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.Management Sciences
Category: Process Control and Instrumentation
Smoke density of the flue gas going out of the chimney is measured by a __________________?
A. Polarograph
B. Thermal conductivity meter
C. Photo electric cell
D. Chromatograph
Out of the following temperature measuring instruments, the measurement accuracy will be minimum for the ________________?
A. Mercury in glass thermometer
B. Optical pyrometer
C. Iron-constantan thermocouple
D. Alcohol filled thermometer
Thermal conductivity measurement is used for the determination of________________?
A. O2 percentage in the flue gas
B. Specific gravity of petrofuels
C. Composition of an alloy
D. CO2 percentage in the flue gas
Phase lag of the sinusoidal response of a first order system is _________________?
A. 120°
B. 30°
C. 180°
D. 90°
When the damping co-efficient (ξ) is unity, the system is __________________?
A. Overdamped
B. Critically damped
C. Underdamped
D. Highly fluctuating
A bimetallic thermometer as compared to industrial mercury in glass thermometer has almost the same_________________?
A. Temperature measuring range (- 40°C to 450°C)
B. Accuracy (± 1% of span)
C. Speed of response
D. All a, b & c
The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an _____________ thermocouple?
A. Chromel-alumel
B. Iron-constantan
C. Platinum-platinum/rhodium
D. None of these
Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is________________?
A. Chromel-alumel
B. Iron-constantan
C. Platinum-platinum + rhodium
D. None of these
Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C ?
A. Mercury thermometer
B. Bimetallic thermometer
C. Radiation pyrometer
D. None of these
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