What is Process Control and Instrumentation Practice Test - Set 19 - ObjectiveBooks

What is Process Control and Instrumentation Practice Test - Set 19

Practice Test: Question Set - 19

1. Which of the following controllers has the least maximum deviation?
    (A) P-controller
    (B) P-I controller
    (C) P-I-D controller
    (D) P-D controller

2. Bode stability method uses _________ loop transfer function.
    (A) Open
    (B) Closed
    (C) Either (a) or (b)
    (D) Neither (a) nor (b)

3. For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a
    (A) Large area but small mass
    (B) High thermal conductivity
    (C) Small specific heat
    (D) All 'a', 'b' & 'c'

4. For an input forcing function, X(t) = 2t2, the Laplace transform of this function is
    (A) 2/s2
    (B) 4/s2
    (C) 2/s3
    (D) 4/s3

5. Liquid levels in autoclaves are measured by
    (A) Simple float
    (B) Differential float type manometer
    (C) Glass gauge
    (D) None of these

6. The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly
    (A) Linear
    (B) Non-linear
    (C) Parabolic
    (D) Hyperbolic

7. Which of the following is the dynamic characteristics of an instrument?
    (A) Reproducibility
    (B) Sensitivity
    (C) Dead zone
    (D) Fidelity

8. Thermal conductivity cell is the primary element of a/an _________ analyzer.
    (A) Oxygen
    (B) Carbon dioxide
    (C) Carbon monoxide
    (D) Sulphur dioxide

9. The amplitude ratio for the sinusoidal response of a _________ is 1.
    (A) First order system
    (B) Second order system
    (C) Transportation lag
    (D) None of these

10. The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.
    (A) Chromel-alumel
    (B) Iron-constantan
    (C) Platinum-platinum/rhodium
    (D) None of these

11. Which of following error integral is considered as the best criterion in controller settings?
    (A) ∫0 |e| dt
    (B) ∫0 |e2| dt
    (C) ∫0 e2 dt
    (D) None of these

12. Which of the following is not a mechanical pressure sensing element?
    (A) Bellows
    (B) Diaphragm
    (C) Bourdon tube
    (D) U-tube

13. Zirconia probe is used for the continuous measurement of _________ flue gases going out of the furnace.
    (A) Oxygen in
    (B) Carbon dioxide in
    (C) Carbon monoxide in
    (D) Temperature of

14. Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion?
    (A) Nickel
    (B) Brass
    (C) Chromel
    (D) Invar

15. High temperature of around 2000°C of incandescent gas mantles is measured by a/an
    (A) Specially designed thermocouple
    (B) Optical pyrometer
    (C) Radiation pyrometer
    (D) None of these

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