ME6301 Engineering Thermodynamics Important Questions Nov Dec 2017 Exam
ME6301 Engineering Thermodynamics Important Questions Nov Dec 2017 Part B & Part C Important Questions
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Anna
University Exams Nov / Dec 2017 – Regulation 2013
Important Questions – 3rd Semester BE/BTECH
ME6301-
ENGINEERING THERMODYNAMICS
Unit 1
1.
1. A piston and cylinder machine consists of a fluid system which passes
through a complete cycle of four process.
During
the cycle the sum of all heat transfer is -170 kJ. The system completes 100
cycles per minute. Complete the
following
Table showing the method for each item and compute the net rate of work output
in KW
2.
2 5kg of air at 400 C and 1 bar is heated in reversible non-flow constant
pressure until the volume is doubled.
Find
(a) change in volume (b) work done (c) change in internal energy and (d) change
in enthalpy.
3.
0.25kg of air at a pressure of 1 bar occupies as volume of 0.3m3
.
if this air expands isothermally to a volume of 0.9m3
Find
(i) the initial temperature, (ii) the final temperature (iii) external work
done, (iv) Heat absorbed by the air, (v)
change
in internal energy. Assume R=0.29kJ/kg K.
4.
1.5kg of certain gas at a pressure of 8 bar and 200C occupies the volume of 0.5
m3
.
It expands adiabatically to a
pressure
of 0.9 bar and volume 0.73 m3
.
Determine the work done during the process, gas constant, ratio of the
specific
heats, values of two specific heats, change in internal energy and change in
enthalpy.
5.
A cylinder contains 1 m3 of gas at 100 kPa and 1000C, the gas is polytropically
compressed to a volume of 0.25 m3
,
the
final
pressure is 600kPa. Determine (a) mass of the gas (b) the value of index ‘n’
for compression (c) change in internal
energy
of the gas (d) heat transferred by the gas during compression. Assume R=0.287
kJ/kg and 1.4.
6.
A steam turbine operates under steady flow conditions receiving steam at the
following state: Pressure 15 bar.
Specific
volume 0.17m3
/kg
internal energy 2700 KJ/kg velocity 100 m/s. The exhaust of steam from the
turbine is at
0.1bar
with internal energy 2175 KJ/kg. specific 15 m3
/kg
and velocity 300 m/s. The intake is 3 m above the exhaust.
The
turbine develops 35 kW and heat loss over the surface of turbine is 20 KJ /kg.
Determine the steam flow rate
through
the turbine.
7.
A reciprocating air compressor takes in 2 m3/min air at 0.11 MPa, 293 K which
it delivers at 1.5 MPa, 384 K to an after
cooler
where the air is cooled at constant pressure to 298 K. The power absorbed by
the compressor is 4.15 kW.
Determine
the heat transfer in (i)the compressor (ii) the cooler. State your assumptions
Unit II
1.
A heat engine is used to drive a heat pump. The heat transfer from the heat
engine and from the heat pump is used
to
heat the water circulating through the radiators of building. The efficiency of
the heat engine is 27% and COP of
the
heat pump is 4. (i) Draw the neat diagram of the arrangement and (ii) evaluate
the ratio of heat transfer to the
circulating
water to the heat transfer to the heat engine.
2.
A carnot heat engine takes heat from an infinite reservoir at 5500C. Half of the
work delivered by the engines used to
run
generator and the other half if used to run heat pump which takes heat at 2750C
and rejects it at 4400C. Express
the
heat rejected at 4400C by the heat pump as % of heat supplied to the engine at
5500C. If the operation of the
generator
is 500kW, find the heat rejected per hour by the heat pump at 4400C.
3.
0.2kg of air at 1.5bar and 27 C is compressed to a pressure o 15 bar according
to the law PV1.25= Constant. Determine
work
done on or by air, eat flow to or from the air, increase or decrease in
entropy.
4.
Air is closed vessel of fixed volume 0.15m3
,
exerts pressure of 12bar at 250 C. If the vessel is cooled so that the
pressure
falls to 3.5 bar, determine the final temperature, heat transfer and change of
entropy.
5.
Two reversible heat engines A and B are arranged in series. A rejecting heat
directly to B. Engine receives 200kJ at a
temperature
of 4210C from hot source, while engine B is in communication with a cold sink
at a temperature of
4.4oC.
If the work output of a A is twice that of B, Find:1. The intermediate
temperature between A and B. 2. The
efficiency
of each engine. 3. The heat rejected to the cold sink.
6.
An aluminium block (cp =400J/kgK) with a mass of 5 kg is initially at 40°C in
room air at 20°C. It is cooled reversibly by
transferring
heat to a completely reversible cyclic heat engine until the block reaches
20°C. The 20°C room air serves
as
a constant temperature sink for the engine. Compute (1) The change in entropy
for the block, (2) The change in
entropy
for the room air, (3) The work done by the engine.
7.
One kg of air is contained in a piston cylinder assembly at 10 bar pressure and
500 K temperature. The piston moves
outwards
and the air expands to 2 bar pressure and 350 K temperature. Determine the
maximum work obtainable.
Assume
the environmental conditions to be 1 bar and Also make calculations for the
availability in the initial and
final
states.
Unit III
1.
A closed vessel of 0.2m3
contains
steam at 1 MP and temperature 2500C. If the vessel is cooled so the pressure
falls
to
350 kPa. Determine the final temperature, heat transfer and change of entropy
during the process
2.
Steam at 10 bar and 0.85 dry expands according to the law pv1.2 = C to a final
pressure of 1 bar. Determine a) final
volume
b) final enthalpy
3.
Steam at 15 bar and 3000C is expanded hyperbolically to a pressure of 5 bars.
