Which of these fuels has the highest calorific value?
(a) CNG
(b) coal
(c) hydrogen
(d) petrol

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Solution

(c) hydrogen

The calorific value of a fuel is expressed in kilojoule per kg (kJ/kg).
The calorific values of coal, CNG, hydrogen and petrol are as follows:
Coal: 25,000 $-$ 33,000 kJ/kg
CNG: 50,000 kJ/kg,
Hydrogen: 150,000 kJ/kg
Petrol: 45,000 kJ/kg

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Which of these fuels has the highest calorific value? (a) CNG (b) coal (c) hydrogen (d) petrol

(c) hydrogen The calorific value of a fuel is expressed in kilojoule per kg (kJ/kg). The calorific values of coal, CNG, hydrogen and petrol are as follows: Coal: 25,000-33,000 kJ/kg CNG: 50,000 kJ/kg, Hydrogen: 150,000 kJ/kg Petrol: 45,000 kJ/kg

Which of these fuels has the highest calorific value?
(a) CNG
(b) coal
(c) hydrogen
(d) petrol

(c) hydrogen

The calorific value of a fuel is expressed in kilojoule per kg (kJ/kg).
The calorific values of coal, CNG, hydrogen and petrol are as follows:
Coal: 25,000 $-$ 33,000 kJ/kg
CNG: 50,000 kJ/kg,
Hydrogen: 150,000 kJ/kg
Petrol: 45,000 kJ/kg