QnA : Thermodynamics

QnA of Thermodynamics :

1. The efficiency of carnot Engine depends on - temperature source and sink .

2. In an isothermal process , the internal energy remains constant .

3. Change in entropy for reversible adiabatic process is zero .

4. Which is extensive property ?  Volume

Extensive property - depends upon size  -mass , 

                                                              -Energy

                                                              Entropy

                                                             -Enthalpy

Intensive Property - do not depend upon size -

        Temperature , Pressure , Density , viscosity 

5. Internal energy is a function of only temperature (absolute ) .

6. According to kinetic theory of gases , the absolute zero temperature is attached when -kinetic energy of molecules of gas is zero .

7. An adiabatic process in a thermo dynamic system is one in which there is ? 

No heat transfer to or from the system through the boundary .

8. Change of energy depends on - transfer of heat .

9. For which substances , the internal energy and enthalpy are the functions of temperature only ?

Perfect has .

10. Increse in pressure raise the boiling point of a liquid .

11. First law of thermodynamics furnishes the relationship between Heat , work and properties of system .

12. Critical pressure for steam is  221 bar .

13. The volumetric efficiency of compressor with in - create in compression Ratio will -Decreases .

14. The function of condenser in thermal power plant is -to act as reservoir to receive steam for turbine .

  - to condense steam into condensor to be erased again .

 - to create vaccume .

15. What salts of calcium and magnesium cause temperature hardness of boiler feed water ?

 Bicarbonates

16. For specifying the state of wet vapour , one needs pressure , temperature and one more intensive property  .

17. Which is a high pressure boiler ? 

Benson boiler 

High pressure boiler - Lamount boiler , Benson boiler , Loeffler boiler , Velox boiler , Stirling boiler .

Low pressure boiler - Locomotive boiler , Cochran boiler , Lancashire boiler , Bab - cock Wilcox boiler 

18. Thermal efficiency of thermal power plant is of the order of 30 °

19. For specifying the state of superheated vapour , one needs pressure as well as temperature .

20. Which boiler is water tube bolier ?

Babcock and Wilson boiler .

21. Economizer in boiler decrease fuel consumption .

22. Centrifugal compressor works on the principal of  conversion of kinetic energy into pressure energy .

23. Volumetric efficiency of air compressor is the ratio of air actually delivered to the amount of piston displacement .

24. A device used to increase the temperature of system without raising it's pressure is called super heater .

25. Fusible plug for a steam boiler is an alloy consisting of bismuth , lead and tin .

26. Efficiency of gas turbine is increased by 

Reheating , Intercooling , adding a regenerator .

27. 1 ton of refrigeration is equivalent to 3.5 kw .