E-PolyLearning

16. The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.
a. 60 - 100
b. 400 - 700
c. 1200 -1500
d. 2000 - 2300
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Answer: (b).400 - 700

17. Maximum permissible air velocity in pipelines is about __________ metre/second.
a. 5
b. 10
c. 20
d. 40
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Answer: (b).10

18. Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of
a. Grashoff number.
b. Grashoff number & Reynolds number.
c. Reynolds number.
d. Grashoff number & Prandtl number.
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Answer: (d).Grashoff number & Prandtl number.

19. The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be
a. parabolic
b. hyperbolic
c. straight line
d. none of these
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Answer: (a).parabolic

20. Energy of the sun arises mainly from __________ reactions.
a. fusion
b. fission
c. combustion
d. none of these
View Answer Report Discuss 50-50!
Answer: (a).fusion

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