Which of the following thermocouples is the most suitable for measuring a temper

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Question
Which of the following thermocouples is the most suitable for measuring a temperature of about 1600�C in an oxidizing atmosphere?
Options
A. Platinum-platinum + rhodium
B. Iron-constantan
C. Copper-constantan
D. Chromel-alumel

Correct Answer

Platinum-platinum + rhodium

Process Control and Instrumentation problems

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1. Thermal wells are used in the temperature measurement to
Options
A. guard against corrosive and oxidising action on thermocouple materials
B. reduce measuring lag.
C. increase the fidelity.
D. increase the sensitivity.

2. Radiation thermometer can not measure the temperature
Options
A. inside a pressure vessel.
B. of an object without coming in contact with it.
C. of liquid oxygen.
D. of moving objects at high temperature.

4. A photo electric device in which the resistance of the metal is directly proportional to the light striking on it, is known as photo-conductive cell. Photoelectric transducers are used for the measurement of those parameters, which can be used to produce variation in
Options
A. light intensity
B. current
C. flux density
D. voltage

5. A system with a double pole at the origin is unstable since the corresponding term in the time domain
Options
A. is a constant.
B. grows exponentially with time.
C. grows linearly with time.
D. decays linearly with time.

6. To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with
Options
A. air
B. a metal powder or graphite
C. oil
D. mercury

7. Routh test
Options
A. criterion provides information about the actual location of roots.
B. cannot be used to test the stability of a control system containing transportation lag.
C. criterion is not applicable to systems with polynomial characteristic equation.
D. can not determine as to how many roots of the characteristics equation have positive real roots.

8. Continuous flue gas analyser makes use of paramagnetic properties of some of its constituents, which move towards the strongest part of the magnetic field thus displacing diamagnetic gases. Which of the following gases is diamagnetic?
Options
A. CO₂
B. O₂
C. NO
D. NO₂

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