Chemical Engineering MCQs

Page No. 505

Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always_________________?


aLess than arithmetic mean value

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bMore than arithmetic mean value

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cMore than geometric mean value

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dBoth B. & C.

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The dust collection efficiency of a cyclone separator_________________?


aDecreases with increase in gas flow rate

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bIs inversely proportional to the mass of the dust particle

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cIs directly proportional to the radius of the dust particle path

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dNone of these

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View Answer None of these

Baffle spacing is generally _________________ the I.D. of the shell ?


aMore than

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bNot greater than

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cNot less than one fifth of

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dBoth B. and C.

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View Answer Both B. and C.

In the allocated cap area, bubble caps are generally arranged on equilateral triangular pitch. Number of caps fixed on a plate is with a __________________?


aClearance of 25-75 mm

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bCap pitch of 1.3-2 times the cap diameter

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cEither A. or B.

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dNeither A. nor B.

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View Answer Either A. or B.

In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube) ?


a4(P2 – πd2/4)/πd

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b(P2 – rd2/4)/rd

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c4P2/πd

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dπd/4P2

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View Answer 4(P2 – πd2/4)/πd

For identical operating conditions, the pressure drop over _______________ tray is the highest out of the following?


aSieve

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bValve

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cCounter flow

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dBubble cap

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View Answer Bubble cap

Heat transfer co-efficient for a horizontal condenser as compared to a vertical condenser operating under similar conditions is_______________?


aSame

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bLess

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cAbout 3 times

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dAbout 0.33 times

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View Answer About 3 times

Wind load consideration in the design of a support can be neglected, when the vessel is___________________?


aTall (say 30 metres), but is full of liquid

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bTall but empty

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cShort (< 2 m) and housed indoor

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dNone of these

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Factor of safety (i.e., overdesign factor) in heat transfer equipments is about _____________ percent more than the actual/theoretical design factor?


a5-10

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b15-20

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c30-35

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d35-40

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View Answer 15-20

The ratio of the largest load in a test to the original cross-sectional area of the test specimen is called the _____________ stress?


aYield point

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bBreaking

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cUltimate

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dNone of these

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View Answer Ultimate

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