Chemical Engineering - Chemical Engineering Basics

11. 

For a first order chemical reaction, the concentration of the reactant decreases __________ with time.

A. linearly
B. exponentially
C. logarithmically
D. inversely

Answer: Option A

Explanation:

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12. 

Air standard Otto cycle is more efficient than the diesel cycle for the same

A. heat addition & compression ratio.
B. heat addition & pressure.
C. compression ratio & pressure.
D. cylinder dimension & rpm.

Answer: Option A

Explanation:

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13. 

In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________ increases.

A. percentage elongation
B. brinell hardness
C. tensile strength
D. all 'a' , 'b' & 'c'

Answer: Option A

Explanation:

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14. 

A suitable lubricant used for watches is

A. metallic soap solution
B. grease
C. palm oil
D. hazel-nut oil

Answer: Option D

Explanation:

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15. 

Out of the following __________ iron has the best capability to bear sudden & excessive shocks.

A. white
B. cast
C. wrought
D. pig

Answer: Option C

Explanation:

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