Question

A fuel with a higher octane rating:

• A. is less prone to auto-ignition
• B. can withstand a greater rise in temperature during the compression stroke
• C. has lower cetane number
• D. has lesser knocking

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A has lesser knocking
B can withstand a greater rise in temperature during the compression stroke
C is less prone to auto-ignition
D has lower cetane number

• The fuels with higher octane ratings will require high activation energies and are less prone to auto-ignition.
• They can withstand the greater rise in temperature during the compression stroke of an internal combustion engine without auto igniting and thus allow more power to be extracted.
• They have lower cetane number. Cetane number and octane rating are opposite to each other.
• A fuel with higher octane rating leads to less engine knocking.