TITLE.PM5

COMPETITIVE EXAMINATIONS QUESTIONS 909

dharm
\M-therm\Comp1.pm5

pp

V V

2 2

3

3

1 1

(c) (d)

Fig. 9

19. In a Rankine cycle, with the maximum steam temperature being fixed from metallurgical
    considerations, as the boiler pressure increases
    (a) the condenser load will increase
    (b) the quality of turbine exhaust will decrease
    (c) the quality of turbine exhaust will increase
    (d) the quality of turbine exhaust will remain unchanged.


20. Match List I (details of the processes of the cycle) with List II (name of the cycle) and select
    the correct answer using the code given below the Lists :
    List I List II
    A. Two isothermals and two adiabatics 1. Otto
    B. Two isothermals and two constant volumes 2. Joule
    C. Two adiabatics and two constant pressures 3. Carnot
    D. Two adiabatics and two constant pressures 4. Stirling
    Codes :
    (a) ABCD (b) ABCD
    4312 4321
    (c) ABCD (d) ABCD
    3412 3421.


21. Two blocks which are at different states are brought into contact with each other and
    allowed to reach a final state of thermal equilibrium. The final temperature attained is
    specified by the
    (a) Zeroth law of thermodynamics (b) First law of thermodynamics
    (c) Second law of thermodynamics (d) Third law of thermodynamics.


22. A control mass undergoes a process from state 1
    to state 2 as shown in Fig. 10. During this proc-
    ess, the heat transfer to the system is 200 kJ. If
    the control mass returned adiabatically from state
    2 to state 1 by another process, then the work
    interaction during the return process (in kN.m)
    would be
    (a) – 400 (b) – 200
    (c) 200 (d) 400.

123

100

200

300

V m^3

1

2

p

kN/m^2

Fig. 10