Question 1 : A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of materialA is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is __________ °C.
1. 12
2. 14
3. 18
4. 6
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Question 2 : In a shell and tube heat exchanger, square pitch compared to triangular pitch
1. gives a lower shell side pressure drop.
2. none of these.
3. gives a higher shell side pressure drop.
4. can pack more surface area into a shell of given diameter.
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Question 3 : Which of the following has maximum thermal conductivity ?
1. Iron
2. Nitrogen
3. Coal
4. Tar
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Question 4 : In a forward feed multiple effect evaporator, the pressure is
1. lowest in last effect
2. dependent on the number of effects
3. highest in last effect
4. same in all effects
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Question 5 : In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will
1. either increase or decrease; depends on the coolant flow rate
2. remain unchanged
3. increase
4. decrease
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Question 6 : Sensible heat absorbed by 1 lb of water when it is heated from 32 to 212°F may be around __________ BTU.
1. 970
2. data insufficient, can't be predicted
3. 3.97
4. 180
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Question 7 : The maximum heat transfer co-efficient from steam heating will be attained when the steam is
1. supersaturated
2. saturated
3. none of these
4. wet
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Question 8 : Open pan evaporators are preferred to be used, when the solution to be concentrated is
1. salty
2. highly viscous
3. corrosive
4. scaling
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Question 9 : Steam trap is used to
1. remove water resulting from partial condensation of steam
2. condense the steam flowing in the pipeline.
3. none of these.
4. stop the supply of steam.
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Question 10 : The driving potential for the crystal growth during crystallisation is the __________ of the solution.
1. super-saturation
2. viscosity
3. concentration
4. density
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