Chemical Engineering - Chemical Engineering Basics

6. 

A boy weighing 110lb climbs up a 50 ft high vertical destination in 100 seconds. Horse power of the boy is __________ hp.

A. 0.1
B. 0.5
C. 0.8
D. 1

Answer: Option A

Explanation:

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7. 

Endurance is a measure of fatigue limit of a metal. Fatigue crack in nitrided machine parts originates

A. at the surface.
B. within the core.
C. just below the surface.
D. anywhere on the surface.

Answer: Option B

Explanation:

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8. 

Carbon percentage in high speed steel tool material is 0.6 to 1.0. The hardness of carbon tool steels is increased, when it is alloyed with

A. vanadium & chromium
B. silicon
C. tungsten
D. manganese

Answer: Option A

Explanation:

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9. 

Draft allowance given to patterns is for

A. compensating the liquid state shrinkage.
B. easy removal of pattern from the mold cavity.
C. providing support for the core placement.
D. compensating the solidification shrinkage.

Answer: Option B

Explanation:

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10. 

Which of the following welding processes employs the highest welding temperature ?

A. Arc welding
B. Gas welding
C. Thermit welding
D. Resistance welding

Answer: Option D

Explanation:

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