Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 4th Semester (Fourth Semester) 2015-16 401EME Applied Thermodynamics Question Paper
(Following Paper ID and Roll No. to be ?lled in your
Answer Books)
B.TECH.
Theory Examination (Semester-IV) 2015-16
APPLIED THERMODYNAMICS
Time : 3 Hours Max. Marks : 100
Section-A
Q1. Attempt all parts. All parts carry equal marks. Write
answer of each part in short. (2XI0=20)
(a) De?ne the heat rate using in the Rankine cycle.
(b) De?ne propulsive power and propulsive ef?ciency.
(c) Explain about congeneration.
((1) Explain the signi?cance of Willian?s law in steam
engines.
(e) How Equivalent evaporation is used for comparison
of boilers?
(1) P.T.O.
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(f)
u?
(h)
(i)
(i)
What do you mean by a perfect cooling?
Why Rankine cycle is modi?ed?
What is clausius clapeyron equation?
De?ne adiabatic ?ame temperatuxe.
What do you mean by Thrust Augmentation?
Section-B
Q2. Attempt any ?ve question. Each question carries equal
marks.
(a)
(b)
(5x10=50)
What do you understand by inversion curve? De?ne
Joules coefficient. How these can be used for re?'ig-
eration?
A sample fuel has the following percentage compo-
sition by weight, Carbon = 84% hydrogen = 10%.
oxygen = 3.5% nitrogen = 1.5% and Ash = 1%.
(i) Determine the stoichiometn'c air fuel ratio by
mass.
(ii) If 20% excess air is supplied, ?nd percentage
composition of dry fuel gas by volume.
(2)
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(c)
(d)
(e)
What is the ?mction of condenser? Classify and
Explain Barometric jet condenser with neat sketch?
A steam power plant operates on the regenerative
cycle. Stmm fonn boiler at 30 bar and 400?C is
expanded in a turbine. A part of the steam is bled at
2 bar pressure in to the feed water heater and the
remainder is condensed at 0.07 bar. Neglecting pump
work, determine the work done per kg of steam and
the efficiency of the cycle.
A double acting single cylinder steam engine runs at
250 rpm and evelops 30 kW. The pressure limits of
operation are 10 bar and 1 bar. Cut off is 40% of the
stroke. The UD ratio is 1.25 and diagram factor is
0.75. Assume dry saturated steam at inlet, hyperbolic
expansion and neglighble effect of piston rod. Find:
(i) Mean effective pressure
(ii) Cylinder dimensions
(ii) Indicated thermal
(1) An impulse steam turbine of 180 kW has steam ?ow-
ing at rate of 165 kg/min and leaving axially. Steam
turbine blade speed is 175 m/s and it leaves nozzle
at 400 m/s. For the blade velocity coef?cient of 0.9.
(3) P.'1?.O.
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Find nozzle angle, blade angles at inlet and exit, axial
thrust and diagram ef?ciency.
(g) De?ne critical pressure ratio for nozzle of the steam
turbine. Obtain analytically its value in terms of the
index of expansion.
(h) With the help of Enthalpy?entropy and schematic
diagrams explain the difference between the work?
ing of a propeller turbine and a jet turbine.
Section-C
Attempt any two question. Each question carries equal marks.
Q3.
(2x15=30)
The following data refer to a single stage impulse turbine:
Isentropic nozzle heat drop = 251 kJ/kg : nozzle e?iciency
= 90% : nozzle angle = 20? : ratio of blade speed to whirl
component of steam speed = 0.5 : blade velocity co-ef?-
cient = 0.9 ; the velocity of steam entering the nozzle =
20m/s. Determine:
(i) The blade angles at inlet and outlet if the steam enters
in to the blades without shock and leaves the blades
in an axial direction.
(4)
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Q4.
Q5.
(ii) Blade e?iciency
(1h) Power developed and axial thrust in an axial direction
(a) Why are the back work ratios relatively high in gas tur-
bine plants compared to those of steam power plants?
(b) In a gas turbine plant compression is carried out in two
stages with perfect intercooling and expansion in one
stae turbine. If the maximum temperature
(Tm, K) and minmum temperature (Tm, K) in the
cycle remain constand, show that for maximum
speci?c output of the plant, the optimum overall pressure
ratio is given by
1?0pl = ("1' nc. Tm/Tmyy/sq?l)
Where 7 ? Adiabatic index : nT= Isentropic ef?ciency of
the turbine.
TIC = Isentropic ef?ciency of compressor.
A boiler generate 7.5 kg of steam per kg of coalfbumt at a
pressure of 11 bar, ?om feed water having a temperature of
70?C. The ef?ciency of boiler is 75% and factor of evapora-
tion 1.15. speci?c heat of steam at constant pressure is 2.3.
Calculate:
(5) P.T.O.
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(i) Degree of superheat and temperature of steam gener-
ated;
(in) Calori?c value of coal in kJ/kg;
(iii) Equivaleni evaporation in kg of steam per kg of coal.
(6)
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This post was last modified on 29 January 2020