GATE ME 2014 Set 3 — Question 59
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Thermodynamics → IC Engines → Otto, Diesel & Dual Cycles
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Question
A diesel engine has a compression ratio of 17 and cut-off takes place at 10% of the stroke. Assuming ratio of specific heats () as 1.4, the air-standard efficiency (in percent) is _______
Correct answer
58 to 62
Solution
Given:
Compression ratio,
Ratio of specific heats,
Cut-off takes place at 10% of the stroke.Step 1: Calculate the cut-off ratio ().
The stroke volume is .
The cut-off volume is .
Since , we can write:
Dividing by :
Step 2: Calculate the air-standard efficiency () of the Diesel cycle.
Step 3: Convert to percentage.
The value lies within the range of 58 to 62.
Compression ratio,
Ratio of specific heats,
Cut-off takes place at 10% of the stroke.Step 1: Calculate the cut-off ratio ().
The stroke volume is .
The cut-off volume is .
Since , we can write:
Dividing by :
Step 2: Calculate the air-standard efficiency () of the Diesel cycle.
Step 3: Convert to percentage.
The value lies within the range of 58 to 62.
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