250+ TOP MCQs on Fuels and Answers

IC Engines Multiple Choice Questions on “Fuels”.

1. Ignition quality of petrol is expressed by?
a) octane number
b) calorific value
c) self ignition temperature
d) cetane number
Answer: a
Clarification: 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
Answer: b
Clarification: 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
Answer: c
Clarification: 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
Answer: d
Clarification: None.

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
Answer: c
Clarification: None.

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
Answer: b
Clarification: None.

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
Answer: d
Clarification: None.

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
Answer: a
Clarification: 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
Answer: a
Clarification: None.

10. Which of the following is the lightest and most volatile liquid fuel?
a) diesel
b) petrol
c) gasoline
d) fuel oil
Answer: c
Clarification: Gasoline is the lightest and most volatile liquid fuel.

11. Polymerization is a chemical process in which molecules of a compound become ___________
a) larger
b) smaller
c) liquid
d) gaseous
Answer: a
Clarification: Polymerization is defined as a chemical process in which molecules of a compound become larger.

12. Diesel fuel, compared to petrol is ___________
a) less difficult to ignite
b) just about the same difficult to ignite
c) more difficult to ignite
d) none of the mentioned
Answer: c
Clarification: None.

13. In a diesel engine the diesel fuel injected into cylinder would burn instantly at about compressed air temperature of ___________
a) 250ºC
b) 500ºC
c) 1000ºC
d) 1500ºC
Answer: c
Clarification: None.

14. When crude oil is heated, then which of the following hydrocarbon is given off first?
a) kerosene
b) gasoline
c) paraffin
d) natural gas
Answer: d
Clarification: When crude oil is heated, then natural gas is given off first.

15. Gaseous fuel guarantees are based on ___________
a) calorific value of oil
b) low heat value of oil
c) mean heat value of oil
d) none of the mentioned
Answer: b
Clarification: None.