Engineering Thermodynamics MCQ (Multiple Choice Questions)
1. The energy of an isolated system is
a) Always decreasing
b) Always constant
c) Always Increasing
d) None of the above
2. The thermodynamics work done by the system on the surrounding is considered as
a) Positive
b) Negative
c) Neutral
d) None of the above
3. When the heat transfer into a system is more than the work transfer out of the system then
a) The internal energy of the system remains constant
b) The internal energy of the system remains decreases
c) The internal energy of the system remains increases
d) None of the above
4. First law of thermodynamics provide
a) A statement that energy balance occurs when a system undergoes a change of state or the process
b) A statement about whether the change of state or the process is at all feasible or not
c) Both (a) & (b)
d) None of the above
5. The thermodynamics cycle in which net heat is transferred to the system and net work is transferred from the system is called as
a) Refrigeration cycle
b) Heat engine cycle
c) Both (a) & (b)
d) None of the above
6. A thermal energy reservoir (TER) has
a) A finite heat capacity
b) An infinite heat capacity
c) A finite mass
d) None of the above
7. Two reversible adiabatic paths
a) Can intersect with each other
b) Cannot intersect with each other
c) May intersect or may not intersect
d) None of the above
8. Which property of a system is constant in reversible adiabatic process?
a) Pressure
b) Volume
c) Temperature
d) Entropy
9. Thermodynamics is the study of
a) Energy
b) Equilibrium
c) Entropy
d) None of the above
10. What is the cyclic integral of dQ/T for reversible process?
a) Less than zero
b) Zero
c) More than zero
d) None of the above
11. What is the cyclic integral of dQ/T for irreversible process?
a) Less than zero
b) Zero
c) More than zero
d) None of the above
12. Joule –kelvin effect can be carried out by
a) Throttling process of gas
b) Joule-thomson expansion of gas
c) Both (a) & (b)
d) None of the above
13. Which process does the Rankine cycle contain?
a) Two isothermal and two isochoric processes
b) Two isentropic and two isobaric processes
c) Two isentropic and two isothermal processes
d) Two isothermal and two isobaric processes
14. At ideal condition of vapor power cycle, reversible constant pressure heat rejection is carried out at
a) Boiler
b) Turbine
c) Condenser
d) Feed pump
15. Which ideal process is carried out at the turbine in vapour power cycle?
a) Reversible adiabatic compression
b) Reversible adiabatic expansion
c) Reversible constant pressure heat addition
d) Reversible constant pressure heat rejection
16. The engine which are operating on gas power cycles are
a) Cyclic
b) Non-cyclic
c) Either cyclic or non-cyclic
d) None of the above
17. Internal combustion engine is the example of
a) Cyclic heat engine
b) Non- cyclic heat engine
c) Both (a) & (b)
d) None of the above
18. The cycle which consists of two reversible isotherms and two reversible isochoric is called as
a) Rankine cycle
b) Carnot cycle
c) Stirling cycle
d) Ericsson cycle
19. Two reversible isothermal processes and two reversible isobaric processes are carried out in
a) Rankine cycle
b) Carnot cycle
c) Stirling cycle
d) Ericsson cycle
20. Which thermodynamics cycle for the same condition has highest efficiency among the others?
a) Carnot cycle
b) Stirling cycle
c) Ericsson cycle
d) All of the above have same efficiency
21. What is the correct formula for the net work done of reciprocating engine?
a) Wnet = mean effective pressure X clearance volume
b) Wnet = mean effective pressure X total volume of cylinder
c) Wnet = mean effective pressure X dislacement volume
d) None of the above
22. The ratio of partial pressure of water vapour in a mixture to the saturation pressure of water at the same temperature of the mixture is called as
a) Humidity
b) Partial humidity
c) Specific humidity
d) Relative humidity
23. Which of the following laws is applicable for the behavior of a perfect gas
a) Boyle’s Law
b) Charles’ Law
c) Gay-Lussac Law
d) All of the above
24. An ideal gas as compared to a real gas at very high pressure occupies
a) More volume
b) Less volume
c) Same volume
d) Unpredictable behavior
25. According to Dalton’s law. The total pressure of the mixture of gases is equal to
a) Greater of the partial pressure of all
b) Average of the partial pressure of all
c) Sum of the partial pressure of all
d) Sum of the partial pressure of all/ average molecular weight
26. A closed system is one in which
a) Mass does not cross boundaries of the system though energy may do so
b) Mass crosses the boundary but not the energy
c) Neither mass nor energy cross the boundaries of the system
d) Both energy and mass cross the boundaries of the system
27. Temperature of a gas is produced due to
a) Its heating value
b) Kinetic energy of molecules
c) Repulsion of molecules
d) Attraction of molecules
28. According to kinetic energy theory of gases the absolute zero temperature is attained when
a) Volume of the gas is zero
b) Pressure of the gas is zero
c) Kinetic energy of the molecules is zero
d) Specific heat of gas is zero
29. Kinetic theory of gases assumes that the collisions between the molecules are
a) Perfectly elastic
b) Perfectly inelastic
c) Partly elastic
d) Partly inelastic
30. The pressure of a gas in terms of its mean kinetic energy per unit volume E is equal to
a) E/3
b) E/2
c) 3E/4
d) 2E/3
31. Super heated vapour behaves
a) Exactly as gas
b) As stem
c) As ordinary vapor
d) Approximately as a gas
32. Absolute zero pressure will occur
a) At sea level
b) At the center of earth
c) When molecular momentum of the system become zero
1. The energy of an isolated system is
a) Always decreasing
b) Always constant
c) Always Increasing
d) None of the above
2. The thermodynamics work done by the system on the surrounding is considered as
a) Positive
b) Negative
c) Neutral
d) None of the above
3. When the heat transfer into a system is more than the work transfer out of the system then
a) The internal energy of the system remains constant
b) The internal energy of the system remains decreases
c) The internal energy of the system remains increases
d) None of the above
4. First law of thermodynamics provide
a) A statement that energy balance occurs when a system undergoes a change of state or the process
b) A statement about whether the change of state or the process is at all feasible or not
c) Both (a) & (b)
d) None of the above
5. The thermodynamics cycle in which net heat is transferred to the system and net work is transferred from the system is called as
a) Refrigeration cycle
b) Heat engine cycle
c) Both (a) & (b)
