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Questions and Answers
The change in total energy of a system during a process is the sum of the changes in its internal, kinetic, and potential energies.
The change in total energy of a system during a process is the sum of the changes in its internal, kinetic, and potential energies.
True (A)
The total energy change of a system can be expressed as: $ riangle E_{sys} = riangle U + riangle K + riangle P$
The total energy change of a system can be expressed as: $ riangle E_{sys} = riangle U + riangle K + riangle P$
True (A)
Specific internal energies u1 and u2 can be determined directly from the property steam tables for gases.
Specific internal energies u1 and u2 can be determined directly from the property steam tables for gases.
False (B)
Energy interactions in a system are recognized at the system boundary as they cross it.
Energy interactions in a system are recognized at the system boundary as they cross it.
Heat transfer to a system (heat gain) decreases the internal energy of the system.
Heat transfer to a system (heat gain) decreases the internal energy of the system.
Energy can be transferred to or from a system in two forms: heat and work.
Energy can be transferred to or from a system in two forms: heat and work.
In a closed system, the only forms of energy interactions are heat transfer (Q) and mass transfer (M).
In a closed system, the only forms of energy interactions are heat transfer (Q) and mass transfer (M).
The energy balance equation in the rate form can be represented as E = E_t - E_o + E_m, where E_t and E_o represent total energies entering and leaving the system respectively.
The energy balance equation in the rate form can be represented as E = E_t - E_o + E_m, where E_t and E_o represent total energies entering and leaving the system respectively.
The 1st law of thermodynamics for closed systems includes consideration of both heat transfer (Q) and work (W).
The 1st law of thermodynamics for closed systems includes consideration of both heat transfer (Q) and work (W).
A control volume is a fixed mass or closed system where energy balance equations are applied.
A control volume is a fixed mass or closed system where energy balance equations are applied.
The general form of the energy balance (1st law of thermodynamics) for any system undergoing a process does not include changes in potential energy (βP).
The general form of the energy balance (1st law of thermodynamics) for any system undergoing a process does not include changes in potential energy (βP).
Energy balance equation on a per unit mass basis is expressed as e = E_m + W_o - W_i, where W_o and W_i represent work done by the system and work done on the system respectively.
Energy balance equation on a per unit mass basis is expressed as e = E_m + W_o - W_i, where W_o and W_i represent work done by the system and work done on the system respectively.
In a control volume or open system, the three forms of energy interactions are heat transfer (Q), work (W), and energy transport with mass (Emass).
In a control volume or open system, the three forms of energy interactions are heat transfer (Q), work (W), and energy transport with mass (Emass).
The total energy of a flowing fluid of mass m is determined by the formula: Amount of energy transport: $Emass.V^2 + gz = m h + 2E_m_V^2 + gz = m h + 2$.
The total energy of a flowing fluid of mass m is determined by the formula: Amount of energy transport: $Emass.V^2 + gz = m h + 2E_m_V^2 + gz = m h + 2$.
When a fluid stream with uniform properties is flowing at a mass flow rate of m, the rate of energy flow with that stream can be calculated using the formula: Rate of energy transport: kJ kW.
When a fluid stream with uniform properties is flowing at a mass flow rate of m, the rate of energy flow with that stream can be calculated using the formula: Rate of energy transport: kJ kW.
The specific enthalpy of fluid (h) in thermodynamics is measured in kJ/kg.
The specific enthalpy of fluid (h) in thermodynamics is measured in kJ/kg.
The general form of the 1st law of thermodynamics for open systems undergoing any kind of process includes terms related to heat transfer, work, and change in energy.
The general form of the 1st law of thermodynamics for open systems undergoing any kind of process includes terms related to heat transfer, work, and change in energy.
In closed systems, the energy interactions are limited to only heat transfer (Q) and work (W), without considering energy transport with mass (Emass).
In closed systems, the energy interactions are limited to only heat transfer (Q) and work (W), without considering energy transport with mass (Emass).
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