QUESTION BANK
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Question No. |
Questions |
Bloom’s Level |
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PART-A (Two Marks Questions) |
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UNIT 1 - BASIC CONCEPTS OF THERMODYNAMICS |
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1 |
Define the
term “Thermodynamics”. |
BT1 |
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2 |
Define
the term “An open system”. |
BT1 |
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3 |
Define
the term “A closed system”. |
BT1 |
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4 |
Define the term “An isolated system”. |
BT1 |
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5 |
What is meant by intensive properties
and give some examples. |
BT1 |
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6 |
What is meant by extensive properties and give some
examples. |
BT1 |
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7 |
Define the term “Continuum”. |
BT1 |
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8 |
What is meant by Macroscopic viewpoints? |
BT1 |
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9 |
What is meant by Microscopic viewpoints? |
BT1 |
|
10 |
What is meant by reversible cycle? |
BT1 |
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11 |
What is meant by irreversible
cycle? |
BT1 |
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12 |
Explain briefly “Quasi-static process”. |
BT1 |
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13 |
Define
the term “Mechanical equilibrium”. |
BT1 |
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14 |
Define
the term “Thermal equilibrium”. |
BT1 |
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15 |
Define
the term “Chemical equilibrium”. |
BT1 |
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UNIT 2 - FIRST LAW OF THERMODYNAMICS |
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1 |
Define
the term “State of a system”. |
BT1 |
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2 |
What is
meant by Point function? |
BT1 |
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3 |
What is
meant by Path function? |
BT1 |
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4 |
State
“Law of conservation of energy”. |
BT1 |
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5 |
Define
the term “Potential energy”. |
BT1 |
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6 |
Define
the term “Kinetic energy”. |
BT1 |
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7 |
Define
the term “Internal energy”. |
BT1 |
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8 |
Define
the term “Heat” and how it can transferred in different distinct
ways? |
BT1 |
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9 |
Define
the term “Specific heat”. |
BT1 |
|
10 |
Define
the term “Thermal capacity”. |
BT1 |
|
11 |
What is meant by water equivalent? |
BT1 |
|
12 |
State
“Zeroth law of thermodynamics”. |
BT1 |
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13 |
State “First law of thermodynamics”. |
BT1 |
|
14 |
What are the
limitations of first law of thermodynamics? |
BT1 |
|
15 |
Write the
relationship between Cp and Cv? |
BT2 |
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UNIT 3 - SECOND LAW OF THERMODYNAMICS AND
THERMODYNAMIC RELATIONS |
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1 |
Write the
name of two statements in second law of thermodynamics. |
BT1 |
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2 |
State “Kelvin - Planck statement”
in second law of thermodynamics. |
BT1 |
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3 |
State “Clausius statement”
in second
law
of thermodynamics. |
BT1 |
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4 |
What are the
various thermodynamics process involved in Carnot cycle? |
BT1 |
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5 |
Why Carnot
cycle efficiency is higher than all other cycles? |
BT1 |
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6 |
Why Carnot
cycle cannot be performed in practice? |
BT1 |
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7 |
A Carnot
engine working between 650K and 310K, produces 150 kJ of work. Find thermal
efficiency and heat added during the process. |
BT2 |
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8 |
An engine operating on a Carnot cycle works with in
temperature limits of 600K and 300K. If the engine receives 2000 kJ of heat.
Evaluate the workdone and thermal efficiency of the engine.
