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Internal Combustion Engines

Internal Combustion Engines
In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will _________ the knocking tendency.

None of these
Not effected
Decrease
Increase

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Internal Combustion Engines
Diesel fuel, compared to petrol is

Just about the same difficult to ignite
Less difficult to ignite
More difficult to ignite
Highly ignitable

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Internal Combustion Engines
In petrol engines, advancing of the spark timing will ___ the knocking tendency.

Decrease
Not effect
Increase
None of the listed here

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Internal Combustion Engines
A gas engine has a swept volume of 300 cm3 and clearance volume of 25 cm3. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of the mixture taken in per stroke is

248 cm3
264 cm3
252 cm3
286 cm3

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Internal Combustion Engines
The normal heptane (C₇H₁₆) is given a rating of ________ octane number.

120
0
50
100

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Internal Combustion Engines
The voltage required to produce a spark across the gap, between the sparking points is

10,000 to 12,000 volts
2000 to 4000 volts
4000 to 6000 volts
6000 to 10,000 volts

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