TITLE.PM5

COMPETITIVE EXAMINATIONS QUESTIONS 907

dharm
\M-therm\Comp1.pm5

(c) ∂

∂

h

s T

F

HG

I

KJ

of enthalpy entropy curve of real gases

(d) ∂

∂

v

T p

F

HG

I

KJ

of pressure volume curve of real gases.

11. Which one of the following p-T diagrams illustrates the Otto cycle of an ideal gas?
    pp

TT

(a) (b)

pp

TT

(c) (d)

Fig. 6

12. When a system is taken from state A to state B along
    the path A-C-B, 180 kJ of heat flows into the system
    and it does 130 kJ of work (see Fig. 7 given).
    How much heat will flow into the system along
    the path A-D-B if the work done by it along the path
    is 40 kJ?
    (a) 40 kJ (b) 60 kJ
    (c) 90 kJ (d) 135 kJ.


13. A gas expands from pressure p 1 to pressure p 2 p 2 p^1
    10

F =

HG

I

KJ

. If the process of expansion is

isothermal, the volume at the end of expansion is 0.55 m^3. If the process of expansion is

adiabatic, the volume at the end of expansion will be closer to

(a) 0.45 m^3 (b) 0.55 m^3

(c) 0.65 m^3 (d) 0.75 m^3.

A

C B

D

p

Fig. 7 V