Process Control & Instrumentation Objective Questions – Set 6

Thermocouple is suitable for measuring

Bimetal strips are not used in

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

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

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

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

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

Pyrometry refers to the measurement of temperature

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

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

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

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.

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.

Hot wire anemometer is used for the measurement of

Routh test

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

Phase margin is equal to

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

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

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

Maximum differential pressure in liquid manometer is __________ psi.

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

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

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

Cascade control means

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

Meleoid gauge measures the __________ pressure.

Bourdon tube is never made of

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

__________ is an example of distributed parameter system

Mcleoid gauge is used to measure the

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

"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

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

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

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

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

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

A stable system is the one

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

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

Silver point temperature is __________ °C.

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

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

The level of a liquid under pressure can be determined using

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

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