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Chemical Engineering :: Chemical Engineering Basics

  1. Which of the following is not the function of a volute casing provided in a centrifugal pump ?

  2. A.
    To reduce the head loss in discharge.
    B.
    To increase the pump efficiency.
    C.
    To collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at constant velocity.
    D.
    To increase the pump discharge rate.

  3. The pressure outside a bubble/droplet of liquid is __________ the internal pressure.

  4. A.
    greater than
    B.
    less than
    C.
    equal to
    D.
    unpredictable ; depends on the bubble size

  5. Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of

  6. A.
    1:1
    B.
    1:2
    C.
    2:1
    D.
    1:4

  7. Powder metallurgy technique is used in the production of __________ tools.

  8. A.
    tungsten carbide
    B.
    high carbon steel
    C.
    high speed steel
    D.
    drilling

  9. Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are

  10. A.
    cobalt, chromium & tungsten,
    B.
    cobalt, chromium & nickel.
    C.
    molybdenun, tungsten & chromium.
    D.
    cobalt, zirconium & molybdenum.

  11. Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water)?

  12. A.
    Aluminium
    B.
    Copper
    C.
    Titanium
    D.
    Stainless steel

  13. Which of the following is an ore dressing operation ?

  14. A.
    Classification
    B.
    Smelting
    C.
    Roasting
    D.
    None of these

  15. Gratings is associated with the measurement of

  16. A.
    linear displacement.
    B.
    concavity/convexity.
    C.
    surface texture.
    D.
    flatness.

  17. __________ joint is mostly used for joining pipes carrying water at low pressure.

  18. A.
    Nipple
    B.
    Socket
    C.
    Union
    D.
    Bell and spigot