Online Chemical Engineering Test - Process Control and Instrumentation Test 1

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Total number of questions: 20.
Time allotted: 30 minutes.
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Volumetric expansion is the working principle of the __________ thermometers.

mercury in glass

constant volume gas

vapor pressure

bimetallic

[#]

Compositional analysis of __________ is done using mass spectrometer.

an isotope

natural gas

a solid

an alloy

[#]

A magnetic flowmeter is

based on the principle of Faraday's law.

capable of measuring the flow rate of slurries and electrolytes.

based on the linear relationship between the fluid flow rate and the induced voltage.

all (a), (b) and (c).

[#]

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

pointer

Bourdon tube

bulb

none of these

[#]

The transfer function for a P-D controller is

K_c(1+τ_D s)

K_c(1 +1/τ_D s)

K_c τ_D s

K_c/τ_D s

[#]

High temperature of around 2000°C of incandescent gas mantles is measured by a/an

specially designed thermocouple.

optical pyrometer.

radiation pyrometer.

none of these.

[#]

What is the dynamic error in a critically damped second order instrument for a ramp input (At) ?

0.5 AT

2 AT

1.5 AT

[#]

Emf generated in a thermocouple depends on the temperature

of cold junction only.

of hot junction only.

difference between hot and cold junctions.

difference between cold junction and atmospheric temperature.

[#]

__________ stability method uses open loop transfer function.

Nyquist

Mikhalov

Ruth

none of these

[#]

10.

Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity ?

CO₂

N₂

O₂

[#]

11.

Mercury thermometer can be used to measure the temperature upto __________ °C.

100

250

350

750

[#]

12.

Liquid levels in autocalves are measued by

simple float

differential float type manometer

glass gauge

none of these

[#]

13.

Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is

water

carbon tetrachloride

paraffin

ethylene glycol

[#]

14.

Which is the symbol for "pneumatic control valve" ?

none of these

[#]

15.

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

orsat apparatus

thermal conductivity cell

zirconia probe

chromatograph

[#]

16.

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

400-1600

800-1600

800-2500

400-1000

[#]

17.

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

[#]

18.

Gain margin is equal to the

amplitude ratio

reciprocal of amplitude ratio

gain in P controller

gain in P-I controller

[#]

19.

A manometer measures the __________ pressure.

atmospheric

absolute

gauge

none of these

[#]

20.

A first order system with unity gain and time constant τ is subjected to a sinusoidal input of frequency w = 1/τ. The amplitude ratio for this system is

0.5

1/2

0.25

[#]

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Online Chemical Engineering Test - Process Control and Instrumentation Test 1

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