Engineering :: Thermodynamics
|
|
|
|
|
21. |
Isentropic flow is |
A. |
Irreversible adiabatic flow |
B. |
Perfect gas flow |
C. |
Ideal fluid flow |
D. |
Reversible adiabatic flow |
E. |
Frictionaless reversible flow |
|
|
Answer: Option D
Explanation:
|
22. |
Triple point temperature and pressure for water are |
A. |
100?C and 1 ata |
B. |
0?C 1 ata |
C. |
0?C and 0.1 ata |
D. |
0.1?C and 0.006028 ata |
E. |
0.01?C and 0.006028 ata |
|
|
Answer: Option E
Explanation:
|
23. |
Avogadro's numbers is |
A. |
6.02486 x 1026 molecules/(k mol) |
B. |
60.2486 x 1026 molecules/(k mol) |
C. |
602.486 x 1026 molecules/(k mol) |
D. |
6024.86 x 1026 molecules/(k mol) |
E. |
60248.6 x 1026 molecules/(k mol) |
|
|
Answer: Option A
Explanation:
|
24. |
The unit of universal gas constant is |
Answer: Option A
Explanation:
|
25. |
In the regenerative cycle |
A. |
Steam is reheated after expansion and again used |
B. |
Power is generated in two stages |
C. |
Part of the steam is withdrawn from the turbine and is used in heating the steam being supplied to the turbine |
D. |
Part of the steam is withdrawn from the turbine and is used in heating the feed water |
E. |
Part of the steam is withdrawn from the turbine and is utilised in heating the exhaust steam |
|
|
Answer: Option D
Explanation:
|
26. |
If a heat engine gives an output of 3 kW and input is 10,000 J/s the thermal efficiency of the engine will be |
Answer: Option A
Explanation:
|
27. |
A reversible process requires that |
A. |
There be no heat transfer |
B. |
Newton's law of viscosity be satisfied |
C. |
Temperature of system and surroundings be equal |
D. |
There whould be no viscous or coulomb friction in the system |
E. |
Heat transfer occurs from surrounding to system only |
|
|
Answer: Option D
Explanation:
|
28. |
The critical pressure at which latent heat of vaporisation for water is zero is |
A. |
100 kg/cm2 |
B. |
215.1 kg/cm2 |
C. |
228.6 kg/cm2 |
D. |
235.6 kg/cm2 |
E. |
250.6 kg/cm2 |
|
|
Answer: Option C
Explanation:
|
29. |
1 kgf/cm2 is equal to |
A. |
1 mm Hg |
B. |
100 mm Hg |
C. |
735.6 mm Hg |
D. |
760 mm Hg |
E. |
776 mm Hg |
|
|
Answer: Option C
Explanation:
|
30. |
The first law of thermodynamics, for steady flow |
A. |
Accounts for all energy entering and leaving a control volume |
B. |
Is an energy balance for the specified mass of fluid |
C. |
Is an expression of the conservation of linear momentum |
D. |
Is primarily concerned with heat transfer |
E. |
Is restricted in its application to perfect gases |
|
|
Answer: Option A
Explanation:
|
Read more:
|
|