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Thermodynamics Mcqs

Q:

A piston/cylinder with a cross-sectional area of 0.01 m^2 is resting on the stops. With an outside pressure of 100 kPa, what should be the water pressure to lift the piston?

A) 178kPa B) 188kPa
C) 198kPa D) 208kPa
 
Answer & Explanation Answer: C) 198kPa

Explanation: Pw = Po + mg/A = 100000 + (100*9.8/0.01) = 198kPa.

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Q:

One kg of diatomic Oxygen is present in a 500 L tank. Find the specific volume on both mass and mole basis.

A) 0.6 m³/kg , 0.260 m³/mole B) 0.5 m³/kg , 0.0160 m³/mole
C) 0.56 m³/kg , 0.0215 m³/mole D) 0.7 m³/kg , 0.0325 m³/mole
 
Answer & Explanation Answer: B) 0.5 m³/kg , 0.0160 m³/mole

Explanation: The specific volume on mass basis = 0.5/1 = 0.5 m³/kg
specific volume on mole basis= 0.5/(1/0.032) = 0.0160 m³/mole.

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