A rigid tank of volume V is subdivided into two parts with volumes V1 = V/3 and V2 = 2V/3 using a rigid partition. Volume V1 contains an ideal gas at 800◦C and pressure P1 while volume V2 is completely evacuated. Now the partition between the two volumes is removed, upon which the ideal gas expands into the entire tank. Heat is then applied to the gas until its pressure becomes equal to its initial pressure P1.

Determine the final temperature of the gas.

An electrical motor raises a 50kg load at a construct velencity .calculate the power of the motor, if it takes 40sec to raise the load through a height of 24m(take g =9.8n/g)

Fluids at rest possess no flow energy. a)- true b)- false

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.