Related Questions

The fuels in order of decreasing knock tendency for spark ignition engines are
A Paraffin, aromatic, napthene
B Paraffin, napthene, aromatic
C Napthene, aromatics, paraffin
D Napthene, paraffin, aromatic
In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have
A Low density
B Low temperature
C Long ignition delay
D All of these
The advancing of spark timing in spark ignition engines will _________ knocking tendency.
A Increase
B Reduce
C Not effect
D None of these
The most accurate ignition system of a spark ignition engine is
A Magneto system
B Battery system
C Electronic control unit system
D Magneto and electronic system
The ignition in a spark ignition engine takes place when the piston is
A Exactly at the T.D.C. position on its compression stroke
B Approaching the T.D.C. position on its compression stroke
C Leaving the T.D.position on its compression stroke
D Approaching the T.D.C. position on its exhaust stroke
The auto ignition in a spark ignition engine means
A Automatic ignition of the charge at the end of compression
B Ignition induced by the passage of a spark
C Ignition of the charge before the passage of flame front
D Ignition induced to supplement the process of normal combustion
The best fuels for compression ignition engines are
A Straight chain paraffin
B Aromatics
C Branched chain paraffin
D Naphthalene
The spark ignition engines are governed by
A Hit and miss governing
B Qualitative governing
C Quantitative governing
D Combination of (B) and (C)
The knocking in spark ignition engines can be reduced by
A Retarding the spark
B Increasing the engine speed
C Both (A) and (B)
D None of these
In spark ignition petrol engines maximum emission of Nox takes place when the air fuel ratio (A/F) is
A Very weak mixture and A/F ratio about 19
B Weak mixture and A/F ratio about 17
C Chemically correct mixture and A/F ratio about 15
D Rich mixture and A/F ratio about 13.

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