In a horizontal pipeline a 150 mm diameter pipe is connected to a 250 mm diameter pipe. the flow rate in the pipeline is 0.15 m^3/s. take the connection as a sudden enlargement and determine: (a) the pressure head loss vhen the vater flovs from the large pipe to the smaller pipe (take cc=0.64) (b) the pressure head loss when vater flovs from the small pipe to the larger pipe (c) the loss of power in both cases

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Give heat transfer applications for the following, (i) gas turbines (propulsion) ) gas turbines (power generation). (iii) steam turbines. (iv) combined heat and power (chp). (v) automotive engines