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# Thermodynamics : Nuclear Quiz 1

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Question 1

Calculate Efficiency of the system, the net Work transfer & Heat rejected to sink for a Carnot cycle operates between sources and sink temperatures of 285 °C and – 11 °C. If the system receives 100 kJ from the source.

Question 2

5 m

^{3}of an ideal gas at 1 bar pressure is compressed isothermally in an adiabatic piston-cylinder device to 2 m^{3}. Maximum work input needed by the compressor isQuestion 3

The COP of a Carnot refrigerator is 6. The ratio of its lower and higher absolute temperature is :

Question 4

The vander Walls equation of state is (p+a/V

^{2}) (v-b) = RT, where p is pressure, v is specific volume, T is temperature and R is characteristic gas constant The SI unit of a isQuestion 5

What will be change in entropy of the system if a piston-cylinder arrangement contains 0.06 m

^{3}of Nitrogen at 1bar and 295K is compressed isothermally until the pressure of the gas becomes 6 bar.Question 6

A certain amount of an ideal gas is initially at a pressure

*P*_{1}and temperature*T*_{1}. First, it undergoes a constant pressure process 1-2 such that*T*_{2}= 3*T*_{1}/4. Then, it undergoes a constant volume process 2-3 such that*T*_{3}=*T*_{2}/2. The ratio of the final volume to the initial volume of the ideal gas isQuestion 7

Two boilers one with superheater (h

_{1}= 3200 KJ/Kg) and other without superheater (h_{2}= 2800 KJ/Kg) are delivering equal quantities of steam into common main. What will be the enthalpy of common main?Question 8

A rigid container of volume 0.6 m

^{3}contains 1.0 Kg of water at 120⁰C (V_{f}= 0.00106 m^{3}/Kg, V_{g}= 0.8908 m^{3}/Kg). the states of water isQuestion 9

A reversible engine operates between temperatures 900 K and and another reversible engine between and 400 K in series. What is the value of if efficiency of both the engines are equal?

Question 10

A 2kW electric resistance heater submerged in 5 kg water is turned on and kept on for 10 min. During the process 300 kJ of heat is lost from the water the temperature rise of water is.

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