- A. 961.93
- B. 630.74
- C. 1064.43
- D. 1261.93
Process Control and Instrumentation
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Platinum resistance thermometer can be used upto antimony point which is ______ °C, and is the temperature of equilibrium between solid antimony & liquid antimony at normal atmospheric pressure.
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Time constant is the_____.
- A. Time taken by the controlled variable to reach 63.2% of its full change
- B. Same as transportation lag
- C. Same as dead time
- D. Time required by the measured variable to reach 63.2% of its ultimate change
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Phase margin is equal to_____.
- A. 180° – phase lag
- B. Phase lag – 180°
- C. Phase lag + 180°
- D. Phase lag + 90°
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Which of the following is not a second order instrument?
- A. Mercury in glass thermometer with covering
- B. Bare mercury in glass thermometer
- C. Pressure gauge with one bellow, two tubes and a tank
- D. None of these
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Composition of natural gas is determined by the_____.
- A. Haldane apparatus
- B. Mass spectrometer
- C. Chromatograph
- D. Both B and C
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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
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Thermodynamic celcius scale of temperature measurement is_____.
- A. Defined on the basis of melting point of ice and evaporation temperature of water vapor
- B. Defined on the basis of melting point of ice and condensation temperature of water vapor
- C. Having an interval of 100° between ice point to steam point
- D. Both B and C
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The term analogous to the electrical current in a thermal system is the_____.
- A. Temperature difference
- B. Heat flow rate
- C. Heat content in the system
- D. None of these
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Mercury thermometer is commonly used for low temperature measruement. 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
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Bode diagram is a plot of_____.
- A. Log (AR) vs. log (f) and (Φ) vs. log (f)
- B. Log (AR) vs. f and log Φ vs.f
- C. AR vs. log (f) and Φ vs. log (f)
- D. None of these