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Under which ideal condition, the efficie...

Under which ideal condition, the efficiency of a carnot engine become 100% ?

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If the temperature of sink will be `0^@` K, then its efficiency can be 100%.
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Why is a heat engine never 100% efficient ?

The efficiency of a heat engine is defined as the ratio of the mechanical work done by the engine in one cycle to the heat absorbed from the high temperature source . eta = (W)/(Q_(1)) = (Q_(1) - Q_(2))/(Q_(1)) Cornot devised an ideal engine which is based on a reversible cycle of four operations in succession: isothermal expansion , adiabatic expansion. isothermal compression and adiabatic compression. For carnot cycle (Q_(1))/(T_(1)) = (Q_(2))/(T_(2)) . Thus eta = (Q_(1) - Q_(2))/(Q_(1)) = (T_(1) - T_(2))/(T_(1)) According to carnot theorem "No irreversible engine can have efficiency greater than carnot reversible engine working between same hot and cold reservoirs". Efficiency of a carnot's cycle change from (1)/(6) to (1)/(3) when source temperature is raised by 100K . The temperature of the sink is-

The efficiency of a heat engine is defined as the ratio of the mechanical work done by the engine in one cycle to the heat absorbed from the high temperature source . eta = (W)/(Q_(1)) = (Q_(1) - Q_(2))/(Q_(1)) Cornot devised an ideal engine which is based on a reversible cycle of four operations in succession: isothermal expansion , adiabatic expansion. isothermal compression and adiabatic compression. For carnot cycle (Q_(1))/(T_(1)) = (Q_(2))/(T_(2)) . Thus eta = (Q_(1) - Q_(2))/(Q_(1)) = (T_(1) - T_(2))/(T_(1)) According to carnot theorem "No irreversible engine can have efficiency greater than carnot reversible engine working between same hot and cold reservoirs". An inventor claims to have developed an engine working between 600K and 300K capable of having an efficiency of 52% , then -

The efficiency of a heat engine is defined as the ratio of the mechanical work done by the engine in one cycle to the heat absorbed from the high temperature source . eta = (W)/(Q_(1)) = (Q_(1) - Q_(2))/(Q_(1)) Cornot devised an ideal engine which is based on a reversible cycle of four operations in succession: isothermal expansion , adiabatic expansion. isothermal compression and adiabatic compression. For carnot cycle (Q_(1))/(T_(1)) = (Q_(2))/(T_(2)) . Thus eta = (Q_(1) - Q_(2))/(Q_(1)) = (T_(1) - T_(2))/(T_(1)) According to carnot theorem "No irreversible engine can have efficiency greater than carnot reversible engine working between same hot and cold reservoirs". A carnot engine whose low temperature reservoir is at 7^(@)C has an efficiency of 50% . It is desired to increase the efficiency to 70% . By how many degrees should the temperature of the high temperature reservoir be increased?

KUMAR PRAKASHAN-THERMODYANMICS -Section-C (Objective Questions (VSQs))
  1. Give the nature of Pto V điagrams of isobaric and isochoric processes.

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  2. Write two essential characteristics of an ideal heat engine.

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  3. Under which ideal condition, the efficiency of a carnot engine become ...

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  4. In summer, when the valve of a bicycle tube is removed the escaping ai...

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  5. When air of the atmosphere rises up it cools. Why ?

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  6. Why does a gas get heated on compression ?

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  7. Can two isothermal curves intersect each other?

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  8. Is the rusting of iron be a reversible process ? Why ?

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  9. For all gases CP - CV constant, then all gases CP/CV hold constant ?

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  10. Which quantity remains constant in an adiabatic process ?

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  11. Is the specific heat of water and ice be the same? Give their values.

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  12. What is the total work done in a cyclic process ?

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  13. With what the internal energy of real gases be determined ?

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  14. Melting of ice is an adiabatic or an isothermal process ?

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  15. Can PV = RT be described with an isothermal or an adiabatic process ?

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  16. Give the main points of second law of thermodynamics.

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  17. What is the significance of the heat capacity ratio CP/CV for a gas ?

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  18. You feel enjoy by having bath in shower in summer but not in winter. W...

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  19. Write difference between CP-CV=R, CP-CV=R/J

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  20. Is the specific heat of water is greater than that of sand ?

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