Process Control and Instrumentation problems
- 1. Dome temperature of blast furnace stove is most accurately measured by a
Options- A. radiation pyrometer.
- B. platinum-platinum/rhodium ther-mocuple.
- C. iron-constantan thermocouple.
- D. platinum resistance thermometer. Discuss
Correct Answer: platinum-platinum/rhodium ther-mocuple.
- 2. Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury.
Options- A. 250
- B. 350
- C. 550
- D. 700 Discuss
Correct Answer: 550
- 3. A manometer measures the __________ pressure.
Options- A. atmospheric
- B. absolute
- C. gauge
- D. none of these Discuss
Correct Answer: gauge
- 4. Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is
Options- A. chromel-alumel
- B. iron-constantan
- C. platinum-platinum+rhodium
- D. none of these. Discuss
Correct Answer: chromel-alumel
- 5. Continuous measurement of specific gravity of a liquid is done by
Options- A. hydrometer
- B. contact-type electric indicators
- C. displacement meter
- D. both (a) and (c) Discuss
Correct Answer: both (a) and (c)
- 6. What is the Laplace transform of sin t?
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 7. Temperature of molten pig iron (1450°C) and molten slag (1500°C) flowing out of a blast furnace is measured by a/an
Options- A. chromel-alumel thermocouple
- B. optical pyrometer
- C. radiation pyrometer
- D. either (b) or (c) Discuss
Correct Answer: either (b) or (c)
- 8. In Bode plot, A.R. vs. w is plotted on a/an __________ graph paper.
Options- A. log-lag
- B. triangular
- C. ordinary
- D. semi-log Discuss
Correct Answer: log-lag
- 9. Stroboscope is used for the measurement of
Options- A. rpm of a flywheel
- B. frequency of light
- C. depression of freezing point
- D. liquid level under pressure Discuss
Correct Answer: rpm of a flywheel
- 10. Minute depression of freezing point of a liquid solvent on addition of a solid solute can be best measured by a
Options- A. Beckman thermometer
- B. dilatometer
- C. mercury thermometer
- D. bimetallic thermometer Discuss
Correct Answer: Beckman thermometer
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