TITLE.PM5

906 ENGINEERING THERMODYNAMICS

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\M-therm\Comp1.pm5

7. Which one of the following temperature entropy diagrams of steam shows the reversible and
   irreversible processes correctly?

T

TT

T

s

ss

s

(a) (b)

(c) (d)

Fig. 5

8. Consider the following statements :
   
   
   1. Availability is generally conserved.
   
   
   2. Availability can either be negative or positive.
   
   
   3. Availability is the maximum theoretical work obtainable.
   
   
   4. Availability can be destroyed in irreversibilities.
      Of these statements
      (a) 3 and 4 are correct (b) 1 and 3 are correct
      (c) 1 and 4 are correct (d) 2 and 4 are correct.
   
   
   
   


9. For a given volume of dry saturated steam, Clapeyron’s equation is given by

(a) V–V

dT

dp

T

g t h–h

s

g f

=× (b) V–V dT

dp

h–h

g f T

s g f

s

=×

(c) V–V dp

dT

h–h

g f s T

g f

s

=× (d) V–V dp

dT

T

g f s h–h

s

g f

=×.

10. The Joule-Thomson coefficient is the

(a)

∂

∂

T

p h

F

HG

I

KJ

of pressure-temperature curve of real gases

(b) ∂

∂

T

s v

F

HG

I

KJ

of temperature entropy curve of real gases