ME 2202- ENGINEERING THERMODYNAMICS
QUESTION BANK
UNIT-I
BASIC CONCEPT & FIRST LAW
PART –A (2 marks)
1.
Define the term thermal engineering.
2. What
is meant by thermodynamics system? How do you classify it?
3. What
is meant by closed system? Give an example.
4.
Define an open system Give an example.
5.
Distinguish between Open and Closed system
6.
Define an isolated system:
7.
Define specific heat capacity at constant pressure.
8.
Define specific heat capacity at constant volume.
9. What
is meant by surroundings?
10.
What is boundary?
11.
What is meant by thermodynamic property
12. How
do you classify the property?
13.
Define Intensive and Extensive properties.
14.
What do you understand by equilibrium of a system?
15.
Differentiate Intensive and Extensive properties
PART –B
1. one
kg of gas expands at CO&11stant pressure from 0.085 m3 to 0.13 Ill).if the
initial
temperature
of the gas is 22.5 °c. find the final. Temperatures, net heat transfer, change
in
internal
energy, pressure of gas. (16)
2. A
certain quantity of gas is head at constant pressure from 35 °0 to 185°c.
Estimate the
amount
of hem transferred, ideal work done, change in internal energy, when the
initial volume of
the gas
is 0.6 m3. (16)
3.
Explain and derive Isothermal process (16)
4.
Explain and derive Isobaric process. (16)
5. 2kg
of gas at a pressure of 1.5 bar. Occupies a volume of 2.5 m3. If this gas
compresses
isothermally
to 1/3 times the initial volume. Find initial. Final temperature, work done,
heat
transfer.
(16)
6. one
kg of air is compressed polytropically (n=1.3) from 1 bar and 27 deg Celsius
to 3
bar. Find I. work transfer , 2.Heat transfer,3. Change in internal energy (16)
UNlT-2
SECOND LAW
PART –A (2 marks)
1.
State the Kelvin - Planck statement of second law of thermodynamics.
2.
State Clausius statement of second law of thermodynamics.
3.
Write the two statements of the Second law of thermodynamics.
4.
State Carnot's theorem.
5. What
are the Corollaries of Carnot theorems?
6.
Define - PMM of second kind.
7. What
is difference between a heat pump and refrigerator?
8.What
is mean by heat engine?
9.
Define the term COP.
10. Why
Carnot cycle cannot be realized in practice?
11.
Name two alternative methods by which the efficiency of a Carnot cycle can be
increased.
12. Why
a heat engine cannot have 100% efficiency
13.
When the Carnot cycle efficiency will be maximum?
14.
What are the processes involved in Carnot cycle
PART –B
1. Air
flows through an adiabatic compressor at 3 kg/s the inlet conditions are 2 bar
and 310k
and
exit conditions are 20 bar and 560 k. compute the net rate of availability
transfer and
irreversibility.
(16)
2. Air
in a closed vessel of fixed volume of 0.15 m 3, exerts pressure of 12 bar 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. (16)
3.
Explain Carnot engine cycle and its efficiency. (16)
4.
Explain the term availability and unavailability. (16)
5. A
heat engine operates between a source a 600 °c and a sink at 60 c Determine the
least rate
of heat
rejection per KW net output of the engine. (16)
6. 0.2
kg of air at 1.5 bar and 27 "c is compressed to a pressure of 15 bar
according to the law
pv
(l.25) =c. determine work done heat flow to or from the air, increase or
decrease in entropy
(16)
UNIT- 3
PROPERTIES OF PURE SUBSTANCE & STEAM POWER CYCLE
PART –A (2 marks)
1.Define
latent heat of ice.
2. What
is pure substance?
3. What
is saturation temperature and saturation pressure?
4.
Define latent Heat of vaporization.
5. Find
the saturation temp and latent heat of vaporization of steam at 1 Mpa.
6.
Define the terms 'Boiling point' and 'Melting point .
7. What
is meant by super heated steam and indicate its use.
8.
Define: sensible heat of water.
9.
Define the term "Super heat enthalpy".
10.
What are wet and dry steam?
11
State phase rule of pure substances.
12.
Define dryness fraction of steam (or) What is quality of steam?
13.
Explain the terms: Degree of super heat, Degree of sub cooling.
14.
Define triple point and critical point for pure substance.
PART –B
1. Find
the specific volume and enthalpy of steam at 9 bar when the condition of steam
is
a) Wet
with dryness fraction 0.95 b) dry saturated c) super heated temperature of 240°
(16)
2.
