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Internal Combustion Engines

Internal Combustion Engines
If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the percentage increase in efficiency will be

0.08
0.02
0.04
0.14

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Internal Combustion Engines
The cetane (C₁₆H₃₄) which is a straight chain paraffin, is assigned a cetane number of

50
100
120

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Internal Combustion Engines
In the crankcase method of scavenging, the air pressure is produced by

Centrifugal pump
Supercharger
Movement of engine piston
Natural aspirator

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Internal Combustion Engines
Which of the following is false statement?Excess quantities of sulphur in diesel fuel are Objectionable because it may cause the following

Formation of hard coating on piston skirts
Piston ring and cylinder wear
Detonation
Oil sludge in the engine crank case

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Internal Combustion Engines
The theoretically correct mixture of air and petrol is

15 : 1
10 : 1
20 : 1
25 : 1

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Internal Combustion Engines
The scavenging efficiency of a four stroke cycle diesel engine is

Between 95 and 100%
Below 50%
Between 85 and 95%
Between 50 and 85%

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