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Mastering Bomb Calorimeters

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Questions and Answers

Which scientist is the joule (J) named after?

Isaac Newton

Michael Faraday

Albert Einstein

James Prescott Joule (correct)

What is the mechanical equivalent of heat in joules?

4.186 J/kcal

1 Nm

2000 to 2500 kPa

1 J = 1 Nm (correct)

What is the purpose of the bomb in a bomb calorimeter?

To measure temperature changes

To withstand combustion pressures

To burn the fuel sample (correct)

To hold the water

What is the higher heating value of a fuel?

The heat produced by the combustion of the fuel Signup and view all the answers

Which formula is used to determine the higher heating value (HHV) of a fuel?

Both calorimetry and Dulong's formula Signup and view all the answers

What is the lower heating value (LHV) of a fuel?

The heat energy lost up the stack due to the water vapor in the combustion gases not condensing before leaving the boiler Signup and view all the answers

What is the reduction in heating value (HHV minus LHV) equal to?

The total mass of water vapor per kilogram of fuel multiplied by the latent heat of evaporation Signup and view all the answers

Which analysis is performed on a solid fuel, such as coal, to determine the percentages of moisture, volatile matter, fixed carbon, and ash?

Proximate analysis Signup and view all the answers

What is the formula to calculate the percentage of moisture in the original sample during the proximate analysis?

(\frac{{\text{{loss of mass}}}},{{\text{{original mass}}}} \times 100%) Signup and view all the answers

What is the purpose of the third part of the proximate analysis procedure?

To achieve complete combustion Signup and view all the answers

Which of the following is true about proximate analysis and ultimate analysis?

Proximate analysis calculates the percentage of ash, volatile matter, and moisture, while ultimate analysis determines the elemental components of the fuel. Signup and view all the answers