Steam initially at 400 Kpa and 0.6 dry is heated in a rigid vessel of 0.1m3
volume. The final
condition
is 600 Kpa. Find the amount of heat added and mass of steam. (16)
3.
Explain P-V diagram and P-V-T surface. (16)
4. 2 kg
of steam initially at 5 bar and 0.6 dry is heated at constant pressure until
the temperature
becomes
350 c.find the change in entropy and internal energy. (16)
5.A
steam plant working on a simple rankine cycle operated between the temperature
of 260°c
and
95°c .the steam is dry and saturated when it enters the turbine and expanded
isentropic ally.
Find
rankine efficiency. (16)
6) 2.5
kg of steam is heated at constant pressure of 250 kpa and 100°c, until
temperature is
250°c.
Find the amount of heat added and change in entropy. (16)
(Use
mollier chart)
UNIT – 4
IDEAL AND REAL GASES AND
THERMODYNAMIC RELATION
PART –A (2 marks)\
1.
Determine the molecular volume of any perfect gas at 600N/m2 and 300 C.
Universal gas
constant
may be taken as 8314J/kg mole-K.
2.
State Boyle's law.
3.
State Charle's law.
4.
State Joule's law.
5.
State Regnault's law.
6. State
Avogadro's law.
7.
State Dalton's law of partial pressure
8. How
does the Vander Waals equation differ from the ideal gas equation of state?
9. What
is meant by virtual expansion?
10.
Distinguish between ideal and real gas.
11.
Define Joule-Thomson Co-efficient.
12.
Define Co-efficient of volume expansion and Isothermal compressibility.
13.
What is compressibility factor?
14.
What is compressibility factor? What does it signify? What is its value for an
ideal gas at
critical
point?
PART –B
.1.
Derive Dalton’s law of partial pressure. Define amagats law of partial volume.
(16)
2.
Derive vandar Waals equation. (16)
3.
Derive Maxwell’s equation (16)
4.
Derive clausius-clapeyron equation. (16)
5.
Derive Joule-Thomson coefficient equation. (16)
6. A
mixture of gases contains 50%nitrogen,40% oxygen and 10% carbon di oxide by
mass. 2
kg of
mixture is compressed from 200 kpa and 293k to 400 kpa polytropically which
follows
the
PV(I.25)=C. Determine the work done, heat transferred and change in entropy.
(Take
(cp)n2=1.04 (cp)o2= 0.918 kj / kg k, (cp)co2=O.846 k/k (16)
UNIT – 5
PSYCHROMETRY
PART –A (2 marks)
1. What
is the difference between air conditioning and refrigeration?
2.
Define psychrometry.
3.
Define dry bulb temperature (DBT).
5.
Define wet bulb temperature.
6.
Define dew point temperature.
7.
Define Relative Humidity (RH) and Specific humidity'.
8.
Differentiate between absolute and relative Humidity.
9.
Define DPT and degree of saturation.
10.
What is dew point temperature? How is it related to dry bulb and wet bulb
temperature at the
saturation
condition?
11.
Define Apparatus Dew Point (ADP) of cooling coil.
12.
List down the psychrometirc processes.
13.
Define bypass factor (BPF) of a coil.
14.
State the effects of very high and a very low bypass factor.
15.
What are the assumptions made while mixing two air streams
PART –B
I. Dry
bulb and wet temperatures of 1 atmospheric air stream are 40°0 and 30°c
respectively.
Determine
(a)Humidity
(b) Relative humidity (c) Specific humidity. (16)
2.
Atmospheric air with barometric pressure of 1.013 bar has 38°c dry bulb
temperature
and
28°c wet bulb temperature. Determine (a) Humidity ratio (b) Relative humidity (c)
dew
point
temperature. (16)
3.
Atmospheric air at 760 mm of Hg has 45°c DBT and 30°c WBT, using psychometric
chart
calculate R.H, Humidity ratio, DPT, enthalpy, specific volume of air. (16)
4.Atmospheric
air at 1 bar pressure has 2.5°0 DBT and 75% RH using psychometric chart,
calculate
DBT, enthalpy, vapour pressure. (16)
5.
Explain sensible heating process, sensible cooling, and humidification process.
(16)
6. An
air water vapour mixture at 0.1 Mpa, 30°0, 80% RH. Has a volume of 50 m3
Calculate
the specific humidity, dew point, wet bulb temperature, mass of dry air and
mass of
water
vapour. (16)
7.Calculate the specific humidity, dew point, wet bulb
temperature, mass of dry air and mass of
water
vapour. (16)
