generated when two solutions of different hydrogen ion concentration are separated by a thin glass wall". This is the working principle of a

Routh test

The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since

The unit of 'time constant' of a system is the same as that of

The pressure sensing element of elastic type pressure gauge is never made in the form of a

Response of a linear control system for a change in set point is called

Which of the following is not classified as a thermo electric pyrometer ?

Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is

Compositional analysis of flue gas coming out of a furnace in respect of O² and CO²% can be continuously done by a/an

Thermocouple is suitable for measuring

Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability ?

Which of the following is never used as an element of industrial resistance thermometer ?

Hot wire anemometer is used for the measurement of

When the damping co-efficient (ξ) is unity, the system is

Silver point temperature is __________ °C.

Sub-zero temperature (< 0°C) can be measured by a constant volume gas thermometer employing

Which of the following is not a variable area flow meter ?