University of Delhi 2010-2nd Year M.Tech Information Technology 1st nd applied thermodynamics UNIVERSITY - Question Paper
This question paper contains 3 printed pages
701S Your Roil ho
IV!.Tech. / II Sem. j
NUCLEAR SCIENCE AND TECHNOLOGY Paper NST-606 Applied Thermodynamics Time . 3 hours Maximum Marks 70
(Write your Roll No on the lop immediately <m receipt of this question paper)
Attempt all the questions.
Answer briefly and according to the marks allotted for each question.
Use steam table where it is necessary.
1 (a) Show that the internal energy ol the following systems is a function ot Temperature only'
(I) an ideal gas
(II) an incompressible substance .substance is a function ot temperature only
(b )\Vhv would vvl use an mteicooler between compressor stages
(e ) What is i cheat cycle'* Mention two benefits of a reheat cycle (d ) Two kg water at 200 kPa with a qua 11 tv ol 25% has its temperature raised to 250C in a constant pressure process What is the change in
i enthalpy9
(e ) Discuss Molher diagram and its significances in thermodynamic process
(4+4+4-H+4) Marks
2. a) Calculate volume enthalpy, internal energy and entropy of 5 kg ol steam at 0 8 MPa piessure under following conditions 1
(I) Dry and saturated
(II) Wet stream having wetness ol 37 %
(III) Superheated steam at 25QC (2+2+2) Marks (b ) The pressure at the end of compression of a steam engine having a compressor ratio 5 is 0 6 MPa If the piessure and temperature at 0 15 of stroke wcie 0 1 MPa and 70UC respectively, llnd the law of
compression and the value of final temperature (6 - Marks)
(a ) Explain the principle of boilers and mention the types of boilers Discuss the locomotive boilers 0+1 f4) Marks
(b ) Derive the Fuler and Bernoulli equation from S|eady I low Lncrgy Equation (S V li 1 ) for steady How system What is the difference between the work for non-flow and flow process1 Show with the help ot PV diagram ?
3. (a ) What is a heat exchanger'' Derive the heat transfer rate for parallel How heal exchanger'* Why are countei How heat exchangers superior to parallel flow/ heat exchanger'*
(b) Use the formulae and steam table to find the relative humidity and specific humidit\ corresponding to 25C drv bulb and 21C wet bulb
temperature (3 ) Marks
4 (a) \ diesel engine has a slate befoie compiession ol 95 kPa. 290 K, and a peak pressure ot 6000 kPa a maximum temperature of 2400 K Find the volumetric compiession ratio and the thermal efficiency
(b) I xplatn the vapour compression cycle with the help of T-s and p h diagrams fxplain the effect of supeiheat and subeooltng on this cvcle Deme the expiession toi ( OP
or
A fluid undeigoes a reversible adiabatic compression according to the law pv" constant Determine the change in enthalpy internal energy and entropy, and the heat tianster and work transfer during this process
(c ) 1 he theinial eMiciency of the e>de (4-+4f4 )
Marks
Pi - P4 - 20 MPa Tj - 700 1 C P: - P> - 20 kPa T; - 40 C
Fig 1
fb ) 1 he pump work input and enthalpy at the pump exit state
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