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Internal Combustion Engines

Internal Combustion Engines
In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have

Low temperature
Low density
All of these
Long ignition delay

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Internal Combustion Engines
The ignition of the charge by some hot surface within the engine before the passage of spark is called

Ignition delay
Pre-ignition
Detonation
Auto-ignition

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Internal Combustion Engines
The mechanical efficiency (ηm) of the engine is given by

ηm = B.P/I.P
ηm = I.P/B.P
None of these
ηm = (B.P × I.P)/100

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Internal Combustion Engines
Iso-octane (C₈H₁₈) has octane number of

120
0
100
50

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Internal Combustion Engines
In order to eliminate knocking in compression ignition engines, there should be

Short delay period
Late auto-ignition
High self ignition temperature of fuel
Low compression ratio

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Internal Combustion Engines
The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is

Same
Less
More or less depending on power rating
More

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MORE MCQ ON Internal Combustion Engines

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