Chemical Engineering - Chemical Engineering Basics

31. 

A material is capable of resisting softening at high temperature, because of its property termed as

A. hot temper
B. hot hardness
C. fatigue
D. creep

Answer: Option B

Explanation:

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32. 

Cascade control is

A. the continuous adjustment of the set point index of an automatic control loop by a primary (master) controller.
B. used when changes in process conditions cause serious upsets in the controlled variable.
C. useful to control flow from temperature.
D. all 'a', 'b' & 'c'.

Answer: Option D

Explanation:

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33. 

Softening of hardned steel is done by its

A. normalising
B. tempering
C. annealing
D. carburising

Answer: Option A

Explanation:

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34. 

Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about

A. 9:1
B. 17 : 1
C. 23 : 1
D. 29 : 1

Answer: Option B

Explanation:

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35. 

Which of the following alloying elements is present in maximum percentage in high speed steel.

A. Molybdenum
B. Chromium
C. Tungsten
D. Vanadium

Answer: Option A

Explanation:

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