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A Carnot engine whose efficiency is $40 %,$ receives heat at $500 K$ . If the efficiency is to be $50 %$ , the source temperature for the same exhaust temperature is

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Important Questions on The First Law of Thermodynamics

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 15 - The First Law of Thermodynamics>Objective Problems>Q 18

100 g

of water is heated from

30 ° C

50 ° C

. Ignoring the slight expansion of the water, the change in its internal energy is (Specific heat of water is

4184 J {kg}^{- 1} K^{- 1}

)

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 15 - The First Law of Thermodynamics>Objective Problems>Q 19

The thermodynamic process in which no work is done on or by the gas is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 15 - The First Law of Thermodynamics>Objective Problems>Q 20

Two soap bubbles of radii

x

and

y

coalesce to constitute bubble of radius

z

. Then,

z

is equal to

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 15 - The First Law of Thermodynamics>Objective Problems>Q 22

A diatomic ideal gas is compressed adiabatically to

\frac{1}{32}

of its initial volume. If the initial temperature of the gas is

T_{i}

(in kelvin) and the final temperature is

T_{f} = a T_{i}

, then value of

a

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 15 - The First Law of Thermodynamics>Objective Problems>Q 23

A diatomic ideal gas is used in a car engine as the working substance. If during the adiabatic expansion part of the cycle, volume of the gas increases from

V

32 V

. The efficiency of the engine is

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 15 - The First Law of Thermodynamics>Objective Problems>Q 24

The efficiency of a Carnot engine working between

800 K

and

500 K

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 15 - The First Law of Thermodynamics>Objective Problems>Q 25

The efficiency of Carnot heat engine is

0.5

, when the temperature of the source is

T_{1}

and that of sink is

T_{2}

. The efficiency of another Carnot heat engine is also

0.5

. The temperatures of source and sink of the second engine respectively are

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Complete Study Pack for Engineering Entrances Objective Physics Vol 1>Chapter 15 - The First Law of Thermodynamics>Excercise 2>Q 1

A Carnot engine having an efficiency of

\frac{1}{10}

is being used as a refrigerator. If the work done on the refrigerator is

10 J

, then the amount of heat absorbed from the reservoir at lower temperature is,

A Carnot engine whose efficiency is 40%, receives heat at 500 K. If the efficiency is to be 50%, the source temperature for the same exhaust temperature is

Important Questions on The First Law of Thermodynamics

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A Carnot engine whose efficiency is $40 %,$ receives heat at $500 K$ . If the efficiency is to be $50 %$ , the source temperature for the same exhaust temperature is