Heat and Work Transfer Concepts
1 / 10
In a free expansion process:
 Explanation: Free expansion into a vacuum has no heat (insulated) or work (no resistance). For ideal gases, internal energy stays constant as temperature doesn’t change.
2 / 10
Work transfer is significant in:
 Explanation: Open systems like turbines produce work via mass flow and boundary motion. Isolated or boundary-less systems don’t facilitate work; entropy defines isentropic processes.
3 / 10
Heat transfer is most critical in which device?
 Explanation: Heat exchangers transfer heat between fluids, like steam to water in power plants. Compressors, turbines, and pistons prioritize work over heat transfer.
4 / 10
The First Law of Thermodynamics involves:
 Explanation: The First Law states internal energy increases with heat added, decreases with work done. Other options misrepresent this energy balance for closed systems.
5 / 10
Positive work transfer indicates:
 Explanation: Positive work occurs when the system expands, pushing its surroundings. Negative work or heat transfers are distinct, per GATE’s sign convention.
6 / 10
Pressure-volume work is zero in:
 Explanation: No volume change in a rigid container means no pressure-volume work. Other processes like isobaric or isothermal involve work if volume changes.
7 / 10
In an adiabatic process:
 Explanation: Adiabatic processes have no heat transfer due to insulation or speed. Work or internal energy changes can still occur, unlike in isothermal or zero-temperature cases.
8 / 10
Heat is a:
Explanation: Heat depends on the process path, varying in constant-pressure vs. constant-volume heating. Unlike state functions (e.g., internal energy), it’s not fixed by system state.
9 / 10
Work transfer in thermodynamics is primarily associated with:
 Explanation: Work involves boundary movement, like a gas pushing a piston during expansion. Molecular energy, heat, or temperature changes are distinct from mechanical work transfer.
10 / 10
Heat transfer occurs due to:
Explanation: Heat flows from higher to lower temperature, like a hot mug warming cold air. Pressure, volume, or entropy changes relate to work or process outcomes, not heat’s cause.
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