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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

Rankine efficiency
Internal efficiency
Stage efficiency
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The compounding of turbines is done in order to

Reduce exit losses
Reduce speed of rotor
Improve efficiency
All of these

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Steam Boilers, Engines, Nozzles and Turbines
The actual vacuum in a condenser is equal to

Barometric pressure - actual pressure
Gauge pressure + atmospheric pressure
Barometric pressure + actual pressure
Gauge pressure - atmospheric pressure

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Steam Boilers, Engines, Nozzles and Turbines
The diameter of fire tube of Cornish boiler compared to its shell is

One fifth
One third
One fourth
One half

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity ‘V’ at inlet)

Vb = 0.5 V cosα
Vb = V² cos α
Vb = V cos α
Vb = 0.5 V² cosα

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Steam Boilers, Engines, Nozzles and Turbines
Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of

Raising of steam temperature
Higher effectiveness of boiler
High calorific value coal being burnt
Fouling of heat transfer surfaces

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