Process Control Instrumentation Technology Questions answers - Set 07 - ObjectiveBooks

Process Control Instrumentation Technology Questions answers - Set 07

Practice Test: Question Set - 07


1. Vapor actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by
    (A) Making the volume of thermometer bulb as large as conveniently possible
    (B) Reducing the volume of the capillary to a minimum
    (C) Reducing the volume of the receiving element to a minimum
    (D) All 'a', 'b' & 'c'

2. Continuous measurement of specific gravity of a liquid is done by
    (A) Hydrometer
    (B) Contact-type electric indicators
    (C) Displacement meter
    (D) Both (a) and (c)

3. Gas chromatography is used for the measurement of
    (A) Temperature
    (B) Pressure
    (C) Concentration
    (D) Flow rate

4. Which of the following is not classified as a thermo electric pyrometer?
    (A) Resistance thermometer
    (B) Thermocouple
    (C) Optical pyrometer (disappearing filament type)
    (D) Radiation pyrometer

5. A system with a double pole at the origin is unstable since the corresponding term in the time domain
    (A) Is a constant
    (B) Grows exponentially with time
    (C) Grows linearly with time
    (D) Decays linearly with time

6. If response of a control system is to be free of offset and oscillation, the most suitable controller is
    (A) Proportional controller
    (B) Proportional-derivative (PD) controller
    (C) Proportional-integral (PI) controller
    (D) Proportional integral-derivative (PID) controller

7. Working principle of disappearing filament type optical pyrometer is based on the
    (A) Wien's law
    (B) Seebeck effect
    (C) Kirchoff's law
    (D) Peltier effect

8. Temperature measurement range of iron-constantan thermocouple is 0 to 870°C. It can be used to measure sub zero temperature, because at lower temperature
    (A) Emf produced is very low of the order of microvolt
    (B) Embrittlement of iron occurs
    (C) Rusting of iron takes place
    (D) Both (b) and (c)

9. Dilatometer is used to measure
    (A) Stress
    (B) Strain
    (C) Deflection
    (D) Contraction/expansion due to changes in temperature

10. For two non-interacting first order systems connected in series, the overall transfer function is the ________ of the individual transfer functions.
    (A) Product
    (B) Ratio
    (C) Sum
    (D) Difference

11. Relationship between absorption/evolution of heat at the thermocouple junctions and the current flow in the circuit is given by ________ effect.
    (A) Peltier
    (B) Thomson
    (C) Seebeck
    (D) None of these

12. Which of the following thermocouples is capable of measuring a temperature of -50°C?
    (A) Platinum-platinum + rhodium
    (B) Chromel-Alumel
    (C) Iron-constantan
    (D) Copper-constantan

13. pH meter has
    (A) One cell
    (B) Two cells
    (C) Three cells
    (D) No cell

14. Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively
    (A) - 273° & 80°
    (B) 0° & 80°
    (C) 32° & 460°
    (D) 32° & 80°

15. Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a
    (A) Magnetic flowmeter
    (B) Pitot tube
    (C) Flow nozzle type flowmeter
    (D) Turbine flowmeter

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