Engineering
06.02.2023 02:26
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On a mollier diagram show all the stagnation and static points required to represent

On a mollier diagram show all the stagnation and static points required to represent the complete flow process in a diffuser. air enters a diffuser with an average velocity of 375 m/s at a stagnation pressure and temperature of 360 kpa and 470 k respectively and leaves at a stagnation pressure of 300 kpa with an average velocity of 120 m/s and a static pressure of 280 kpa. determine (i) the static pressure and mach number of the air at inlet (ii) the diffuser efficiency, (iii) the mach number at exit and the overall entropy increase.
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brownzackery71
brownzackery71
4,6(52 marks)

P_O = 0.989 watt = 19.9 dBm

Explanation:

Given data:

P_1 power = 20 dBm  = 0.1 watt

coupling factor is 20dB

Directivity = 35 dB

We know that

coupling factor = 10 log \frac{P_1}{P_f}

solving for  final power

20 = 10 log\frac{P_1}{P_f}

2 = log \frac{P_1}{P_f}

100 = \frac{0.1}{P_f}

P_f = 0.001 watt = 0 dBm

Directivity D =  10 \frac{P_f}{P_b}

35 = 10 \frac{0.001}{P_b}

P_b = 3.162 \times 10^{-7} wattt

output Power  = P_1 -P_f - P_b

                       = 0.1 - 0.001 - 3.162 \times 10^{-7}

P_O = 0.989 watt = 19.9 dBm

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