Fuel

Q. When will the gross and net calorific value of a fuel be the same?

1. Depends upon the state of the fuel.
2. If it's carbon content is very low.
3. If it's hydrogen content is zero.
4. If it's ash content is zero.

Q. Statement 1: Alcohol and petrol can be used as household fuels for cooking.
Statement 2: They are highly inflammable substances.

1. Both statements are correct and Statement 2 is the correct explanation of Statement 1.
2. Both statements are correct, but Statement 2 is not the correct explanation of Statement 1.
3. Statement 1 is correct but Statement 2 is incorrect.
4. Statement 1 is incorrect but Statement 2 is correct.

Q.

Fuel must be heated to its before it starts burning.

Q.

The substance expected to have the highest ignition temperature out of the following is

1. kerosene

2. petrol
3. coal
4. alcohol