Calculate change in internal energy and
work
done during the process.
4.
150 kg / s steam at 25 bars and 300oC expands isentropically in a steam turbine
to 0.3 bars. Determine the
power
output of the turbine.
5.
Steam at 30 bar and 350oC is expanded in a non flow isothermal process to a
pressure of 1 bar. The temperature and
pressure
of the surroundings are 25oC and 100 kpa respectively. Determine the maximum
work that can be obtained
from
this process per kg of steam. Also find the maximum useful work and change in
availability.
6.
Consider a steam power plant operating on the ideal Rankine cycle. Steam enters
the turbine at 3 MPa and 623 K
and
is condensed in the condenser at a pressure of 10 kPa. Determine (i) the
thermal efficiency of this power plant,
(ii)
the thermal efficiency if steam is superheated to 873 K instead of 623 K, and
(iii) the thermal efficiency if the
boiler
pressure is raised to 15 MPa while the turbine inlet temperature is maintained
at 873 K
7.
In a reheat cycle, the initial steam pressure and the maximum temperature are
150 bar and 550°C respectively. If the
condenser
pressure is 0.1 bar and the moisture at the condenser inlet is 5%, and assuming
ideal processes, determine
(i)
the reheat pressure, (ii) the cycle efficiency, and (iii) the steam rate.
Unit IV
1.
Derive the T-ds relations.
2.
Derive the equation for Maxwell’s relations.
3.
Derive the Clausius Clapeyron equation.
4.
Explain and derive the Joule –Thomson coefficient.
5.
A Vessel of volume 0.28 m3 contain 10 kg of air at 302K. determine the pressure
exerted by the air using 1. Perfect
gas
equation 2. Vander Waals equation 3. Generalised compressibility chart. [Tale
Critical temperature of air is 132.8
K;
Critical pressure of air is 37.7 bar]
6.
Consider an ideal gas at 303K and 0.86 m3/kg. As a result of some disturbance
the state of the gas changes to 304 K
and
0.87 m3/kg. Estimate the change in pressure of the gas as the result of this
disturbance.
7.
Verify and validate of Maxwell’s Relation, (ds/dp)T = - (dv/dT)p for steam at
300oC and 500kPa.
Unit V
1.
An air conditioning unit receives an air – water vapour mixture at 101 kpa,
35oC and 80% relative humidity. a)
The
dew point b) The humidity ratio c) The partial pressure of air d) The mass
fraction of water vapour.
2.Air
has a dry bulb temperature of 25 C and wet bulb temperature of 15 C. If the
barometer reads 1 bar,
calculate
1. Vapour pressure Specific humidity 3.Saturation ratio 4.Relative humidity
5.Drew point
temperature
6.Vapour density 7.Enthalpy of mixture.
2.
An air – water vapour mixture at 30oC and me am has a relative humidity of 60
per cent. Obtain 1. The
humidity
ratio 2. The specific volume 3. The enthalpy in KJ / kg dry air 4. The dew –
point. Using
psychrometric
chart.
3.
Air is at 37 C dry bulbs and 15% relative humidity. The air is to be cooled by
evaporation cooling until the
relative
humidity is 60%. Determine 1. The final temperature 2. For 0.5 m3
/s
of air, the water required.
4.
Moist air at 32 C and 60% relative humidity enters the cooling coil of a
dehumidifier with a flow rate of
115kg
air/min. The air leaves saturated at 10 C calculated the condensate removed and
the tons of
refrigeration
required.
5.
The atmospheric air has a dry bulb temperature of 20 C and specific humidity of
0.0095 kg/kg of dry air.
If
the barometer reads 760mm of Hg. Determine 1.Partial pressure of vapour 2.
Relative humidity 3.
Dew
point temperature.
6.
Saturated air at 20oC at a rate of 1.167 m3
/sec
is mixed adiabatically with the outside air at 35oC and 50%
relative
humidity at a rate
0.
5 m3
/sec.
Assuming adiabatic mixing condition at 1 atm. Determine specific humidity, relative
humidity,
and
dry bulb temperature and volume flow rate of the mixture .
8.
An air conditioning system is designed under the following condition: Outdoor
condition-32oC DBT and 75%
RH
Required Indoor
condition-
220C DBT and 70 % RH Amount of free air circulated- 200 m3
/min
Coil dew point temperature140C.
The
required condition is first achieved by cooling and dehumidifying and then by
heating. Calculate
the
following i) Capacity of cooling coil in Tonne ii) Capacity of heating coil in
KW iii) Mass of water vapour
removed
in kg/s .
9.
Air at 40°C DBT and 27°C WBT is to be cooled and dehumidified by passing it
over a refrigerant coil to give
a
final condition of 15°C and 90% RH. Find the amounts of heat and moisture
removed per kg of dry air.
10.
Explain the process of heating and humidification process.
11.
Explain with an example evaporative cooling .
12.
A Mixture of 2 kg Oxygen (M=32kg/kgmol) and 2kg argon (m=40 Kg/kmd) is present
in an insulated piston in
cylinder
arrangement at 100kpa, 300K. The piston now compresses the mixture to half of
its initial volume.
Find
the final pressure, temperature and piston work, assume c, for oxygen and argon
for oxygen and argon
as
0.6618kj/kgk and 0.3122KJ/kgK respectively.
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ME6301- ENGINEERING THERMODYNAMICS - Important Questions - Download Now ( Updated ) >>
Semester : 03
Department : Mechanical Engineering (MECH)
Year : Second Year (II Year)
Regulation : 2013
Subject Code : ME6301
Subject Name : Engineering Thermodynamics
Content : ME6301 Engineering Thermodynamics - Important Part A 2 Marks Questions and Important Part B 16 Mark Questions
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