Question 71 : ____________ prohibits the use of alcohols directly in petrol engines.
1. high cost and availability
2. low octane number
3. low flash point
4. low calorific value
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Question 72 : Improper storage condition results weathering of coal and spontaneous combustion, which increases its
1. caking index
2. yield of carbonised products
3. calorific value
4. friability and oxygen content
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Question 73 : Which of these is not a component of coal in Ultimate Analysis?
1. carbon
2. sulphur
3. ash
4. phosphor
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