Engineering Thermodynamics
A diathermic wall is one which

Permits thermal interaction
Discourages thermal interaction
Prevents thermal interaction
Encourages thermal interaction

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Engineering Thermodynamics
Which of the following statement is correct according to Clausis statement of second law of thermodynamics?

None of these
It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.
It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle.
It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature.

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Engineering Thermodynamics
According to Avogadro's law, for a given pressure and temperature, each molecule of a gas

Occupies volume inversely proportional to its specific weight
Occupies volume inversely proportional to its molecular weight
Occupies same volume
Occupies volume proportional to its specific weight

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Engineering Thermodynamics
The efficiency of a gas turbine is given by

(Net work output)/(Work-done by the turbine)
(Actual temperature drop)/(Isentropic temperature drop)
(Isentropic increase in temperature)/(Actual increase in temperature)
(Net work output)/(Heat supplied)

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