Chemical Engineering - Chemical Engineering Basics

31. 

In extrusion of metals, which of the following statement is true ?

A. speed of the extruded material is same as that of ram speed.
B. Redundant work is a function of the die angle.
C. Relative motion between the billet surface and the container wall is always present.
D. Hollow ram is used for indirect extrusion.

Answer: Option D

Explanation:

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32. 

Nuclear fission of one atom of uranium-235 produces the energy equivalent to about __________ MeV.

A. 20
B. 200
C. 500
D. 1000

Answer: Option B

Explanation:

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33. 

Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans ?

A. Emissivity of pipe surface.
B. Diameter & length of the pipe.
C. Temperature of hot pipe surface & that of air in the room.
D. none of these.

Answer: Option D

Explanation:

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34. 

Machinability of hard alloys and tool steels is improved by

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

Answer: Option B

Explanation:

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35. 

Transformation range for ferrous material is the temperature interval during which __________ is formed during its heating.

A. cementite
B. austenite
C. martensite
D. pearlite

Answer: Option B

Explanation:

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