Gas Properties and Calculations Quiz

Thermodynamic Properties

• The work possess for a helium gas at 20°C is unknown.
• A 1 m3 tank at 200 kPa and 88°C contains an unknown type of gas.

Internal Energy and Enthalpy

• The internal energy of Helium is 200 kJ/kg.
• The enthalpy of Helium is unknown.

Mass of Gases

• The mass of a 2 m3 propane at 280 kPa and 40°C is unknown.
• The mass of carbon dioxide having a pressure of 20 psia at 200°F with 10 ft3 volume is unknown.

Ventilation and Flow Rate

• The air flow in ft3/min of mechanical ventilation required to exhaust an accumulation of refrigerant due to leaks of the system for a mass of 4 lbs refrigerant is unknown.
• The free aperture cross section in m3 for the ventilation of a machinery room if the mass of refrigerant is 9 kg is unknown.

Pipe Flow

• The hydraulic gradient of a 1 mile, 17 inches inside diameter pipe when 3300 gal/min of water flow with f = 0.03 is unknown.
• The loss of head in the pipe entrance if speed of flow is 10 m/s is unknown.

Drying

• Wet material, containing 220% moisture (dry basis), is to be dried at a rate of 1.5 kg/s in a continuous dryer to give a product containing 10% (dry basis).
• Moisture removed in kg/hr is unknown.
• Copra enters a dryer containing 70% moisture and leaves 7% moisture.
• Moisture removed on each pound of solid in the final product is unknown.

Forces and Pressures

• A 1 m x 1.5 m cylindrical tank is full of oil with SG = 0.92.
• The force acting at the bottom of the tank in dynes is unknown.
• Pressure at the 100-fathom depth of water in kPa is unknown.

Mass and Volume

• The mass of 10 quartz of water is unknown.
• The mass of carbon dioxide having a pressure of 20 psia at 200°F with 10 ft3 volume is unknown.

Heat and Enthalpy

• The heat needed to raise the temperature of water from 30°C to 100°C with 60% quality is unknown.
• The enthalpy of water at 212°F and 14.7 psi if the dryness factor is 30% is unknown.