Basic Thermodynamics III Lowersixth Science Physics

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Test your knowledge on heat engines and entropy.

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YAKILI LMS

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Basic Thermodynamics III Lowersixth Science Physics


Basic Thermodynamics III Lowersixth Science PhysicsOnline version Test your knowledge on heat engines and entropy. by YAKILI LMS 1 In Carnot's theorem, all reversible engines operating between the same two temperatures have the same efficiency. Yes No 2 The second law says heat flows from cold to hot spontaneously. Yes No 3 The coefficient of performance depends on the temperatures of reservoirs. Yes No 4 Entropy increase is associated with greater disorder. Yes No 5 W = Qh - Qc for a heat engine. Yes No 6 The efficiency of a heat engine can be boosted by adding more friction. Yes No 7 An ideal gas in a Carnot cycle adheres to the ideal gas law PV = nRT. Yes No 8 The first law forbids creation of energy. Yes No 9 Entropy decreases in natural spontaneous processes. Yes No 10 Carnot efficiency is 1 minus Tc/Th. Yes No 11 The total energy is conserved in a cyclic heat engine (first law). Yes No 12 An isochoric process involves heat transfer without work. Yes No 13 A heat pump delivers work without any heat transfer. Yes No 14 The environmental crisis is best understood without reference to thermodynamics. Yes No 15 A reversible engine has zero work output. Yes No 16 In a heat engine, Qh equals Qc. Yes No 17 The entropy of the universe decreases in spontaneous processes. Yes No 18 If Th increases with Tc fixed, Carnot efficiency increases. Yes No 19 W = Qc - Qh for a heat engine. Yes No 20 Heat engines require a hot reservoir and a cold reservoir. Yes No 21 COP for cooling is Th/(Th-Tc). Yes No 22 The second law allows perpetual motion machines of the second kind. Yes No 23 A heat engine can convert all the heat input into work in practice. Yes No 24 A Carnot engine is the most efficient possible heat engine between two temperatures. Yes No 25 A reversible cycle has ΔS_total = 0. Yes No 26 The unit of entropy is joules per kelvin. Yes No 27 For a reversible isothermal process, ΔS = Qrev/T. Yes No 28 Entropy is not related to disorder in any way. Yes No 29 The second law states that no process is 100% efficient in converting heat to work. Yes No 30 COP for heating in a heat pump is Th/(Th-Tc). Yes No 31 Real engines have efficiencies lower than Carnot due to irreversibilities. Yes No 32 The second law implies that entropy of the universe tends to increase. Yes No 33 COP for heating is Tc/(Th-Tc). Yes No 34 Entropy can remain constant in a reversible process. Yes No 35 The working substance in a heat engine undergoes a cyclic process. Yes No 36 All processes in nature are reversible. Yes No 37 The environmental crisis can be described as an entropy crisis at large scales. Yes No 38 Carnot engines are more efficient than any real engine under all conditions. Yes No 39 Carnot's theorem applies to any energy conversion device including electrical generators. Yes No 40 The efficiency of a Carnot engine depends only on the hot and cold reservoir temperatures. Yes No 41 The entropy of an ideal gas is independent of its state variables. Yes No 42 An ideal regenerative engine would not beat Carnot efficiency between the same two temperatures. Yes No 43 Entropy is a measure of temperature itself. Yes No 44 The environmental crisis has nothing to do with entropy principles. Yes No 45 The Carnot efficiency can exceed 1 when Th is very high. Yes No 46 COP for heating is undefined if Th equals Tc. Yes No 47 The entropy of an isolated system never decreases. Yes No 48 COP for cooling is Tc/(Th-Tc). Yes No 49 A Carnot engine's efficiency equals 1 minus the ratio of the cold reservoir temperature to the hot reservoir temperature (η = 1 - Tc/Th). Yes No 50 The coefficient of performance (COP) for a refrigerator is always less than 1. Yes No

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Basic Thermodynamics III Lowersixth Science PhysicsOnline version

by YAKILI LMS

In Carnot's theorem, all reversible engines operating between the same two temperatures have the same efficiency.

The second law says heat flows from cold to hot spontaneously.

The coefficient of performance depends on the temperatures of reservoirs.

Entropy increase is associated with greater disorder.

W = Qh - Qc for a heat engine.

The efficiency of a heat engine can be boosted by adding more friction.

An ideal gas in a Carnot cycle adheres to the ideal gas law PV = nRT.

The first law forbids creation of energy.

Entropy decreases in natural spontaneous processes.

Carnot efficiency is 1 minus Tc/Th.

The total energy is conserved in a cyclic heat engine (first law).

An isochoric process involves heat transfer without work.

A heat pump delivers work without any heat transfer.

The environmental crisis is best understood without reference to thermodynamics.

A reversible engine has zero work output.

In a heat engine, Qh equals Qc.

The entropy of the universe decreases in spontaneous processes.

If Th increases with Tc fixed, Carnot efficiency increases.

W = Qc - Qh for a heat engine.

Heat engines require a hot reservoir and a cold reservoir.

COP for cooling is Th/(Th-Tc).

The second law allows perpetual motion machines of the second kind.

A heat engine can convert all the heat input into work in practice.

A Carnot engine is the most efficient possible heat engine between two temperatures.

A reversible cycle has ΔS_total = 0.

The unit of entropy is joules per kelvin.

For a reversible isothermal process, ΔS = Qrev/T.

Entropy is not related to disorder in any way.

The second law states that no process is 100% efficient in converting heat to work.

COP for heating in a heat pump is Th/(Th-Tc).

Real engines have efficiencies lower than Carnot due to irreversibilities.

The second law implies that entropy of the universe tends to increase.

COP for heating is Tc/(Th-Tc).

Entropy can remain constant in a reversible process.

The working substance in a heat engine undergoes a cyclic process.

All processes in nature are reversible.

The environmental crisis can be described as an entropy crisis at large scales.

Carnot engines are more efficient than any real engine under all conditions.

Carnot's theorem applies to any energy conversion device including electrical generators.

The efficiency of a Carnot engine depends only on the hot and cold reservoir temperatures.

The entropy of an ideal gas is independent of its state variables.

An ideal regenerative engine would not beat Carnot efficiency between the same two temperatures.

Entropy is a measure of temperature itself.

The environmental crisis has nothing to do with entropy principles.

The Carnot efficiency can exceed 1 when Th is very high.

COP for heating is undefined if Th equals Tc.

The entropy of an isolated system never decreases.

COP for cooling is Tc/(Th-Tc).

A Carnot engine's efficiency equals 1 minus the ratio of the cold reservoir temperature to the hot reservoir temperature (η = 1 - Tc/Th).

The coefficient of performance (COP) for a refrigerator is always less than 1.