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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