Instruction: Answer in questions Data: gas constant of air is 0.287kJ.kg^-1.K^-1 1. The first law of thermodynamics deals with __ A) conservation of heat B) conservation of momentum C) conservation of mass D) conservation of energy 2. A device that violates the conservation law of energy is called a:A) Perpetual Motion Machine of the second kind D) None of these B) Perpetual Motion Machine of the first kind C) Perpetual Motion Machine of the third kind 3. Which of the following is true? A) in a steady flow system,no work is done on the atmosphere B) in case of unsteady flow system, the volume of the system changes C) both of the mentioned D) none of the mentioned 4. The general formulation of the first law of the thermodynamics is written as follows: A) (H_(2)-H_(1))+(1)/(2)m(C_(2)^2-C_(1)^2)+mg(z_(2)-z_(1))=q-w B) (u_(2)-u_(1))+(1)/(2)(C_(2)^2-C_(1)^2)+g(x_(2)-x_(1))=(q)/(m)-(w)/(m) C) (U_(2)-U_(1))+(1)/(2)(C_(2)^2-C_(1)^2)+g(z_(2)-z_(1))=(q)/(m)-(w)/(m) D) (h_(2)-h_(1))+(1)/(2)m(C_(2)^2-C_(1)^2)+gm(z_(2)-z_(1))=q-W 5. The non-flow energy equation (NFEE) is written as follows: A) (U_(2))/(m)-(U_(1))/(m)+(W_(pv))/(m)+(W_(other))/(m)=(Q)/(m) B) h_(2)-h_(1)=q+w_(pv)+w_(other) C) u_(2)+u_(1)=(Q)/(m)-(W_(pe))/(m)+(W_(ether))/(m) D) H_(2)-H_(1)=(Q)/(m)-(W_(m))/(m)-(W_(other))/(m) 6. The steady flow energy equation (SFEE) is written as follows: A) Q_(Cv)-W_(Cv)=(H_(2)-H_(1))+(1)/(2)m(C_(2)^2-C_(1)^2)+mg(z_(2)-z_(1)) D) (Q_(CV))/(m)-(W_(CV))/(m)=(h_(2)-h_(1))+((c_(2)^2-c_(1)^2))/(2)+g(z_(2)-z_(1)) B) (Qcy)/(m)-(W_(CY))/(m)=(h_(2)-h_(1))-((c_(2)^2-c_(1)^2))/(2)-g(z_(2)-z_(1)) (h_(2)-h_(1))+((C_(2)^2-C_(1)^2))/(2)+g(z_(2)-z_(1))=(phi )/(m)+(w)/(m) 7. A mixture of gas expands from 0.03m^3 to 0.06m^3 at a constant pressure of I MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is: A) 30 kJ B) 54 kJ C) 84 kJ D) 114 kJ 8. When the expansion or compression takes place according to the law pv^a=C the process is known as: D) polytropic process A) isothermal process B) adiabatic process C) hyperbolic process 9. The net power output and the thermal efficiency of an heat engine that absorbs heat from a furnace at a rate of 80 MW and rejects heat to the nearest river at a rate of 50 MW are; B) A) (30MW;37.5% ) (40MW;27.5% ) C) (60MW;47.5% ) D) Data are not enough 10. The cycle of a cyclic machine receiving 325 kJ of heat from a 1000 K energy reservoir,rejecting 125 kJ of heat to a 400 Kenergy reservoir and produces 200kJ of work as output is: A) reversible B) irreversible C) impossible D) none of the mentioned 11. Which of the following is correct? A)For an isolated system, dSgeqslant 0 C) For an irreversible process, dSgt 0 D) All of the mentioned B) For a reversible process, dS=0 12. The entropy of an isolated system continuously __ and becomes a __ at the state of equilibrium. A) decreases, minimum B) increases, maximum C) increases, minimum D) decreases, maximum 13. Which of the following sentence is correct: A) Heat reservoir which absorbs heat is called source B) Heat reservoir which rejects heat is called sink C) Heat reservoir is the system having very low heat capacity D) Heat reservoirs can also be called thermal energy reservoirs 14. Which of the following sentence is incorrect: A) First law does not explain the direction of flow of processes. B) First law does not say if a process can actually occur or not C) First law differentiates between work and heat. D) First law of thermodynamics cannot explain or predict the performance of engineering systems 15. The specific heat of a Camot engine is 25% The efficiency is increase to 30% when the sink temperature is reduced by 20^circ C What will be the source temperature. A)300 K B) 400 K C) 500 K D) 600 K 1/2