WorksheetsThermodynamics QUIZZ 1
Total questions: 31
Worksheet time: 31mins
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A thermodynamic system is defined as
The physical space outside the system boundary
Only a closed container with gas.
A fixed quantity of matter or a region in space chosen for analysis
The total universe including surroundings.
The boundary of a thermodynamic system
Can be real or imaginary, fixed or movable.
Must always be rigid.
Separates two solid bodies only.
Has no physical significance.
An open system differs from a closed system because it:
Allows both mass and energy to cross its boundaries.
Allows only energy transfer.
Has constant volume always.
Is an isolated system.
An isolated system is one where
Only heat can enter or leave.
Only work crosses the boundary.
Neither mass nor energy crosses the system boundary.
The pressure remains constant.
Which of the following is an intensive property
Volume
Temperature
Mass
Internal energy
The First Law of Thermodynamics is essentially a statement of:
Conservation of mass.
Degradation of energy.
Conservation of energy.
Entropy increase.
The kinetic energy of a system depends on:
Temperature only.
Mass and velocity of the system.
Volume of the system.
Potential energy.
In thermodynamics, work transfer occurs when:
Energy crosses the boundary due to a force acting through a distance.
Energy transfer is due to temperature difference.
There is no motion of boundary.
The process is adiabatic.
The internal energy of a system depends on
The molecular structure and temperature of the substance.
The system’s position in a gravitational field.
The volume of the surroundings.
The flow rate of mass.
For an ideal gas, the internal energy is a function of:
Pressure and volume
Temperature only.
Specific heat ratio.
Density only.
A turbine is best classified as:
A closed system
An isolated system
An open system
A steady closed process
For an open system under steady-state conditions
The system’s energy continuously increases.
The mass flow rate into the system equals the mass flow rate out.
No work is done.
The internal energy is constant everywhere.
The first law of thermodynamics is a statement of:
Conservation of energy
Conservation of mass
Entropy change
Irreversibility
For a closed system, the first law can be expressed as
Q=W
ΔU=Q−W
ΔU=W−Q
Q+W=0
A steady-flow process means:
Properties change with time
Mass flow rate remains constant
Energy accumulation occurs
No energy transfer takes place
The first law cannot determine:
The amount of energy transferred
The direction of a process
The quantity of work
The heat added to a system
The Kelvin–Planck statement implies that
100% efficient heat engines are impossible
Heat cannot flow from cold to hot
Energy can be destroyed
Work can be fully converted into heat
The Clausius statement implies that:
Heat can flow from hot to cold spontaneously
Heat can flow from cold to hot without work
Energy cannot be conserved
Work can be created from nothing
Entropy is a measure of
System pressure
Energy transfer
Disorder or randomness
Temperature difference
According to the Clausius inequality:
∮dQ/T=0 for all cycles
∮dQ/T≤0
∮dQ/T≥0
∮dQ/T=W
Which of the following setups would violate the Kelvin–Planck statement?
A heat engine rejecting heat to a cold reservoir
A device converting all absorbed heat into work in a cycle
A heat pump requiring input work to transfer heat
A Carnot engine operating between two reservoirs
A refrigerator transferring heat from a low-temperature space to a high-temperature reservoir without work input would violate:
First law of thermodynamics
Clausius statement
Kelvin–Planck statement
Conservation of mass
If a device could transfer heat from a cold to a hot reservoir without work, what would happen according to the Kelvin–Planck statement?
A new heat engine could be built with 100% efficiency
Heat flow between reservoirs would stop
Energy conservation would be violated
Entropy would decrease for all processes
Which of the following conditions is not true for a reversible process?
It can be reversed without leaving any change in the system or surroundings
It occurs infinitely slowly
It has maximum work output or minimum work input
It involves finite temperature difference during heat transfer
A Carnot engine operates between 600 K and 300 K. If the heat absorbed from the hot reservoir is 1000 kJ, the work output is:
250 kJ
400 kJ
500 kJ
600 kJ
The loss of availability in a process is directly proportional to:
The total work output
The change in internal energy
The entropy generation multiplied by ambient temperature
The enthalpy change of the system
he first law of thermodynamics ensures energy conservation but cannot explain why:
The efficiency of a heat engine is less than 100%
Energy can exist in different forms
Energy is transferred between system and surroundings
Work and heat are path functions
The ocean can be considered a thermal reservoir because:
It contains large quantities of heat
Its temperature remains nearly constant despite heat exchange
It is always at thermal equilibrium
It has a uniform composition
In a process at 25 °C (298 K), if entropy generation is 0.02 kJ/K, the loss of available work is:
2.98 kJ
5.96 kJ
0.596 kJ
0.149 kJ
Which of the following factors makes a process irreversible?
Friction
Quasi-equilibrium conditions
Infinitesimal temperature difference during heat transfer
Reversible work interactions
