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Thermodynamics: Introduction
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Thermodynamics: Introduction
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25 Questions

1. The temperature interval from the oxygen point to the gold point is divided into how many parts?
2. An escalator raises a 100 kg bucket of water 10 m in 60 seconds. Determine the amount of work done during the process.
3. In the equation dV=(1/p)dW, (1/p) is known as
4. Which of the following were used as fixed points before 1954?
5. Work done by a system is taken to be
6. What is the standard fixed point of thermometry?
7. A radiant heating lamp has a temperature of 1000 K with ε = 0.8. What should be the surface area to provide 250 W of radiation heat transfer?
8. A hydraulic cylinder has a piston(cross sectional area 25cm2) and a fluid pressure of 2 MPa. If piston moves by 0.25m, how much work is done?
9. A pressure of 650 kPa pushes a piston of radius 0.125 m with V = 5 m/s. What is the transmitted power?
10. A torque of 650 Nm rotates a shaft of radius 0.125 m with ω = 50 rad/s. What is the transmitted power?
11. Air at a constant pressure in a piston-cylinder is at 300 K, 300 kPa and V=0.1 m^3. It is heated to 600 K in 30 seconds in a process with constant piston velocity. Find the power delivered to the piston.
12. Optical method is adopted for measuring temperatures higher than the gold point?
13. A current of 10 amp runs through a resistor with resistance of 15 ohms. Find the rate of work that heats the resistor up.
14. Work done on a system is taken to be
15. The magnitude of mechanical work is the
16. In a thermally insulated kitchen, a refrigerator with 2 kW motor for running the compressor provides 6000 kJ of cooling to the refrigerated space during 30 min operation. If the condenser coil placed behind the refrigerator rejects 8000 kJ of heat to the kitchen during the same period, calculate the change in internal energy of the kitchen.
17. A piston of mass 2 kg is lowered by 0.5 m. Find the work involved in the process.
18. Thermodynamic properties are
19. When a body A is in thermal equilibrium with a body B, and also separately with a body C, then B and C will be in thermal equilibrium with each other.
20. Cyclic integral of a property is always
21. All gases and vapours approach ideal gas behaviour at?
22. A real gas behaves as an ideal gas when?
23. A window having area of 2m^2 has a surface temperature of 15°C and the air is blowing at 2°C across it with convection heat transfer coefficient of h = 125 W/m2K. Find the total heat transfer loss?
24. Work done in a quasi-static process
25. Work is a

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