GATE Previous years Thermodynamics questions GATE 2015 Thermodynamics solved questions set 2 By Rutuja Bothara

RUTUJA BOTHARA Perusing B.Tech in Mechanical Engineering from Vellore Institute of Technology, Vellore. (2015-2019) . Cleared JEE Mains 2015 .Cleared VITEEE-2015 with AIR 8718 Cracked HITSEEE-2015 with AIR 91 . Worked as a Career Counsellor in Teachers Academy (2016- 2018) and BOLO app https://unacademy.com/user/rurutujajb96- 9511

Which of the following statements regarding a Rankine cycle with reheating are TRUE? (i) increase in average temperature of heat addition (ii) reduction in thermal efficiency (iii) drier steam at the turbine exit A. only (i) and (i) are correct B. only (ii) and (ii) are correct C. only (i) and (ii) are correct D. (i), (ii) and (ii) are correct

In basic Rankine cycle, after the isentropic development in turbine, steam is specifically fed into condenser for condensation process. There are two turbines in the reheat system which is utilized for enhancing effectiveness. Steam, after extension from high pressure turbine, is sent again to boiler and heated till it comes to superheated condition. It is then left to extend in low pressure turbine to accomplish condenser pressure. Because of rabasi efficiency al High-pressure turbine High-P Turbine Low-P Turbine Low-pressure turbine Boiler 4 P.-Ps. Preheat Condenser Pump Fig. 7: The ideal reheat Rankine cycle.

The van der Wails equation of state is (p +a/v2) (v-b) RT, where p is pressure, v is specific volume, T is temperature and R is characteristic gas constant The SI unit of a is A. J/kg-K B. m3/kg C. m5/kg-s 2 D. Pa/kg

a/v* is added to P. So both wi have same nits

Work is done on an adiabatic system due to which its velocity changes from 10 m/s to 20 m/ s. elevation increases by 20 m and temperature increases by 1 K. The mass of the system is 10 kg. Cv 100 J/(kg K) and gravitational acceleration is 10 m/s2 . If there is no change in any other component of the energy of the system, the magnitude of total work done (in k]) on the system is A. 4.5 kJ B. 5.6 k C. 6.5 kj D. 7.4 k)

usin SFE Eqution lo20 2. |w/ 4.5K =

1-117.4One kg of air (R 287 j/kg-K) undergoes an irreversible process between equilibrium state 1 (20 C. 0.9 m3) and equilibrium state 2 (20 C, 0.6 m3). The change in entropy S2 S1 (in j/kg-K) is a) 33 J/kg K b) -234.234 J/kg K c) 116.368 J/kg K d) -323.343 J/kg -K

Change in enttopy Vi kg.k

For the same values of peak pressure, peak temperature and heat rejection For same compression ratio and heat rejection notto > DuabnDiesel

Specific Steam consumption is 36 oo = 3600 - 11 kg!kWh

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Rutuja Bothara

Strengthen GATE /PSU/ESE/SSC JE/RRB JE /campus Placements preparation.
A passionate mechanical engineer -VIT University

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Lal Singh

a year ago

sir is bar HAS M SdM ki kitni post h please bataye sir fast reply

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Pankit Chauhan

a year ago

10 vacancies of which 6 are unreserved.

Lal Singh

a year ago

thank you very much sir