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Maximum permissible air velocity in pipelines is about __________ metre/second.

A. 5

B. 10

C. 20

D. 40

Correct Answer : B.


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  1. Water hammer is caused in steam carrying pipelines, because of
  2. Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition…
  3. Enzymes belong to the category of
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  5. __________ of test specimens is not involved in any hardness testing method.
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  10. __________ stress cannot be sustained by a fluid in equilibrium.
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  12. Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed…
  13. In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold…
  14. Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at…
  15. Atomic __________ is a whole number for an element.
  16. Potable water means the water used for
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  18. The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation…
  19. Thermodynamic cycle involved in the working of a thermal power plant is the __________ cycle.
  20. Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical…
  21. The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed…
  22. The order of a chemical reaction
  23. In extrusion of metals, which of the following statement is true?
  24. Faraday's law of electrolysis is related to the
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  26. Filler material used in welding should have __________ as compared to the parent metal to be welded.
  27. Dowtherm is a
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