Chemical Engineering - Chemical Engineering Basics

6. 

A dummy activity is used in PERT network to describe the

A. precedence relationship.
B. resource idleness.
C. resource restriction.
D. necessary time delay.

Answer: Option A

Explanation:

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7. 

Which of the following is not a characteristic observed in material failure by fatigue fracture ?

A. Plastic deformation of material does not occur.
B. Initiation of crack from below the surface does not occur.
C. Initation of crack occurs on the surface of the machine part.
D. Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface.

Answer: Option B

Explanation:

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8. 

A polymer is termed as an 'elastomer', if its percentage elongation is more than 100%. An elastomer is termed as 'rubber' if its percentage elongation is more than __________ percent.

A. 150
B. 200
C. 300
D. 400

Answer: Option B

Explanation:

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9. 

Current employed in resistance welding ranges from __________ kVA/cm2 .

A. 1.2 to 2.5
B. 4.5 to 6.2
C. 7.5 to 8.5
D. 10.5 to 15.5

Answer: Option B

Explanation:

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10. 

Brittleness induced due to the presence of sulphur in steel can be reduced by adding

A. manganese
B. magnesium
C. vanadium
D. copper

Answer: Option A

Explanation:

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