Process Control & Instrumentation Objective Questions – Set 1

Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an

In a single tank system, the transfer function of level to inlet flow rate is

Pick out the first order system from among the following.

Which of the following controllers has the least maximum deviation ?

Which of the following is a desirable characteristic of an instrument ?

Temperature measuring instruments are standardised mostly with __________ points of pure substances.

Dilute wine was used as a thermometric liquid initially to develop temperature scale. First emperical temperature scale developed was the __________ scale.

Pick out the one which is a first order instrument.

Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference ?

__________ is undesirable in thermocouples used in industries,

A negative gain margin expressed in decibels means a/an __________ system.

Volumetric expansion is the working principle of the __________ thermometers.

Which of the following temperature measuring instruments need not touch the object whose temperature is being measured ?

Which of the following is an undesirable dynamic characteristic of an instrument ?

Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a

A magnetic flowmeter is

Flapper nozzle is used in a/an __________ controller.

Change of angle of refraction with composition comprises the working principle of a

Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature ?

Working principle of radiation pyrometer is based on the

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

Flame photometry is used for the determination of compositional analysis of

Pick out the wrong statement.

Load cells are used for the measurement of

Which of the following measurements can be made by the measurement of emf ?

For two non-interacting first order systems connected in series, the overall transfer function is the __________ of the individual transfer functions.

Instrumentation in a plant offers the advantage of

Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit?

Smoke density of the flue gas going out of the chimney is measured by a

Compositional analysis of __________ is done using mass spectrometer.

The __________ of a vapor pressure thermometer is a functioning element.

Response of a system to a sinusoidal input is called __________ response.

The function of a transducer is to

Nichol's chart deals with

Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is

Strain gage pressure transducers are used to measure __________ pressures.

The closed loop pole of a stable second order system could be

A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if

The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C.

Thermal conductivity measurement com-prises the working principle of a

The operation of a rotameter is based on

Which of the following is the dynamic characteristics of an instrument ?

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

Which of the following is not the triple point of water ?

Zirconia probe is used for the continuous measurment of __________ flue gases going out of the furnace.

Select the correct statement from the following.

The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.

Typical specifications for design stipulates the gain margin and phase margin to be respectively

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

The __________ of a vapor pressure thermometer is a secondary element.