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BT2 |
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9 |
A Carnot cycle operates between source and sink
temperature of 250°C and -15°C respectively. If the system receives 90 kJ
from the source. Find: (i) efficiency of the system and (ii) the net work
transfer. |
BT2 |
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10 |
A
cyclic heat engine operates a source temperature of 100°C and a Sink
temperature of 40°C. Find the least rate of heat rejection per kw net output
of the engine. |
BT2 |
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11 |
Define
the term “Entropy”. |
BT1 |
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12 |
State
“Clausius inequality”. |
BT1 |
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13 |
State “Third
law of thermodynamics”. |
BT1 |
|
14 |
Define the term
“Helmholtz function”. |
BT1 |
|
15 |
Define the term “Gibbs
function”. |
BT1 |
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UNIT 4 - PROPERTY OF PURE SUBSTANCES AND
POWER CYCLES |
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1 |
What is
meant by pure substance? |
BT1 |
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2 |
Define the term “Latent heat of
ice”. |
BT1 |
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3 |
Define the term “Sensible heat of water”. |
BT1 |
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4 |
What is
meant by wet and dry steam and which term is used denoted for it? |
BT1 |
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5 |
Define the term “Latent heat of vaporization”. |
BT1 |
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6 |
What is meant by superheated steam and
indicate its use. |
BT1 |
|
7 |
Define the
terms “Degree
of
super heat”. |
BT1 |
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8 |
What is
meant by triple point and indicate in diagram. |
BT1 |
|
9 |
What is meant by PVT surface? |
BT1 |
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10 |
What is
meant by critical point for pure substance? |
BT1 |
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11 |
Define the term “Stroke volume”. |
BT1 |
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12 |
What is the necessity of providing clearance volume
in an IC engines? |
BT1 |
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13 |
What is meant by total volume? |
BT1 |
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14 |
Define the term “Compression ratio”. |
BT1 |
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15 |
Define the term “Cutoff ratio”. |
BT1 |
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UNIT 5 - REFRIGERATION AND AIR
CONDITIONING |
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1 |
What is meant by refrigeration and
air conditioning? |
BT1 |
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2 |
Define the term ‘Unit of refrigeration’. |
BT1 |
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3 |
What is meant by relative COP? |
BT1 |
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4 |
Explain the term “Tonne of
refrigeration”. |
BT1 |
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5 |
A machine
working on reversed Carnot cycle operates between 300C and -150C.
Determine COP, when it is operated as refrigerator. |
BT2 |
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6 |
A
refrigerating machine working on reversed Carnot cycle consumes 6kW for
producing refrigerating effect of 1000kJ/min. Determine the COP of machine. |
BT2 |
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7 |
Describe the essential components of the refrigeration
plant. |
BT1 |
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8 |
Draw the T-S and p-h diagram for vapour compression
refrigeration systems. |
BT1 |
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9 |
How the refrigerants are
classified?
|
BT1 |
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10 |
List out some name of
secondary refrigerants used in refrigeration systems.
|
BT1 |
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11 |
State the desirable properties of ideal refrigerants.
|
BT1 |
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12 |
Classify air
conditioning systems.
|
BT1 |
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13 |
Define room sensible
heat factor (RSHF).
|
BT1 |
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14 |
What are the factors
affecting optimum effective temperature?
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BT1 |
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15 |
What are the factors
affecting human comfort?
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BT1 |
QUESTION
BANK
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Question No. |
Questions |
Bloom’s
Level |
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PART-B
(Ten Marks Questions) |
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UNIT
1 - BASIC CONCEPTS OF THERMODYNAMICS |
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|
1 |
A fluid at of pressure of 3 bar and with volume of
0.18 m³/kg contained in cylinder behind a piston expands reversibly to a
pressure of 0.6 bar. According to law a P = C/V2, where C is a constant.
Calculate the workdone by the fluid on the piston. |
BT4 |
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2 |
A temperature scale of certain thermometers is given
by the relation: t = a ln(p) + b, where ‘a’ and ‘b’ are constant and
‘p’ is the thermometric property of the fluid in the thermometer. If at the
ice point and steam point of the thermometric properties are found to be 1.5
and 7.5 respectively. What will be the temperature corresponding to the
thermometric property of 3.5 on Celsius scale. |
BT4 |
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3 |
A temperature scale of certain thermometers is given
by the relation: t = a ln(k) + b, where ‘a’ and ‘b’ are constant and
‘k’ is the thermometric property of the fluid in the thermometer. If at the
ice point and steam point of the thermometric properties are found to be 1.83
and 6.78 respectively. What will be the temperature corresponding to the
thermometric property of 2.42 on Celsius scale. |
BT4 |
|
4 |
Prove that Cp-Cv=R and determine the relationship
between Cp, Cv, R and also find the adiabatic index (γ). |
BT2 |
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5 |
The properties of a closed system change following
the relation between pressure and volume as PV=3, where p in bar, V in m3.
