Process Control Instrumentation Question Papers MCQs - Set 22 - ObjectiveBooks

Process Control Instrumentation Question Papers MCQs - Set 22

Practice Test: Question Set - 22


1. Continuous measurement of moisture in paper is done by
    (A) Sling psychrometer
    (B) Hair-hygrometer
    (C) Weighing
    (D) High resistance Wheatstone bridge circuit

2. Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature?
    (A) Platinum-platinum + rhodium
    (B) Iron-constantan
    (C) Chromel-constantan
    (D) All will give the same output

3. 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

4. Use of I-control along with P-control facilitates
    (A) Elimination of offset
    (B) Reduction of offset
    (C) Reduction of stability time
    (D) None of these

5. Flapper nozzle is used in a/an _________ controller.
    (A) Electronic
    (B) Hydraulic
    (C) Pneumatic
    (D) None of these

6. Polarograph is meant for the analysis of
    (A) Gaseous mixture
    (B) Miscible liquids
    (C) Solids
    (D) Isotopes

7. Which of the following judges the accuracy of an instrument?
    (A) Dead zone
    (B) Drift
    (C) Static error
    (D) None of these

8. Response of a system to a sinusoidal input is called _________ response.
    (A) Impulse
    (B) Unit step
    (C) Frequency
    (D) None of these

9. ________ controller has the maximum stabilizing time.
    (A) P
    (B) PD
    (C) PI
    (D) PID

10. The characteristic equation for the control system with a closed loop transfer function G1/1 + G2 is given by 1 + G2 = 0. The characteristic equation for the control system
    (A) Depends only upon the open loop transfer function
    (B) Determines its stability
    (C) Is the same for set point or load changes
    (D) All 'a', 'b' & 'c'

11. Compositional analysis of ________ is done using mass spectrometer.
    (A) An isotope
    (B) Natural gas
    (C) A solid
    (D) An alloy

12. A mercury barometer measures the _________ pressure.
    (A) Atmospheric
    (B) Gauge
    (C) Vacuum
    (D) Absolute

13. Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference?
    (A) Peltier effect
    (B) Thomson effect
    (C) Seebeck effect
    (D) None of these

14. The root locus method, a pole of a transfer function G(s) is the value of s for which G(s) approaches
    (A) -1
    (B) 0
    (C) 1
    (D) 

15. Liquid discharge from a tank or reservoir cannot be measured by
    (A) Orificemeter
    (B) Weirs
    (C) Mouthpieces
    (D) Notches

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