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- Question
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.
- Correct Answer
- Grashoff number & Prandtl number.
- 1. 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. Discuss
- 2. All of the following alloying elements of steel increases hardness but sacrifice ductility, except
Options- A. nickel
- B. vanadium
- C. molybdenum
- D. chromium Discuss
- 3. Auto collimator is used to check
Options- A. flatness
- B. angle
- C. rotor balancing
- D. roughness Discuss
- 4. An alloy of Fe - 0.4 % C is
Options- A. cast iron.
- B. hypo-eutectoid steel.
- C. hyper-eutectoid steel.
- D. eutectoid steel Discuss
- 5. Annealing ofwhite cast iron produces __________ iron.
Options- A. grey
- B. nodular
- C. malleable
- D. spheroidal Discuss
- 6. 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. Discuss
- 7. The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.
Options- A. 60 - 100
- B. 400 - 700
- C. 1200 -1500
- D. 2000 - 2300 Discuss
- 8. Sudden fall of atmospheric pressure by a large amount is an indication of the
Options- A. rain
- B. cold wave
- C. storm
- D. fair weather Discuss
- 9. Energy of the sun arises mainly from __________ reactions.
Options- A. fusion
- B. fission
- C. combustion
- D. none of these Discuss
- 10. Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.
Options- A. grey
- B. black
- C. opaque
- D. white Discuss
Chemical Engineering Basics problems
Search Results
Correct Answer: Increases the reducing potential of the gas.
Correct Answer: nickel
Correct Answer: angle
Correct Answer: hypo-eutectoid steel.
Correct Answer: malleable
Correct Answer: Hollow ram is used for indirect extrusion.
Correct Answer: 400 - 700
Correct Answer: storm
Correct Answer: fusion
Correct Answer: grey
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