Calculate the workdone when the pressure increases from 1.5bar to
7.5bar. |
BT4 |
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6 |
A barometer reads 76cm of Hg. What would be the
absolute pressure if; (i) A pressure gauge connected to turbine
inlet reads 28bar and (ii) A vacuum gauge connected in the outlet
line of the same turbine reads 70cm of
Hg. |
BT4 |
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7 |
Determine the work done by the air which enters into
an evacuated vessel from atmosphere when the valve is opened. The atmosphere
pressure is 1.013 bar and 1.5m³ air at atmosphere condition enters into the
vessel. |
BT4 |
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8 |
A mass of 1.5kg air is compressed in a quasi-static
process from 0.1MPa to 0.7MPa for which PV = constant. The initial density of
air is 1.16 kg/m³. Find the workdone by the piston to compress the air. |
BT4 |
|
9 |
During the compression stroke of reciprocating
compressor, the workdone to the air in the cylinder is 95 kJ/kg and 43 kJ/kg
of heat is rejected to the surroundings. Determine the change in internal
energy. |
BT4 |
|
10 |
State law’s of perfect gases and how the laws are
governed by variables? |
BT2 |
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UNIT
2 - FIRST LAW OF THERMODYNAMICS |
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1 |
State the first law of thermodynamics and prove that
first law is the law of conservation of energy for a non-flow process and it
leads to the energy equation δQ = dU+δW. |
BT2 |
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2 |
A stationary mass of gas is compressed without
friction from an initial state of 0.3 m³ and 0.105 MPa to a final state of
0.15m³ and 0.105 MPa. The pressure remains constant during the process. There
is a transfer of 37.6 kJ of heat from the gas during the process. How much
does the internal energy of the gas change? |
BT4 |
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3 |
A mass of 0.25 kg of air in a closed system from 2
bar, 600C to1 bar, 40°C, while receiving 1.005kJ of heat from a
reservoir at 1000C. The surrounding atmosphere is at 0.95 bar and
270C. Determine the maximum work. |
BT4 |
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4 |
List out the heating and expansion of gases in
non-flow processes and derive the expression for P-V-T relation, workdone,
change in internal energy, heat supplied and change in enthalpy by using
constant volume process. |
BT2 |
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5 |
List out the heating and expansion of gases in
non-flow processes and derive the expression for P-V-T relation, workdone,
change in internal energy, heat supplied and change in enthalpy by using
constant pressure process. |
BT2 |
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6 |
A certain gas occupies a space of 0.3m³ at a
pressure of 2 bar and temperature of 77oC. It is heated at a
constant volume until the pressure is 7 bar. Determine: (i) temperatures at
the end of the process, (ii) mass of the gas, (iii) change in internal energy
and (iv) change in enthalpy during the process. Assume Cp =1.005 kJ/kg.K, Cv=0.712kJ/kg.K. |
BT4 |
|
7 |
The values of specific heats at constant pressure
and at constant volume for an ideal gas are 0.984 kJ/kg.K and 0.728 kJ/kg.K.
Find the values of characteristic gas constant (R) and ratio of specific
heats for the gas. If 1 kg of this gas is heated at constant pressure from
25°C to 200°C. Estimate the heat added, ideal workdone and change in internal
energy. Also calculate the pressure and final volume. If the initial volume
was 2m³. |
BT4 |
|
8 |
Derive the expression application of first law of
thermodynamics to a steady flow process. |
BT2 |
|
9 |
Derive the steady flow energy equations for the
flowing applications in engineering systems: (i) Boiler, (ii) Nozzle and
(iii) turbine. |
BT2 |
|
10 |
Derive the steady flow energy equations for the
flowing applications in engineering systems: (i) Evaporator, (ii) Condenser
and (iii) Compressor. |
BT2 |
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UNIT
3 - SECOND LAW OF THERMODYNAMICS AND THERMODYNAMIC RELATIONS |
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1 |
State the second law of thermodynamics and find COP
of heat pump and refrigerator. |
BT2 |
|
2 |
Derive the expression for Carnot cycle and what
reasons it cannot be performed in practice? |
BT2 |
|
3 |
Derive the
expression of change in entropy of a perfect gas in the process of constant
volume. |
BT2 |
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4 |
Derive the
expression of change in entropy of a perfect gas in the process of constant
pressure. |
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|
5 |
Derive the
expression of change in entropy of a perfect gas in polytropic process. |
BT2 |
|
6 |
A
vessel of 2.5m3 capacity contains 1kg-mole of nitrogen at 1000C.
