Fill in the blank or circle the correct answer as necessary

Fill in the blank or circle the correct answer as necessary (4 points tor each): A machine design which violates the 2^nd Law of Thermodynamics is called a A reversible Carnot cycle engine is more efficient than a reversible Otto engine because it exchanges heat with zero delta T. (True or False) The 2^nd law statement that requires a heat engine to reject heat to a low temperature reservoir is called the. The temperature of Helium passing through a throttling valve would be expected to (increase, remain the same, decrease). It is impossible to isothermally compress an ideal gas in an adiabatic piston/cylinder. (True or False) One half kilogram of steam is compressed from 200 kPa and 400 degree C to 200 degree C in an isobaric process. Calculate the boundary work and heat transfer during this process, (ans: -46.4 kJ and -203 kJ) Helium (k = 5/3) is initially in a piston cylinder with a spring (as shown) at 200kPa and 0.05 m^3 before being heated to 300kPa and 0.10 m^3. Calculate the amount of heat added assuming only reversible boundary work, (ans: 48.8 kJ)

Solution

1st answer- perpetual motion machine of type 2

2nd answer-true

3rd answer-sink

5th answer - false