Smoke density of the flue gas going out of the chimney is measured by a __________________?
Correct answer: C. Photo electric cell
- A. Polarograph
- B. Thermal conductivity meter
- C. Photo electric cell
- D. Chromatograph
Explanation
Smoke density reduces the intensity of a light beam passing through the flue gas, so a photoelectric cell can detect the resulting change in light intensity. The other instruments measure electrical, thermal-conductivity, or composition-related properties.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
Practise Process Control and Instrumentation
254 free Process Control and Instrumentation MCQs from Chemical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemical Engineering questions like this
Chemical Engineering is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.
More Process Control and Instrumentation questions
Mercury manometer (U-tube type) exemplifies a ______________ order system?
Liquid argon level in a pressurised storage tank (at 3 kg/cm2) is measured by a/an ____________________?
E.m.f. generated by thermocouples is of the order of ________________?
Characteristic equation is the denominator of ____________ loop transfer function?
Measurement of sub-zero Celsius temperature in industry is done most commonly by __________________?
What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system ?