918 ENGINEERING THERMODYNAMICS
dharm
\M-therm\Comp1.pm5
- The expression 0.622
1
p
ppv
− v
is used to determine(a) relative humidity (b) specific humidity
(c) degree of saturation (d) partial pressure.- The effective temperature is a measure of the combined effects of
(a) dry bulb temperature and relative humidity
(b) dry bulb temperature and air motion
(c) wet bulb temperature and air motion
(d) dry bulb temperature, relative humidity and air motion - In air-conditioning design for summer months, the condition inside a factory where heavy
work is performed as compared to a factory in which light work is performed should have
(a) lower dry bulb temperature and lower relative humidity
(b) lower dry bulb temperature and higher relative humidity
(c) lower dry bulb temperature and same relative humidity
(d) same dry bulb temperature and same relative humidity.
ANSWERS - (c) 2. (b) 3. (c) 4. (d) 5. (a) 6. (d) 7. (c)
- (a) 9. (b) 10. (a) 11. (a) 12. (c) 13. (a) 14. (c)
- (b) 16. (d) 17. (b) 18. (a) 19. (a) 20. (c) 21. (a)
- (c) 23. (d) 24. (c) 25. (b) 26. (a) 27. (b) 28. (c)
29. (c) 30. (b) 31. (c) 32. (a) 33. (b) 34. (d) 35. (d)
36. (c) 37. (d) 38. (b) 39. (d) 40. (c) 41. (d) 42. (c)
43. (c) 44. (d) 45. (b) 46. (c) 47. (c) 48. (d) 49. (c)
50. (b) 51. (d) 52. (a) 53. (d) 54. (c) 55. (a) 56. (b)
57. (c) 58. (a) 59. (b) 60. (c) 61. (b) 62. (c) 63. (d)
64. (a) 65. (a) 66. (d) 67. (a) 68. (d) 69. (d) 70. (d)
71. (b) 72. (a) 73. (b) 74. (d) 75. (a).
SOLUTIONS—COMMENTS
- Because throttling is not actually an isothermal process. The expansion of gas causes a fall
in temperature and increased kinectic energy increases it to the initial level. - For isothermal process, T 1 = T 2
or p 1 V 1 = p 2 V 2 ⇒ V 1 =
pV
p22
1
Given :p
p1
2= 10 and V 2 = 0.55 m^3∴ V 1 =
055
10.
= 0.055 m^3
For adiabatic expansion, pVγ = constantor p 1 V 1 γ = p 2 V 2 γ^ ⇒ V 2 = p
p(^1) V
2
1
1
1
F 101 0 055
HG
I
KJ
×= ×
γ
().4. = 0.2848 m^3