E-PolyLearning

6. Internal energy of a gas obeying Vanderwall's equation of state given below, depends upon its
a. pressure & temperature.
b. pressure & specific volume.
c. temperature & specific volume.
d. temperature only.
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Answer: (a).pressure & temperature.

7. Which of the following represents the correct time-temperature curve when a block of metal is heated above room temperature & then left to cool in the room following Newton's law of cooling in which the rate of temperature drop will go on decreasing with the passage of time.
a. A
b. B
c. C
d. D
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Answer: (c).C

8. 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.
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Answer: (d).Hollow ram is used for indirect extrusion.

9. Nuclear fission of one atom of uranium-235 produces the energy equivalent to about __________ MeV.
a. 20
b. 200
c. 500
d. 1000
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Answer: (b).200

10. 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.
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Answer: (d).none of these.

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