Process Control and Instrumentation in Oil and Gas Industry Questions - Set 08 - ObjectiveBooks

Process Control and Instrumentation in Oil and Gas Industry Questions - Set 08

Practice Test: Question Set - 08

1. Non-metallic diaphragm used as pressure sensor in instruments is generally made of
    (A) Teflon
    (B) Synthetic rubber
    (C) Bakelite
    (D) Thick paper

2. Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change?
    (A) Water
    (B) Mercury
    (C) Methyl alcohol
    (D) Carbon-tetrachloride

3. In second order underdamped system,
    (A) Decay ratio = overshoot
    (B) Decay ratio = (overshoot)2
    (C) Overshoot increases for increasing damping co-efficient
    (D) Large damping co-efficient means smaller damping

4. Which of the following filled system expansion thermometer has the capability to measure the lowest temperature?
    (A) Mercury in glass thermometer
    (B) Mercury in steel thermometer
    (C) Alcohol in glass thermometer
    (D) Fused metal (Na or K) in steel thermometer

5. Bimetal strips are not used in
    (A) Bimetallic thermometers
    (B) Thermocouples
    (C) Thermostats
    (D) Relays for opening & closing of electrical circuits

6. Emf generated in a thermocouple depends on the temperature
    (A) Of cold junction only
    (B) Of hot junction only
    (C) Difference between hot and cold junctions
    (D) Difference between cold junction and atmospheric temperature

7. A manometer measures the _________ pressure.
    (A) Atmospheric
    (B) Absolute
    (C) Gauge
    (D) None of these

8. Which of the following thermocouples can measure the maximum temperature?
    (A) Platinum-rhodium
    (B) Tungsten-molybdenum
    (C) Chromel-alumel
    (D) Iron-constantan

9. Compositional analysis of flue gas coming out of a furnace in respect of O2 and CO2% can be continuously done by a/an
    (A) Orsat apparatus
    (B) Thermal conductivity cell
    (C) Zirconia probe
    (D) Chromatograph

10. Optical activity of a solution can be determined using a
    (A) Polarimeter
    (B) Polarograph
    (C) Dilatometer
    (D) Refractometer

11. Mercury thermometer is commonly used for low temperature measurement. The freezing point and boiling point of mercury are respectively ________ °C.
    (A) - 39 and 350
    (B) - 51 and 439
    (C) - 79 and 395
    (D) - 10 and 425

12. Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in _________ in the electrical resistance of the wire.
    (A) No change
    (B) Decrease
    (C) Increase
    (D) Exponential decrease

13. A stable system is the one
    (A) For which the output response is bounded for all bounded input
    (B) Which exhibits an unbounded response to a bounded input
    (C) Which satisfies the conditions for a servo problem
    (D) None of these

14. Routh test
    (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) Cannot determine as to how many roots of the characteristics equation have positive real roots

15. Which of the following is not a composition measuring instrument?
    (A) Thermal conductivity cell
    (B) Mass spectrometer
    (C) Polarograph
    (D) Hot wire anemometer

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