Test: Fuels & Combustion - 3 - Mechanical Engineering MCQ

Calorific value of gaseous fuels can be found be

Which one of the following coal variety has least calorific value?

If x₁ and x₂ be the dryness fractions obtained in separating calorimeter and throttling calorimeter respectively, then the actual dryness friction of steam will be

In a coupled separating and throttling calorimeter, 0.9. is the dryness fraction of steam in the separating unit and 0.95 is the dryness fraction in the throttling unit. What is the approximate value of the dryness fraction of the steam sample?

A thermal electric power plant produces 1000 MW of power. If the coal releases 900 x 10⁷ kJ/h of energy, then what is the rate at which heat is rejected from the power plant?

The higher calorific value of fuel occurs when water vapour

Forced draught fan delivers air at 10 metres/sec against a draught of 25 mm water across the fuel bed on the grate.
The total draught developed by the force draught fan is

Consider the following statements:
1. Induced draught fans require water-cooled bearings.
2. For an induced draught fan installation, the fan size and power requirements are less than those of a forced draught fan installation.
Q. Which of the statements given is/are correct?

For maximum discharge the draught in mm of H₂O is given by (H = height of chimney, T = chimney gas temperature, T₁ = atm temperature)

For a given height of chimney and its cross-sectional area, the maximum discharge through the chimney is given by: (T₁ = atmospheric temp, T = chimney gas temp; m = mass of air/kg fuel)

Draught produced by stack 30 meters high for maximum rate of discharge of hot gases through it at 27°C is

Power required by fan in forced draught is.... to that of induced draught