In the blast furnace, incorporation of water vapour in the blast gives the follo

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Question
In the blast furnace, incorporation of water vapour in the blast gives the following effect.
Options
A. Increases the reducing potential of the gas.
B. Increases the flame temperature.
C. No significant change occurs.
D. Increases the hydrogen content in the metal.

Correct Answer

Increases the reducing potential of the gas.

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5. Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as
Options
A. Gr^0.25, Gr
B. Gr^0.25, Gr^0.33
C. Gr, Gr^0.25
D. Gr^0.33, Gr^0.25

6. Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of
Options
A. Grashoff number.
B. Grashoff number & Reynolds number.
C. Reynolds number.
D. Grashoff number & Prandtl number.

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