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Application: Receive-transmit system. To evaluate the properties of an antenna, two identical antennas are used in a receive-transmit system. The two antennas are placed a distance d = 10 km apart and or1e antenna transmits 10 W at 300 MHz. The second antenna receives 10 µ,W.
The two antennas are adjusted so that the direction of maximum directivity coincides with the line connecting them. Calculate:
(c) The maximum directivity of the antenna.
(d) The maximum effective area of the antenna.
the number of vacancies present in some metal at 857degc is 1.7 x 1024 m-3. calculate the number of vacancies at
The nominal breaking strength of the rope is 10,000 lbs. Calculate how much payload this assembly can allowably pick up. Show your work.
an instrument having a resonance frequency of 1414 rads with a damping ratio of 0.5 is used to measure a signal of 6000
the rigid tank in the figure below has a volume of 60 l and initially contains a two-phase liquid vapor mixture of h20
during a constant pressure process 10 kg of refrigerant 134a at 4degrees c and 10 bars expand to a volume of 0.1 m3.a
an iron ball is thrown into the atlantic ocean. density of iron is 7856 kgm3. density of salt water is 1020 kgm3.
a four-cylinder four-stroke 2.2 liter gasoline engine operates on the ideal otto cycle with a compression ratio of 10.
question 1. which of the following would be used for the highest temperature measurements ?thermistorthermocoupleic
a solar updraft tower is a large chimney which ventilates heated air from the area surrounding it. this air has been
Air enters a one-inlet, one-exit control volume at 6 bar, 500 K, and 30 m/s through a flow area of 28 cm2. At the exit, the pressure is 3 bar, the temperature is 456.5 K, and the velocity is 300 m/s. The air behaves as an ideal gas. For steady-sta..
An insulated rigid tank contains a saturated liquid-vapor mix of water initially at a pressure of 100 kPa. The mass of the mixture is 5 kg, but only 75.6 % of the total mass is liquid. An electric resistance heater is turned on within the tank until ..
A refrigerant is compressed in the compression cylinder of a refrigerator from p1 = 112 psi, V1 = 13.0 in3 to p2 = 424 psi, V2 = 3.0 in3. Determine a value of n such that the data are fit by an equation of the form pV n = constant. Hint: You can take..
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