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# (Solved): QUESTION 3 a) How would you know that iron (150\deg C) and copper bars (20\deg C) which are brought ...

QUESTION 3 a) How would you know that iron

`(150\deg C)`

and copper bars

`(20\deg C)`

which are brought into contact in isolated enclosure follows Zeroth Law of Thermodynamics? (2 marks) b) A rigid tank contains

`10kg`

of air at

`200kPa`

and

`27\deg C`

. The air is heated until its pressure is twice the initial value (assume ideal gas behavior). Determine: i) The volume of the tank. (2 marks) ii) The amount of heat transfer. (6 marks) c) Air flows steadily through an adiabatic turbine, entering at

`1MPa`

, (at temperature

`500\deg C`

and speed of

`120(m)/(s)`

) and leaving at

`150kPa`

, (at temperature

`150\deg C`

and speed of 250

`(m)/(s)`

). The inlet area of turbine is

`80cm^(2)`

. Determine: i) The mass flow rate of the air. ii) The power output of the turbine.

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