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Question

In an air standard diesel cycle the fuel cut off ratio is 2. If the temperature at the start of compression stroke is 27C, then the temperature (in K) at the end of expansion stroke is __________.
(Rounded upto one decimal place)
  1. 791.7

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Solution

The correct option is A 791.7
T4T1=T4T3×T3T2×T2T1=(V3V4)γ1×(V3V2)×(V1V2)1=(V3V4×V1V2)γ1×(V3V2)=(V3V2)γ1×V3V2[V4=V1]=(V3V2)T=21.4=2.64T4=T1×2.64=300×2.64=791.7 K

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