Process Control & Instrumentation Objective Questions – Set 1

Nichol's chart deals with

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

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 __________ of a vapor pressure thermometer is a functioning element.

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

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

Flapper nozzle is used in a/an __________ controller.

Instrumentation in a plant offers the advantage of

Volumetric expansion is the working principle of the __________ thermometers.

Flame photometry is used for the determination of compositional analysis of

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

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

The function of a transducer is to

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

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

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

Load cells are used for the measurement of

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

A magnetic flowmeter is

Pick out the one which is a first order instrument.

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

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

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

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

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

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

The operation of a rotameter is based on

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

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

Strain gage pressure transducers are used to measure __________ pressures.

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

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

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

Thermal conductivity measurement com-prises the working principle of a

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

Which of the following controllers has the least maximum deviation ?

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

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

Working principle of radiation pyrometer is based on the

Compositional analysis of __________ is done using mass spectrometer.

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

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

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

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

__________ is undesirable in thermocouples used in industries,

Pick out the first order system from among the following.

Pick out the wrong statement.

Select the correct statement from the following.

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