QUIZ 3

A property which does not depend on the mass of the substance such as temperature, pressure, density, stress and velocity.

• Intensive Property

• Extensive Property

• Ideal Property

• Phase

An ideal gas at 45 psig and 80°F is heated ain a closed container to 130°F. What is the final pressure?

• 54 psia

• 75 psia

• 65 psia

• 43 psia

It is defined as a phase of a substance that is not about to vaporize.

• Superheated Vapor

• Compressed Liquid

• Saturated Mixture

• Saturated Liquid

Assuming compression is according to the law PV = constant. Calculate the initial volume of gas at a pressure of 2 bar which will occupy a volume of 6 cubic meters when it is compressed to a pressure of 42 bar?

• 126 cu. meters

• 130 cu. meters

• 120 cu. meters

• 136 cu. meters

In a constant temperature closed system process, 100 BTU of heat is transferred to the working fluid at 100°F. What is the change in entropy of the working fluid?

• 0.18 kJ/K

• 0.25 kJ/K

• 0.34 kJ/K

• 0.57 kJ/K

Given a steam pressure of 900 lb/ft^2, the temperature of 300°F, specific volume of 5.8 ft^3/lb. If the specific enthalpy is 9500 ft-lb/lb, what is the internal energy of the system?

• 4400 ft-lb/lb

• 3600 ft-lb/lb

• 3920 ft-lb/lb

• 4280 ft-lb/lb

At what temperature readings do the Fahrenheit and Celsius scales have the same value?

• -35 degrees

• -45 degrees

• -40 degrees

• -30 degrees

There are 20 kg of flue gases formed per kg of fuel oil burned in the combustion of a fuel oil C12H26. What is the excess air in percent?

• 20.17%

• 26.67%

• 15.56%

• 8.21%

If methane (CH4) is completely burned, find the percent nitrogen in the products.

• 71.5%

• 76.5%

• 3.76%

• 54.3%

Calculate the heating value of coal having the following composition by weight using Dulong’s formula. C = 75%, H = 5%, O = 6%, N = 1.5%, S = 3%, Water = 1.5%, Ash = 8%.

• 150,450 Btu/lb

• 12,640 Btu/lb

• 13,360 Btu/lb

• 14,580 Btu/lb