Chemical Engineering - Chemical Engineering Basics

31. 

Heat treatment of steel is done to mainly change its __________ properties.

A. physical
B. chemical
C. mechanical
D. surface

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

32. 

Normal dosage of chlorine in public water supply scheme ranges from __________ ppm.

A. 0.5 to 1
B. 10 to 15
C. 300 to 500
D. 1000 to 1500

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

33. 

Cast iron has the unique property of high

A. ductility
B. damping characteristics
C. hardness
D. malleability

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

34. 

Thermal shock produced by cooling is more dengerous/deleterious than that produced by heating a surface, because of the reason that

A. cooling produces tension on the surface.
B. cooling produces compression on the surface.
C. heating does not produces any thermal stress.
D. heating produces compression on the surface.

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

35. 

The hardness of a grinding wheel is specified by the

A. alphabetical letter.
B. Rockwell hardness number.
C. Brinell hardness number.
D. none of these.

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.