Score 0 Accepted Answers i and iii are correct Air at a temperature of 30C

Score 0 accepted answers i and iii are correct air at

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Score: 0 Accepted Answers: (i) and (iii) are correct Air at a temperature of 30°C flows into a centrifugal compressor of an impeller diameter of 0.5 m and running at 10000 rpm. The slip factor is 0.9, power input factor is 1.04, and the isentropic efficiency of compression is 80%. Assuming the absolute velocities of air entering and leaving the compressor are same, the static pressure ratio of the compressor is (constant pressure specific heat for air is 1005 J/kgK) in the range of 1.7 to 1.8 2.2 to 2.3 2.7 to 2.8 3.3 to 3.4 No, the answer is incorrect. Score: 0 Accepted Answers: 1.7 to 1.8 Air at a stagnation temperature of 300 K enters the impeller of a centrifugal compressor in the axial direction. The rotor which has 19 radial vanes, rotates at 20000 rpm. The stagnation pressure ratio between the diffuser outlet and the impeller inlet is 3 and the isentropic efficiency is 85%. Assume a power input factor of 1.05 and a slip factor 0.895. For air, constant pressure specific heat =1005 J/kgK, ratio of specific heats=1.4. If the mass flow rate is 3 kg/s, the power input( in kW) to the compressor will be in the range of 190 to 200 290 to 300 390 to 400 490 to 500 No, the answer is incorrect. Score: 0 Accepted Answers: 390 to 400 Previous Page End
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