Mechanical Engineering Quiz

Steam enters a throttling calorimeter at a pressure of 1.03 MPA. The calorimeter downstream pressure and temperature are 0.1 MPA and 125 . °C What is the percent moisture of the steam supplied? Use the steam properties in kJ/kg: At 1.03 MPA hfg = 2010.7,hg = 2779.25 at 0.1 MPA and 125 ,°Ch=2726.6

The drinking water in a food store in Cebu is made by cooling a tap water in a refrigerated water fountain from 22 to 8 at a flow rate of °C°C 8 kg/hr. If the COP of this refrigerator is 3.1, what is the required power input to this refrigerator?

The heat capacity of an object is:

The work done in a turbine is _____ since it is done by the fluid.

A fuel has the following volumetric analysis: CH_4 = 68%, C_2 H_6 = 32％ Assume complete combustion with 15％ excess air at 101.325 KPA, 21°C wet bulb and 27°C dry bulb. What is the partial pressure of water vapor in kpa?

What is the specific gravity of an oil which has a Baume reading of 28°?

The unit of radioactivity is...

Which of the following valves is the one designed to allow a fluid to pass through in one direction?

The second law of thermodynamics says that whenever energy is exchanged or converted from one form to another, the potential for energy to do work will be _____.

A steam generator on a test generates 885, 000 lb of steam in a 4-hr period. The average steam pressure is 400 psia, the average steam temperature is 700°F, and the average temperature of the feedwater supplied to the boiler is 280°F. If the boiler efficiency for the period is 82.5％ and the coal has a heating value of 13, 850 BTU/lb in actual firing, find the average amount of coal burned in short tons per hour.