GATE Previous years Thermodynamics questions GATE 2009 Thermodynamics solved questions By Rutuja Bothara

RUTUJA BOTHARA . Perusing B.Tech in Mechanical Engineering from Vellore Institute of Technology, Vellore. (2015-2019) . Placed in Alstom Transport India Ltd. . Cleared JEE Mains 2015 Cleared VITEEE-2015 with AIR 8718 unacademy 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

2009 If a closed system is undergoing an irreversible process, the entropy of the system (A) must increase (B) always remains constant (C) Must decrease (D) can increase, decrease or remain constant

A frictionless piston-cylinder device contains a gas initially at 0.8MPa and 0.015 m3. It expands quasi-statically at constant temperature to a final volume of 0.030 m. The work output (in kJ) during this process will be (A) 8.32 (B) 12.00 (C) 554.67 (D) 8320.00

Work ouput for isotheema proces VI 800 X 0.015 In o.ogo

A compressor undergoes a reversible, steady flow process. The gas at inlet and outlet of the compressor is designated as state 1 and state 2 respectively. Potential and kinetic energy changes are to be ignored. The following notations are used : n Specific volume and p = pressure of the gas. The specific work required to be suppliad tn tha comnressor for this gas compression pro (A)pd (C) vi (P2 Pi) (D) -p2(v1 2)

Specific rk of compressor is 2 n(n-n) approximation o4 the geal fotmala

Steady flow energy equation and Tds dh vdp Tds dQ (for reversible process) form (i) dQ = h2-hit dwvx 2

In an air-standard Otto-cycle, the compression ratio is 10. The condition at the beginning of the compression process is 100 kPa and 27 Cc. Heat added at constant volume is 1500/kj kg, while 700 kJ kg of heat is rejected during the other constant volume process in the cycle. Specific gas constant for air 0.287/ kJ kgk. The mean effective pressure (in kPa) of the cycle is 103 -310 515 - 1032

P Con 2 uation , Osing ideal ga US

An irreversible heat engine extracts heat from a high temperature source at a rate of 100 kW and rejects heat to a sink at a rate of 50 kW. The entire work output of the heat engine is used to drive a reversible heat pump operating between a set of independent isothermal heat reservoirs at 17 C and 75 C. The rate (in kW) at which the heat pump delivers heat to its high temperature sink is (A) 50 (C) 300 (B) 250 (D) 360

For heat engine ooK oustpus COP + heat Purn-P is Pump S h/ T4-T3 Q4 34 So Q4 .goo Kw

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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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Alina Nihal

8 months ago

very nice method...thank you so much!

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Saurav kumar

10 days ago

I want to know where r u now ?(Credits-Alan wALKER)

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