If the gas cooled to 300C. Calculate the change in specific
entropy. The ratio of specific heats is 1.4 and 1kg-mole nitrogen is 28kg. |
BT4 |
|
7 |
Cold
air from atmosphere is circulated through an air heating system, where the
temperature of air is increased from 7.20C to 21.20C
without any pressure loss. If the hourly consumption of warm air at 21.2°C is
850m³. Calculate: (i) how much heat per hour must be imparted to the air,
(ii) what will be the change in entropy of air circulated per hour? Assume
proper values of the specific heat of air. |
BT4 |
|
8 |
A fluid
undergoes a reversible adiabatic compression from 4bar, 0.3m3 to
0.08m3. According to the law, PV1.25=C. Determine: (i)
change in enthalpy, (ii) change in internal energy, (iii) change in entropy
and (iv) heat and work transfer during the process. |
BT4 |
|
9 |
Drive the expression of “Maxwell
equations”. |
BT2 |
|
10 |
Explain about the “Helmholtz function”
and “Gibbs function” and determine the workdone of these functions. |
BT2 |
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UNIT
4 - PROPERTY OF PURE SUBSTANCES AND POWER CYCLES |
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|
1 |
Explain about
the formation of steam with the help of T-dQ diagram. |
BT2 |
|
2 |
Explain the
following indicator diagram for a pure substance: (i) Pressure - Temperature (P-T), (ii) Temperature - Volume (T-V), and (iii) Temperature – Specific Enthalpy (T-h), |
BT2 |
|
3 |
Explain the
following indicator diagram for a pure substance: (i) Pressure - Volume - Temperature (P-V-T)
surface and (ii) Specific Enthalpy - Specific Entropy(h-S) |
BT2 |
|
4 |
Find
the dryness fraction, specific volume and specific internal energy of steam
at 7bar and enthalpy 2550 kJ/kg. |
BT4 |
|
5 |
Two boilers one with superheater and other without
superheater are delivering equal quantities of steam into a common main. The
pressure in the boilers and main is 20 bar. The temperature of steam from a
boiler with a superheater is 350°C and temperature of the steam in the main
is 250°C. Determine the quality of steam supplied by the other boiler. Take;
Cps =2.25 kJ/kg.K |
BT4 |
|
6 |
Explain the measurement of dryness
fraction of steam by using bucket calorimeter. |
BT2 |
|
7 |
Explain the construction and working of an Otto
cycle. |
BT2 |
|
8 |
Explain the construction and working of a Diesel
cycle. |
BT2 |
|
9 |
Distinguish between air standard cycle and actual cycle. |
BT2 |
|
10 |
Distinguish between Otto cycle and Diesel cycle. |
BT2 |
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UNIT
5 - REFRIGERATION AND AIR CONDITIONING |
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|
1 |
Explain the
main components in vapour compression refrigeration system with neat sketch. |
BT2 |
|
2 |
Explain with a
flow diagram, the working of aqua-ammonia vapour absorption refrigeration
system. |
BT2 |
|
3 |
Explain about
physical, safe working and thermodynamic properties of a ideal refrigerant? |
BT2 |
|
4 |
List out the
various psychrometric properties of air and explain each. |
BT2 |
|
5 |
Draw the psychrometric chart and mention
the Psychrometry properties in it. |
BT2 |
|
6 |
200 m3 of air at 15°C dry
bulb temperature and 75% relative humidity is heated until its temperature is
250C. Find: (i) relative humidity of heated air, (ii) wet bulb
temperature of heated air and (iii) Heat added to air/min. |
BT4 |
|
7 |
Atmosphere air at a dry bulb temperature
of 16°C and 25% relative humidity passes through a furnace and then through a
humidifier, in such a way that the final dry bulb temperature is 300C
and relative humidity 50%. Find the
heat and moisture added to the air. Also determine the sensible heat factor
of the process. |
BT4 |
|
8 |
Atmosphere air at 30°c dry bulb
temperature and 45% relative humidity is to be conditioned to 17°C dry bulb
temperature and 15°C wet bulb temperature. Find the amount of heat rejected
by the air. Also find the sensible heat factor of the process. |
BT4 |
|
9 |
One kg of air at 400C dry
bulb temperature and 50% relative humidity is mixed with 2kg of air at 200C
dry bulb temperature and 200C dew point temperature. Calculate the
temperature and specific humidity of the mixture. |
BT4 |
|
10 |
Define the term “Effective
temperature” and mention the factors affecting optimum effective temperature.
|
BT2 |
Note: Bloom’s
Taxonomy
|
Bloom’s Level |
Descriptions |
Bloom’s Level |
Descriptions |
|
BT 1 |
Remember |
BT 2 |
Understand |
|
BT 3 |
Apply |
BT 4 |
Analyze |
|
BT 5 |
Evaluate |
BT 6 |
Create |
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Prepared by |
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Mr. R.Satheesh Associate Professor |
