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determine the force P required to maintain the 200 kg engine in the position for which theta = 30 degree. The diameter of the pulley at B is negligible.
A 24.72 meter distance will be laid out using a 50 m tape that is .12 m too long. Where on the tape would you put the mark in order to layout the required 24.72 meter?
A refrigerator operates on the reversed Carnot cycle and uses water as the working
fluid. At the beginning of the isothermal expansion, the steam has an absolute
pressure of 1kPa and a quality of 7%; at the end of the isothermal expansion, the
steam is dry and saturated. At the end of heat rejection process the water is saturated
liquid. Firstly: Sketch the T‐s and P‐v diagrams for the cycle, and secondly: for one kg
of water, calculate: a) The steam pressure at beginning of the heat rejection process,
b) the net work per cycle, c) the COP of the cycle in two conditions: 1‐refrigeration
and 2‐heat pump
21.What are the different concentration scales to measure air pollutants in the atmosphere?
20. What is nutrient cycles, explain briefly?
19. What are the advantages of open dumping disposal process?
18.What are the advantages of the bag filter?
17.The environmental lapse rate is 10°C/ 1000 meter, if the ground temperature is 50°C. What will be the temperature (°C) at 500 meter elevation?
a) 40 b) 45 c) 50
d) 55
