Good Fuel

Q.

(a) What is a fuel? Give five examples of fuels.
(b) What are the characteristics of an ideal fuel (or good fuel) ?
(c) The calorific value and ignition temperature of fuel A re 55 kj/g and ${80}^{\circ }C,$ respectively. These values for fuel B are 80 kj/g and ${10}^{\circ }C,$ respectively. On burning, the fuel A produces $C{O}_{2}and{H}_{2}O$ while the fuel B produces $C{O}_2,COandS{O}_2$. Give three points of relative advantages and disadvantages of these two fuels.

Q.

Define calorific value of a fuel.

Q. What are the disadvantages of using hydrogen as a fuel?

1. Highly explosive
2. Transportation is very risky
3. Electrolysis is an expensive process for hydrogen generation
4. All of the above

Q.

What is the main component in CNG?

Q.

The fuel having the lowest calorific value is:
(a) coal (b) wood (c) charcoal (d) kerosene

Q.

A good fuel is one which possesses:
(a) high calorific value and low ignition temperature
(b) high calorific value and high ignition temperature
(c) high calorific value and moderate ignition temperature
(d) low calorific value and moderate ignition tempeature

Q.

What is a good source of energy?

Q.

Which of the following fuels has the highest calorific value?
(a) natural gas (b) methane gas (c) hydrogen gas (d) biogas

Q.

"The calorific value of cooking gas (LPG) is 50 kJ/g". What does it mean?

Q.

What are examples of stored energy?

Q.

Arrange the following fuels in the order of decreasing calorific values (keeping the fuel with the highest calorific value first):
Biogas, Kerosene, Wood, Petrol, Hydrogen gas, Methane

Q.

Which of the following produces more heat (per unit mass) on burning?
Coal or LPG

Q. Why is LPG considered a good fuel?

Q.

Why is LPG considered a better fuel than coal?

Q.

The main constituent of CNG is ______.

1. Ethane

2. Methane

3. Propane

4. Butane

Q. Explain why, natural gas is considered to be a good fuel.

Q.

Calorific value and ignition temperature of fuel X are 75 kj/g and ${20}^{\circ }C$ respectively. These values for fuel Y are 50 kj/g and ${75}^{\circ }C$ respectively. On burning, the fuel Y produces only $C{O}_2$ while fuel X produces $C{O}_2$ and CO. Which of the two is a better fuel? Give two reasons to support your answer.

Q. Give one example of a good domestic fuel.

Q. Which of the two is a cleaner fuel : hydrogen or CNG ? Why ?

Q. Why is bio gas a better fuel than animal dung cakes?
please answer according to 5 Mark question

Q.

The fuel having a calorific value of 55 kj/g is likely to be:
(a) biogas (b) methane gas (c) hydrogen gas (d) natural gas

Q.

Fill in the following blank with a suitable word:
The amount of heat produced by burning a unit mass of a fuel completely is known as its ................ value.

Q.

What is meant by firewood?

Q.

One of the following is not a characteristic of a good fuel. This is:
(a) high calorific value (b) no emission of smoke (c) smooth burning (d) high ignition temperature

Q.

There are four fuels which all contain only carbon and hydrogen. The fuel having highest calorific value will be one which has:
(a) more of carbon but less of hydrgogn (b) less of carbon but more of hydrogen
(c) equal proportions of carbon and hydrogen (d) less of carbon as well as less of hydrogen

Q.

Arrange the following fuels in the order of increasing calorific values ( keeping the fuel with lowest calorific value first) :
LPG, Coal, Alcohol, Dung cakes, Diesel

Q. Which of the following is not used as a fuel?

1. 
   Hydrogen
2. 
   Methane
3. 
   Carbon dioxide
4. Natural gas

Q.

State the modern unit of heat energy. How is this unit related to calories?

Q. write the advantages and disadvantages of Biomass.

Q. Most of the fuels contain carbon as one of the constituents. Name a fuel which has very high calorific value but does not contain carbon.