Sudarshan bails a certain quantity of "First Grade" petrol, to be stored safely till the end of March 2011. Raghman, without the consent of Sudarshan mixes the first grade petrol with his own "Second Grade" petrol on 1st April, 2011, when Sudarshan asked Raghman for his first grade petrol Raghman tells him to take the bailed quantity of petrol out of the mixed petrol. Sudarshan refused to take the mixed petrol and instead claims the prices of the "First Grade" petrol, which is higher than "Second Grade". Raghman refuses to compensate Sudarshan for the above on the ground of impossibility of performance.

Acompressor receives the shaft work to decrease the pressure of the fluid. 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?

Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.