Engineering Thermodynamics
The condition of perfect vacuum, i.e., absolute zero pressure can be attained at

A temperature of 0°C
A temperature of - 273.16°C
A negative pressure and 0°C temperature
A temperature of 273 °K

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Engineering Thermodynamics
Carnot cycle consists of

Two constant volume and two isentropic processes
Two isothermal and two isentropic processes
One constant volume, one constant pressure and two isentropic processes
Two constant pressure and two isentropic processes

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