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tuLihiot engines A and B are operated in succession. The first one, A roceives heat rejects to sink at T,K The second engine 石-300K. If the work outputs of two engines are equal, then the value of T, is (a) 100K from a source at T, -800K and e B receives lheat rejected by the first engine and rejects to another sink at (b) 300x (c) 550K (d) 70oK 22. When an ideal monatomic gas is heated at constant pressure, fraction of heat energy supp cnergy of gas, is 23. A revcrsible cngine converts onc-sixth of the heat input intc work. When the temperature of the sink is reduced by 62°C, the 24. An engineer claims to have made an engine delivering 10 KV power with fuel consumption of 1 g sec. The calorific value of 25 Two cylinders A and B fitted with pistons contain equal amounts of an ideal diatomic gas at 300 K. The piston of A is free to efficiency of the engine is doubled. The temperatures of the source and sink are (a) 80°C 37°C (b) 95°C, 28°C (c) 90°C, 37°C (d) 99°C, 37°C the fuel is 2 kcalg. Is the claim of the engincer (a) Valid (b) Invalid (c)Depends on engi ne design d) Depends of the load move while that of B is held fixed. The same amount of heat is given to the gas in cach cylinder. If the rise in tempcraturc of the gas in A is 30 K, then the rise in temperature of the gas in B is (a) 30 K The volume of air increases by 5% in its adiabatic expansion The pcrcentage decrease in its pressure will be (a) 5% 50 K (c) (c) ANSWERS (b) 18 K (d) 42 K 26. (b) 6% 7% (d) 8% 7. 10. 12. 13. 4. 2 20. | 21. I 22. I 23. 24. İ 25. | 26. |

(b) Q-0,W 0 and AE-W (d) w 0,Q c0 and ME (c) W = 0,Q > 0, and AEInt-Q process, pressure of a fixed mass of a gas is changed in such a manner that the gas molecules gives out at and 103 of work is done on the gas. If the initial intcmal energy of the gas was 40 J, then the final intenal 4. A vessel containing 5 litres of a gas at 0 8 m pressure is connected to an evacuated vessel of volume 3 litres. The 5540 calories of heat convert 1 cubic centimeter of water at 100°C into 1671 cubic centimeter of steam at 100 C at a 6. The volume of an ideal gas is 1 litre and its pressure is equal to 72cm of mercury column. The volume of gas is made 900 energy will be (a) 30J (b) 20J 60.J 40 J resultant pressure inside will be (assuming whole system to be isolated) (a) 4/3 m (b) 0.5 m (c) 2.0 m (d) 3/4 m pressure of one atmosphere. Then the work done against the atmospheric pressure is nearly (a) 540 cal (b) 40 cal (c) Zero cal (d) 500 cal cm by compressing it isothermally. The stress of the gas wll be (a) 8 cm (mercury) The pressure in the tyre of a car is four times the atmospheric pressure at, 300 K. If this tyre suddenly bursts, its new temperature will be b) 7 cm (mercury) 6 cm (mercurv) (d) 4 cm (mercurv) 7· 1.4) (c) 300(2)) 300(4) 1a14 2 The pressure and density of a diatomic gas -7/5) change adiabotically from P,d) to (a) 300(4)4/n4 (b) 300 -32, theshould


(a) 627C (b) 527 C (d) 427°C 327°C 11. During an adiabatic process, the pressure of a gas is found to be proportional ratio Cp /C, for the gas is to the cube of its absolute temperature. The 2 (c) 2 5 12. A gas is compressed at a constant pressure of 50N /m2 from a volume of 10m2 to a volume of 4m2. Energy of l00 then added to the gas by heating. Its intemal energy is (a) Increased by 400J (b) Incrcased by 200J (c) Increased by 100J (d) Decrcased by 200 J A Container having i mole of a gas at a temperature 27°C has a movable piston which mannans at constant pressure in container of 1 atm. The gas is compressed until tetaperatire becomes 12 k) 13 7°C. The work done is (C, for gas is 7,03 callmol (a) 703J (b) 814.J (c) 121 (d) 2035J



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