Chemical Engineering - Process Control and Instrumentation

41.
Temperature of molten pig iron (1450°C) and molten slag (1500°C) flowing out of a blast furnace is measured by a/an
chromel-alumel thermocouple
optical pyrometer
radiation pyrometer
either (b) or (c)
Answer: Option
Explanation:
No answer description is available. Let's discuss.

42.
For two non-interacting first order systems connected in series, the overall transfer function is the __________ of the individual transfer functions.
product
ratio
sum
difference
Answer: Option
Explanation:
No answer description is available. Let's discuss.

43.
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.
250
350
550
700
Answer: Option
Explanation:
No answer description is available. Let's discuss.

44.
Mercury thermometer is commonly used for low temperature measruement. The freezing point and boiling point of mercury are respectively __________ °C.
- 39 and 350
- 51 and 439
- 79 and 395
- 10 and 425
Answer: Option
Explanation:
No answer description is available. Let's discuss.

45.
Which of the following thermocouples has the least temperature measurement range?
Copper-constantan
Chromel-alumel
Platinum-platinum/rhodium
Iron-constantan
Answer: Option
Explanation:
No answer description is available. Let's discuss.