1. Ignition quality of petrol is expressed by?
a) octane number
b) calorific value
c) self ignition temperature
d) cetane number
Explanation: Ignition quality of petrol is expressed by octane number and that of diesel by cetane number.
2. Petrol is distilled at a temperature in range of ______________
a) 30-65ºC
b) 65-220ºC
c) 220-350ºC
d) 350-450ºC
Explanation: Petrol is distilled at a temperature in range of 65-220ºC while kerosene is distilled at 220-350ºC.
3. Kerosene is distilled at ____________
a) 30-65ºC
b) 65-220ºC
c) 220-350ºC
d) 350-450ºC
Explanation: Kerosene is distilled at 220-350ºC and petrol is distilled at a temperature in range of 65-220ºC.
4. Self-ignition temperature of petrol is of the order of ____________
a) 150ºC
b) 240ºC
c) 370ºC
d) more than 500ºC
Explanation: more than 500ºC
5. What is Iso-octane?
a) It has an octane number of 0
b) It has an octane number of 50
c) It has an octane number of 100
d) none of the mentioned
Explanation: It has an octane number of 100
6. Octane number is determined by comparing the performance of petrol with the following hydro-carbons?
a) iso-octane
b) mixture of normal heptane and iso octane
c) alpha methyl napthalene
d) none of the mentioned
Explanation: mixture of normal heptane and iso octane
7. What is Cetane?
a) It has zero cetane number
b) It has 100 cetane number
c) It helps detonation
d) It is a straight chain paraffin
Explanation: It is a straight chain paraffin
8. Ethyl fluid is used ___________
a) to increase the octane rating of the fuel
b) to increase the cetane rating of the fuel
c) as a defrosting agent
d) none of the mentioned
Explanation: For practical purposes, ethyl fluid is used to increase the octane rating of the fuel.
9. Normal heptane ___________
a) accelerates auto-ignition
b) helps to resist auto-ignition
c) does not affect auto-ignition
d) none of the mentioned
Explanation: Normal heptane accelerates auto-ignition
10. Which of the following is the lightest and most volatile liquid fuel?
a) diesel
b) petrol
c) gasoline
d) fuel oil
Explanation: Gasoline is the lightest and most volatile liquid fuel.