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Answer Posted / thowsif_emerson
A variable cycle gas turbine engine includes first and
second compressors ,combustion apparatus and first and
second turbines operable to drive the first and second
compressors respectively via interconnecting shafts. The
capacity of one of the turbines may be varied, for example
by means of guide vanes which can be adjusted to reduce or
increase a throat area through which air leaves the guide
vanes to impact the turbine. The capacity of the turbine
may be increased at low engine speeds, to reduce the
pressure ratio across the turbine and across the
compressor which it drives, thereby improving the surge
margin of the compressor.
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A 15 kw squirrel cage motor having a maximum efficiency of 90% on a continuous full load has temperature rise of 42 degrees celcius after 30 min and 52 degrees celcius after 1 hr under the above operation conditions. a) calculate its final steady state temperature rise on continuous load and the heating time constatnt. b) if the motor is operated on a short load for 9 min estimate its temperature rise. c) calculate the maximum overload that can be applied on a short, 9 min rating so that the temperature rise is the same as the final steady state temperature rise on continuous load.
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