In counter-current flow heat exchangers
A. both the fluids at inlet are in their hottest state
B. both the fluids at inlet are in their coldest state
C. both the fluids at exit are in their hottest state
D. one fluid is coldest and the other is hottest at inlet
Answer A
The most commonly used method for the design of duct size is the
A. velocity reduction method
B. equal friction method
C. static regain method
D. dual or double method
Answer C
In a shell and tube heat exchanger, baffles are provided on the shell side to
A. improve heat transfer
B. provide support for tubes
C. prevent stagnation of shell side fluid
D. all of the above
Answer D
A refrigerant with the highest critical pressure is
A. R-11
B. R-12
C. R-22
D. Ammonia
A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be
A. 1/4
B. 1/3
C. 3
D. 4
