Choose True or False by ticking (%u221A) the right answer. Each question carries

Question

Choose True or False by ticking (%u221A) the right answer. Each question carries one mark.

1. 1-The change of entropy, when heat is removed from the gas, is positive              T( ), F ( )

2. 2-The entropy of steam will increase, as it flows through an actual adiabatic turbine. T( ), F ( )

3. 3- The single-stage compression process of an ideal Brayton cycle without regeneration is replaced by a multistage compression process with intercooling between the same pressure limits. As a result of this modification, the compressor work decreases.             T( ), F ( )

4. 4- The compression ratio for reciprocating engines is the ratio of the maximum to minimum pressures in the cylinder.                                                                                        T( ), F ( )

5. 5- In open feedwater heaters, the two fluids actually mix, but in closed feedwater heaters there is no mixing.                                                                                                       T( ), F ( )

6. 6- In combined gas-steam cycles, the energy source for the steam is the waste energy of the exhausted combustion gases.                                                                                     T( ), F ( )

7. 7-The coefficient of performance (C.O.P) is the reciprocal of the efficiency.       T( ), F ( )

8. 8- The condition of refrigerant after leaving the compressor and before entering the condenser is superheated vapor.                                                                    T( ), F ( )

9. 9-Liquid fuels have higher calorific value than solid fuels.                                     T( ), F ( )

10. 10-The amount of heat given out by the complete combustion of 1 kg of fuel is known as calorific value of solid or liquid fuel.                                                                    T( ), F ( )

11. 11-A point, in a compressible flow where the velocity is of fluid zero is called critical point   T( ), F ( )

12. 12-The ratio of velocity of fluid in undisturbed stream to the velocity of sound wave is known as Mach number                                                                                T( ), F ( )

Explanation / Answer

1. F as entropy increases with temperature.

2. F , no heat exchange takes place , hence entropy is constant

3. T

4 . F

5. F

6 . T

7.F

8.F

9. T

10.T

11.T

12.F

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.