Aerospace Engineering
2023 · Paper 1
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Complete GATE AE 2023 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 64–65 of 65. Imported answers require review unless explicitly marked reviewed.
Question 64
Open questionAENAT2 marksNeeds review
A centrifugal air compressor has inlet root diameter of 0.25 m and the outlet diameter of the impeller is 0.6 m. The pressure ratio is 5.0. The air at the inlet of the rotor is at 1 atm and 25°C. The polytropic efficiency is 0.8 and slip factor is 0.92. Use
kJ/kg-K and
. The impeller speed in revolutions per minute (RPM) is __________. (round off to the nearest integer)Log in to check the answer
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Open questionAENAT2 marksNeeds review
Consider a cryogenic liquid rocket engine using an expander cycle with liquid hydrogen and liquid oxygen as the two propellants. The mass flow rate of hydrogen
into the combustion chamber is 32 kg/s, and the mass flow rate of oxygen
into the chamber is such that
. The combustion of hydrogen and oxygen is at stoichiometry. Assuming that the rate of the forward reaction is much larger than that of the reverse reaction, the rate of formation of H
O is __________ kmol/s. (round off to the nearest integer)Log in to check the answer
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