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Engineering :: Heat Transfer


171.  Steam traps are used to
A. Regulate the flow B. Balance the pressure
C. Remove condensate D. Add moisture
E. Heat steam    

172.  Dropwise condensation occurs on a
A. Glazed surface B. Smooth surface
C. Oily surface D. Coated surface
E. None of the above    

173.  Agitated film evaporator is suitable for concentrating
A. Low temperature liquids B. Liquid metal
C. Viscous liquids D. Corrosive liquids
E. Insulating liquids    

174.  Ditus Boelter equation is applicable in case of fluids flowing in
A. Laminar region B. Turbulent region
C. Transition region D. Any of the above
E. None of the above    

175.  In sugar mills cane juice is evaporated in
A. Horizontal tube evaporators B. Long vertical tube evaporators
C. Short vertical tube evaporators D. Zig-zag tube evaporator
E. Flash evaporator    

176.  Which evaporator is preferred for concentrating the fruit juice?
A. Long vertical tube evaporator B. Short vertical tube evaporator
C. Agitated film evaporator D. Zig-zag film evaporator
E. Falling film evaporator    

177.  The material preferred for the fabrication of fruit juice concentrator is
A. Cast iron B. Mild steel sheet
C. Stainless steel sheet D. Copper
E. Brass    

178.  Baffles are provided in heat exchangers to
A. Remove dirt B. Increase heat transfer rate
C. Provide better mechanical strength D. Reduce heat transfer rate
E. Reduce vibrations    

179.  A 1-2 heat exchanger means
A. Single pass on shell side and double pass on tube side B. Single pass on tube side and double pass on shell side
C. Single liquid cools two liwuids at different temperatures D. Two tubes of cold fluid pass through one tube of hot fluid
E. Two tubes of hot fluid pass through one tube of cold tube    

180.  A correction of LMTD is necessary in case of
A. Parallel flow heat exchanger B. Counter current heat exchanger
C. Cross flow heat exchanger D. All of the above
E. None of the above    




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