GATE AG 2017 • Q9 NAT • 2 Marks

Section 3: Farm Power

Farm Power

Subtopic: Fuels and combustion

Question Statement:

A diesel fuel has same ignition delay as that of blend of two reference fuels namely 56% n-cetane and 44% hepta-methylnonane. The cetane number of the diesel fuel is __________.

Official Answer Key:

62.6 to 62.6

Step-by-Step Solution & Explanation

• Cetane number of a reference blend = (%n-cetane × 100) + (%HMN × 15), since by definition n-cetane has CN = 100 and heptamethylnonane (HMN) has CN = 15. • CN = 0.56 × 100 + 0.44 × 15 = 56 + 6.6 = 62.6.

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