1. What is the ignition temperature of a good fuel?
a) High
b) Low
c) Moderate
d) 1000C
Explanation: The ignition temperature of a good fuel must be moderate because it is really hard to produce more heat and It requires large amount energy to produce high temperature and to achieve too low temperatures is also a difficult task. Moderate temperature can be produced easily.
2. What is the calorific value of an ideal fuel?
a) 30.8k.cal
b) High
c) 20.2k.cal
d) Low
Explanation: An ideal fuel must contain high calorific value. A calorific value is the amount of heat produced by complete combustion of a good fuel. So, more the fuel which produces more heat on complete burning will be the ideal one.
3. The rate of combustion of a good fuel must be ________
a) Controllable
b) High
c) Low
d) Very high
Explanation: The rate of the combustion of a good fuel must be controllable because if it is high or very high we cannot calculate the time taken by the fuel to burn and if it is low also we cannot observe the time taken.
4. The products of combustion of a good fuel _________
a) CO2
b) CO
c) Must not be harmful
d) Must be harmful
Explanation: The good fuel must not produce harmful products that affect the surroundings and nature. Both CO and CO2 are harmful gases.
5. The moisture content of the good fuel must be _________
a) 50%
b) High in amount
c) Low in amount
d) 70%
Explanation: We cannot say exact moisture content of a good fuel but it must be low in amount because the fuel with high moisture content will not burn properly and results in less heat and less calorific value. For a good fuel calorific value is more.
6. Artificial fuels are mainly prepared from ________
a) petrol
b) peat
c) coal
d) natural gas
Explanation: Artificial fuels are produced by man. Peat, coal and natural gas are directly available from nature. Petrol is produced by a man using a fractional distillation process.
7. On combusting a solid fuel, the final product obtained in high amount is ________
a) oxygen
b) nitrogen
c) ash
d) ozone
Explanation: After combusting a fuel the product left in more amount is ash. The oxygen and ozone cannot be produced in most of the cases. Nitrogen may be produced but in small amount than that of ash.
8. The major advantage of a good fuel is _______
a) ease of transportation
b) production of more oxygen
c) production of more nitrogen
d) production of more vapor
Explanation: The good fuel can be transported easily. It is the main advantage of good fuel. It reduces the cost of transportation and makes it ideal.
9. Which of the following is a synthetic fuel in gas form?
a) Natural gas
b) Producer gas
c) LPG
d) Petroleum
Explanation: The producer gas is a synthetic fuel in gas form whereas, natural gas is a natural fuel in gas form. LPG and petroleum are liquid fuels.
10. A fuel is a combustible substance containing ______ as major constitute.
a) nitrogen
b) oxygen
c) carbon
d) hydrogen
Explanation: In every fuel the major constitute is carbon. The other components like oxygen, nitrogen, hydrogen and sulphur are also present but in very small amounts when compared to carbon.