CONCEPTS OF THERMODYNAMICS

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

• 0.6 m³/kg , 0.260 m³/mole

• 0.5 m³/kg , 0.0160 m³/mole

• 0.56 m³/kg , 0.0215 m³/mole

• 0.7 m³/kg , 0.0325 m³/mole

A piston/cylinder with a cross-sectional area of 0.01 m² is resting on the stops. With an outside pressure of 100 kPa, what should be the water pressure to lift the piston?

• 178kPa

• 188kPa

• 198kPa

• 208kPa

A large exhaust fan in a lab room keeps the pressure inside at 10 cm water relative vacuum to the hallway? What is the net force acting on the door measuring 1.9 m by 1.1 m?

• 2020 N

• 2030 N

• 2040 N

• 2050 N

A 5 m long vertical tube having cross sectional area 200 cm² is placed in a water. It is filled with 15°C water, with the bottom closed and the top open to 100 kPa atmosphere. How much water is present in tube?

• 99.9 kg

• 109.9 kg

• 89.9 kg

• 79.9 kg

A 5 m long vertical tube having cross sectional area 200 cm² is placed in a water. It is filled with 15°C water, with the bottom closed and the top open to 100 kPa atmosphere. What is the pressure at the bottom of tube ?

• 119 kPa

• 129 kPa

• 139 kPa

• 149 kPa

Find the pressure of water at 200°C and having specific volume of 1.5 m³/kg.

• 0.9578 m³/kg

• 0.8578 m³/kg

• 0.7578 m³/kg

• 0.6578 m³/kg

Find the pressure of water at 200°C and having specific volume of 1.5 m³/kg.

• 141.6 kPa

• 111.6 kPa

• 121.6 kPa

• 161.6 kPa

A 5m³ container is filled with 840 kg of granite (density is 2400 kg/m³) and the rest of the volume is air (density is 1.15 kg/m³). Find the mass of air present in the container.

• 9.3475 kg

• 8.3475 kg

• 6.3475 kg

• 5.3475 kg

A 100 m tall building receives superheated steam at 200 kPa at ground and leaves saturated vapour from the top at 125 kPa by losing 110 kJ/kg of heat. What should be the minimum inlet temperature at the ground of the building so that no steam will condense inside the pipe at steady state?

• 363.54°C

• 263.54°C

• 163.54°C

• none of the mentioned

The pressure gauge on an air tank shows 60 kPa when the diver is 8 m down in the ocean. At what depth will the gauge pressure be zero?

• 34.118 m

• 24.118 m

• 14.118 m

• none of the mentioned