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Internal Combustion Engines

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

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

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Internal Combustion Engines
Gaseous fuel guarantees are based on

Low heat value of oil
Calorific value of oil
High heat value of oil
Mean heat value of oil

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Internal Combustion Engines
The _________ engines can work on very lean mixture of fuel.

Compression ignition
Both (A) and (B)
Spark ignition
None of these

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Internal Combustion Engines
High speed compression engines operate on

Otto cycle
Dual combustion cycle
Diesel cycle
All of these

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Internal Combustion Engines
Thermal efficiency of a two stroke cycle engine is ___ a four stroke cycle engine.

Greater than
Equal to
Less than
None of the listed here

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

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

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