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Application: Design of radomes. A radome is placed in front of a radar antenna to protect the antenna from the elements. Material properties of the radome are known and the radome is a perfect dielectric. Calculate the minimum thickness of the radome so that the radome is transparent for waves propagating from the antenna and to the antenna. The radome properties are: μ1 = μ0, ε1, σ1= 0, f = 1 GHz. Use properties of free space for air.
assuming that r-134a is an ideal gas what would the specific volume of r-134a at 40 deg c and 0.06 mpaabsolute? how
refrigerant-134a enters the evaporator coils placed at the back of the freezer section of a household refrigerator at
determine the minimum time needed for the plate temperature to reach 140°C.
A 1.5in diameter rod 20ft long elongates .48in under a load of 53 kips. the diameter of the rod increases .001in during loading. Determine the poisons ratio, modulus of elasticity, and shear modulus
a regenerative steam cycle operates between the limits of 80 bar 540oc and 0.05 bar. if only one extraction from the
Two control rods are attached at A to lever AB. Using trigonometry and knowing that force in the right-hand rod is F2=20 lb, determine a.) the required force F1 in the left-hand rod if the resultant R of the forces exerted by the rods on the le..
1) Explain the term reversibility. 2) Write the two property equations involving entropy. 3) What is meant by compressibility factor? 4) What is meant by partial molar property?
Nitrogen gas at 65kPa and 7C enters an adiabatic diffuser steadily with a velocity of 210 m/s and leaves at 119kPa and 22C. Determine the exit velocity of the nitrogen. the ratio of the inlet to exit area
a hydraulic cylinder has a piston of cross sectional area 45cm2 and a constant working fluid pressure of 2.2mpa. the
Choose the beam dimension a to reduce the deflection to below 1cm whilst minimising the mass of the beam.
What is the net rate of radiation exchange between the spheres - What is the net rate of radiation exchange between the surfaces if they are diffuse and gray.
1-listening is often the most important aspect of good communication. why is this factor often ignored? what can
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