Process Control and Instrumentation

291. Which of the following is not the triple point of water?

1. 32°R
2. 273°K
3. 492°R
4. 32°F

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292. Which of the following is the dynamic characteristics of an instrument?

1. Reproducibility
2. Sensitivity
3. Dead zone
4. Fidelity

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293. Which of the following judges the accuracy of an instrument?

1. Dead zone
2. Drift
3. Static error
4. None of these

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294. Which of the following measurements can be made by the measurement of emf?

1. pH value
2. Degree of hydrolysis
3. Composition of complex ions
4. All (A), (B) & (C)

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295. Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit?

1. Seebeck effect
2. Peltier effect
3. Joule heating effect
4. Thomson effect

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296. Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference?

1. Peltier effect
2. Thomson effect
3. Seebeck effect
4. None of these

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297. Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?

1. Mercury thermometer
2. Radiation pyrometer
3. Bimetallic thermometer
4. Thermocouple

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298. Which of the following temperature measuring instruments need not touch the object whose temperature is being measured?

1. Radiation/infrared pyrometer
2. Filled system thermometer
3. Mercury in glass thermometer
4. Thermo electric pyrometer

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299. Which of the following thermocouple materials does not contain nickel?

1. Alumel
2. Chromel
3. Constantan
4. None of these

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300. Which of the following thermocouples can measure the maximum temperature?

1. Platinum-rhodium
2. Tungsten-molybdenum
3. Chromel-alumel
4. Iron-constantan

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