Engineering :: Instrumentation and Process Control
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31. |
Which of the following temperature measuring devices is widely used to measure the temperature in furnaces? |
A. |
Resistance thermometer |
B. |
Radiation pyrometer |
C. |
Iron-constantan thermocouple |
D. |
Bimetallic thermometer |
Answer: Option B
Explanation:
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32. |
Which of the following temperature measuring devices is widely used measure tube side temperature in a shell and tube heat exchanger? |
A. |
Radiation pyrometer |
B. |
Ordinary mercury-in-glass thermometer |
C. |
Thermocouple |
D. |
Constant-volume helium thermometer |
Answer: Option C
Explanation:
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33. |
A constant-volume gas thermometer works on |
A. |
the principle of Archimedes |
B. |
Boyles law |
C. |
Pascals law |
D. |
Charles law |
Answer: Option D
Explanation:
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34. |
Ordinary mercury-in-glass thermometer works on the principle of |
A. |
volumetric expansion of mercury with increase in temperature |
B. |
increase of vapour pressure with increase in temperature |
C. |
increase of electrical resistance with increase in temperature |
D. |
decrease of vapour pressure with increase in temperature |
Answer: Option A
Explanation:
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35. |
The volumetric expansion of a liquid caused by temperature changes is minimum for |
A. |
mercury |
B. |
ethyl alcohol |
C. |
toluene |
D. |
pentane |
Answer: Option A
Explanation:
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36. |
Bimetallic thermometer works on the principle of |
A. |
increase in electrical resistance with increase in temperature |
B. |
linear thermal expansion of metals |
C. |
volumetric expansion of metals |
Answer: Option B
Explanation:
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37. |
Bimetallic thermometers use |
A. |
two similar metal wires |
B. |
two dissimliar metal wires |
C. |
two strips of metals welded together having different coefficients of thermal expansion |
D. |
two strips of metals welded together having same coefficient of thermal expansion |
Answer: Option C
Explanation:
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38. |
Thermal coefficient of linear expansion has the units of |
Answer: Option A
Explanation:
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39. |
Which of the following metals/alloys has the maximum thermal coefficient of linear expansion? |
A. |
Chromel |
B. |
Brass (70-30) |
C. |
Nickel |
D. |
Invar |
Answer: Option B
Explanation:
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40. |
When a strip made of iron and copper is heated |
A. |
it does not bend |
B. |
it gets twisted |
C. |
it bends with iron on concave side |
D. |
it bends with iron on convex side |
Answer: Option C
Explanation:
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