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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The ratio of total useful heat drop to the total isentropic heat drop, is called

Stage efficiency
Internal efficiency
Rankine efficiency
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio is given by (where p₁ = Initial pressure of steam, and p₂ = Pressure of steam at throat or critical pressure)

p₁/p₂
p₁. p₂
p₁ + p₂
p₂/p₁

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Steam Boilers, Engines, Nozzles and Turbines
Pick up wrong statement about desired properties of a good fuel

Ease in storing
Produce minimum smoke and gases
High calorific value
High ignition point

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Steam Boilers, Engines, Nozzles and Turbines
The pressure at which latent heat of vaporisation of water is zero, is

100 kg/cm²
225.6 kg/cm²
1 kg/cm²
Below atmospheric pressure

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Steam Boilers, Engines, Nozzles and Turbines
Presence of moisture in fuel oil would

Keep the burner tips cool
Aid in proper combustion
Clean the nozzles
Because sputtering, possibly extinguishing flame

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Steam Boilers, Engines, Nozzles and Turbines
The diameter of superheated tubes in a locomotive boiler is

130 mm
31 mm
13 mm
230 mm

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