Instrumentation & Process control Mcqs

This set of Engineering Multiple Choice Questions & Answers (MCQs) focuses on “ Instrumentation & Process control ”. These Mcqs are chosen from a collection of most authoritative and best reference books on Chemical Engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Instrumentation & Process control comprehensively.

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16.
The temperature of a furnace falls at the rate of 180?F per hour. The instrument must not be in error by more than 9?F. What maximum time constant is permissible if the instrument has a first-order type response

3 minutes

1800 minutes

27 minutes

20 minutes

17.
What temperature has the same numerical value in Fahrenheit and Kelvin scales?

273.15?

574.6?

459.6?

491.6?

19.
Two thermometer one Centigrade and the other Fahrenheit are put in a beaker containing hot fluid. The reading on the Fahrenheit thermometer is found to be just three times the reading on the Centigrade thermometer. The temperature of hot fluid must be

100?

26.67?

80?

70?

20.
Ordinary mercury-in-glass thermometers are used to measure the temperature in the range of

?30? to 350?C

?20? to 1600?C

60? to 600?C

0? to 600?C

21.
Bimetallic thermometers are used to measure the temperature in the range of

?20? to 1600?C

0? to 400?C

60? to 600?C

800? to 1800?C

22.
Vapour pressure thermometers are used to measure the temperature in the range of

?20? to 1600?C

300? to 1100?C

800? to 2000?C

?20? to 300?C

23.
Iron-constantan thermocouple is used to measure the temperature in the range of

?20? to 1600?C

300? to 1100?C

0? to 600?C

600? to 1600?C

24.
Pt/Pt-13% Rh thermocouple is used to measure the temperature in the range of

0? to 600?C

600? to 1600?C

0? to 400?C

0? to 2000?C

25.
Radiation pyrometers are used to measure the temperature in the range of

800? to 2000?C

100? to 600?C

300? to 1100?C

0? to 400?C

26.
A constant-volume gas thermometer employing hydrogen gas is used to measure the temperatures

Less than 0?C

Between 0?C and 100?C

Greater than 100?C

B

27.
A constant-volume gas thermometer employing helium is used to measure temperatures

Less than 0?C

Between 0?C and 100?C

Greater than 100?C

A

28.
A constant-volume gas thermometer employing nitrogen is used to measure temperatures

Less than 0?C

Between 0?C and 100?C

Greater than 100?C

C

29.
Which of the following is the most suitable to measure a temperature of -250?C?

Constant-volume helium thermometer

Paltinum resistance thermometer

Radiation pyrometer

Ordinary mercury-in-glass themometer

30.
Which of the following is most suitable to measure a temperature of 2000?C?

Ordinary mercury-in-glass thermometer

Platinum resistance thermometer

Radiation pyrometer

Constant-volume hydrogen thermometer.

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