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Internal Combustion Engines

Internal Combustion Engines
The cetane number of diesel oil, generally available, is

25 to 30
30 to 40
20 to 25
40 to 55

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Internal Combustion Engines
A spark plug gap is kept from

0.2 to 0.8 mm
0.4 to 0.9 mm
0.3 to 0.7 mm
0.6 to 1.0 mm

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Internal Combustion Engines
A diesel engine has compression ratio from

15 to 25
25 to 40
6 to 10
10 to 15

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Internal Combustion Engines
The function of a distributor in a coil ignition system of I.C. engines is

To distribute spark
To time the spark
To distribute current
To distribute power

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Internal Combustion Engines
The increase of cooling water temperature in petrol engine will _________ the knocking tendency.

Not effect
Decrease
Increase
None of these

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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 the listed here
ηm = (B.P × I.P)/100

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