d) None of the above
6. A thermal energy reservoir (TER) has
a) A finite heat capacity
b) An infinite heat capacity
c) A finite mass
d) None of the above
7. Two reversible adiabatic paths
a) Can intersect with each other
b) Cannot intersect with each other
c) May intersect or may not intersect
d) None of the above
8. Which property of a system is constant in reversible adiabatic process?
a) Pressure
b) Volume
c) Temperature
d) Entropy
9. Thermodynamics is the study of
a) Energy
b) Equilibrium
c) Entropy
d) None of the above
10. What is the cyclic integral of dQ/T for reversible process?
a) Less than zero
b) Zero
c) More than zero
d) None of the above
11. What is the cyclic integral of dQ/T for irreversible process?
a) Less than zero
b) Zero
c) More than zero
d) None of the above
12. Joule –kelvin effect can be carried out by
a) Throttling process of gas
b) Joule-thomson expansion of gas
c) Both (a) & (b)
d) None of the above
13. Which process does the Rankine cycle contain?
a) Two isothermal and two isochoric processes
b) Two isentropic and two isobaric processes
c) Two isentropic and two isothermal processes
d) Two isothermal and two isobaric processes
14. At ideal condition of vapor power cycle, reversible constant pressure heat rejection is carried out at
a) Boiler
b) Turbine
c) Condenser
d) Feed pump
15. Which ideal process is carried out at the turbine in vapour power cycle?
a) Reversible adiabatic compression
b) Reversible adiabatic expansion
c) Reversible constant pressure heat addition
d) Reversible constant pressure heat rejection
16. The engine which are operating on gas power cycles are
a) Cyclic
b) Non-cyclic
c) Either cyclic or non-cyclic
d) None of the above
17. Internal combustion engine is the example of
a) Cyclic heat engine
b) Non- cyclic heat engine
c) Both (a) & (b)
d) None of the above
18. The cycle which consists of two reversible isotherms and two reversible isochoric is called as
a) Rankine cycle
b) Carnot cycle
c) Stirling cycle
d) Ericsson cycle
19. Two reversible isothermal processes and two reversible isobaric processes are carried out in
a) Rankine cycle
b) Carnot cycle
c) Stirling cycle
d) Ericsson cycle
20. Which thermodynamics cycle for the same condition has highest efficiency among the others?
a) Carnot cycle
b) Stirling cycle
c) Ericsson cycle
d) All of the above have same efficiency
21. What is the correct formula for the net work done of reciprocating engine?
a) Wnet = mean effective pressure X clearance volume
b) Wnet = mean effective pressure X total volume of cylinder
c) Wnet = mean effective pressure X dislacement volume
d) None of the above
22. The ratio of partial pressure of water vapour in a mixture to the saturation pressure of water at the same temperature of the mixture is called as
a) Humidity
b) Partial humidity
c) Specific humidity
d) Relative humidity
23. Which of the following laws is applicable for the behavior of a perfect gas
a) Boyle’s Law
b) Charles’ Law
c) Gay-Lussac Law
d) All of the above
24. An ideal gas as compared to a real gas at very high pressure occupies
a) More volume
b) Less volume
c) Same volume
d) Unpredictable behavior
25. According to Dalton’s law. The total pressure of the mixture of gases is equal to
a) Greater of the partial pressure of all
b) Average of the partial pressure of all
c) Sum of the partial pressure of all
d) Sum of the partial pressure of all/ average molecular weight
26. A closed system is one in which
a) Mass does not cross boundaries of the system though energy may do so
b) Mass crosses the boundary but not the energy
c) Neither mass nor energy cross the boundaries of the system
d) Both energy and mass cross the boundaries of the system
27. Temperature of a gas is produced due to
a) Its heating value
b) Kinetic energy of molecules
c) Repulsion of molecules
d) Attraction of molecules
28. According to kinetic energy theory of gases the absolute zero temperature is attained when
a) Volume of the gas is zero
b) Pressure of the gas is zero
c) Kinetic energy of the molecules is zero
d) Specific heat of gas is zero
29. Kinetic theory of gases assumes that the collisions between the molecules are
a) Perfectly elastic
b) Perfectly inelastic
c) Partly elastic
d) Partly inelastic
30. The pressure of a gas in terms of its mean kinetic energy per unit volume E is equal to
a) E/3
b) E/2
c) 3E/4
d) 2E/3
31. Super heated vapour behaves
a) Exactly as gas
b) As stem
c) As ordinary vapor
d) Approximately as a gas
32. Absolute zero pressure will occur
a) At sea level
b) At the center of earth
c) When molecular momentum of the system become zero
d) Under vacuum conditions
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mechanical-eng-quiz