Process Control and Instrumentation Interview Questions - Set 12 - ObjectiveBooks
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Process Control and Instrumentation Interview Questions - Set 12

Practice Test: Question Set - 12


1. Which of the following thermometers is not suitable for distant reading upto 60 meters?
    (A) Vapor pressure thermometer
    (B) Mercury in glass thermometer
    (C) Constant volume gas thermometer
    (D) Resistance thermometer

2. Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are
    (A) Air to open valve with the controller direct acting
    (B) Air to close valve with the controller indirect acting
    (C) Air to open valve with the controller indirect acting
    (D) Air to close valve with the controller direct acting

3. The transfer function of a second order system is
    (A) 1/(T2s2 + 2ξTs + 1)
    (B) 1/(T2s2 + 2Ts + 1)
    (C) 1/(T2s2 + 2ξT + 1)
    (D) None of these

4. Thermal well made of _________ gives the fastest speed of response, while measuring temperature by thermocouples.
    (A) Steel
    (B) Vycor (a glass)
    (C) Nichrome
    (D) Inconel

5. Range of hydrogen gas constant volume thermometer is _________ °C.
    (A) -10 to 20
    (B) 0 to 100
    (C) 100 - 500
    (D) 400 - 1000

6. With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer
    (A) Increases
    (B) Decreases
    (C) Remain constant
    (D) Increases exponentially

7. In an exothermic chemical reactor, the manipulated variable is the flow rate of
    (A) Coolant
    (B) Reactants
    (C) Product
    (D) None of these

8. For measuring the temperature of a red hot furnace, which is the most suitable instrument?
    (A) Platinum resistance thermometer
    (B) Thermocouple
    (C) Optical pyrometer
    (D) Bimetallic thermometer

9. The fluid used in hydraulic controller is
    (A) Water
    (B) Steam
    (C) Air
    (D) Oil

10. Bourdon tube is never made of
    (A) Phosphor bronze
    (B) Monel metal
    (C) Stainless steel
    (D) Cast iron

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

12. Minute depression of freezing point of a liquid solvent on addition of a solid solute can be best measured by a
    (A) Beckman thermometer
    (B) Dilatometer
    (C) Mercury thermometer
    (D) Bimetallic thermometer

13. Degree to which an instrument indicates the changes in measured variable without dynamic error is called its
    (A) Speed of response
    (B) Reproducibility
    (C) Fidelity
    (D) Static characteristics

14. The pressure sensing element of elastic type pressure gauge is never made in the form of a
    (A) Bellow
    (B) Diaphragm
    (C) Strip
    (D) Bourdon tube

15. Temperature measurement by optical pyrometer is done above _________ point, which is 1063°C.
    (A) Antimony
    (B) Gold
    (C) Silver
    (D) Nickel

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