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In practise, all heat engines have effic...

In practise, all heat engines have efficiency less than that of a carnot engine because

A

Carnot engine is irreversible

B

A reversible process can never be attained in a real world

C

Irreversible engine has higher efficiency than reversible engine

D

Efficiency of carnot engine is always one

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The correct Answer is:
B
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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-

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AAKASH INSTITUTE ENGLISH-THERMODYNAMICS-Assignment (Section-A) Objective Type Questions (one option is correct)
  1. The value of eta may lie between

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  2. If a carnot engine works between 127^(@)C and 527^(@)C then its effici...

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  3. If the temperature of sink is at absolute zero, then the efficiency of...

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  4. A carnot engine has efficiency of 50% when its sink is at 227^(@)C. Wh...

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  5. In a carnot engine, when heat is absorbed from the source, its tempera...

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  6. A carnot engine whose sink is at 300 K has an efficiency of 50. by how...

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  7. Choose the correct relation

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  8. A carnot engine takes 6000 cal of heat from a reservoir at 627^(@)C an...

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  9. A process can be reversible if

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  10. Adiabatic expansion of a gas causes

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  11. The internal energy of non-ideal gas depends on

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  12. In practise, all heat engines have efficiency less than that of a carn...

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  13. The effiency of reversible engine isthe irreversible engine.

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  14. A carnot cycle consists of

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  15. The internal energy of an ideal gas increases when it

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  16. Find the change in internal energy if heat supplied to the gaseous sys...

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  17. Specific heat capacity of water is

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  18. The value of C(V) for monatomic gas is (3)/(2)R, then C(P) will be

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  19. Adiabatic exponent of a gas is equal to

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  20. A carnot engine is working in such a temperature of sink that its effi...

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