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HT UNIT-5 TEST

Authored by Dr. Rahul Mahajan

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HT UNIT-5  TEST
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35 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Air is best heated with steam in a heat exchanger of

plate type.

double pipe type with fin on steam side.

double pipe type with fin on air side.

shell and tube type.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Shell side pressure drop in a shell and tube heat exchanger does not depend upon the

baffle spacing & shell diameter.

tube diameter & pitch.

viscosity, density & mass velocity of shell side fluid.

none of these.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area

increases

decreases

remains constant

passes through a maxima

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Hot water (0.01 m3 /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m3/min) of density 800 kg/m3 and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

23

32

53

35

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a heat exchanger, floating head is provided to

facilitate cleaning of the exchanger.

increase the heat transfer area.

relieve stresses caused by thermal expansion.

increase log mean temperature gradient.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Baffles in the shell side of a shell and tube heat exchanger

increase the cross-section of the shell side liquid.

force the liquid to flow parallel to the bank.

increase the shell side heat transfer co-efficient.

decrease the shell side heat transfer co-efficient.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

finned tube heat exchanger with air inside and steam outside.

finned tube heat exchanger with air outside and steam inside.

shell and tube heat exchanger with air inside tubes and steam on shell side.

shell and tube heat exchanger with air on shell side and steam inside tubes.

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