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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The performance of a boiler is measured by the

Steam produced in kg/h
All of the listed here
Amount of water evaporated per hour
Steam produced in kg/kg of fuel burnt

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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
Below atmospheric pressure
1 kg/cm²

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Steam Boilers, Engines, Nozzles and Turbines
The maximum efficiency of a reaction turbine is

(1 + cos²α)/2 cos²α
2 cos²α/(1 + cos²α)
(1 + sin²α)/2 sin²α
2 sin²α/(1 + sin²α)

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Steam Boilers, Engines, Nozzles and Turbines
O₂ content in atmospheric air on weight basis is

0.23
0.4
0.3
0.21

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Steam Boilers, Engines, Nozzles and Turbines
For the same diameter and thickness of tube, a water tube boiler has ________ heating surface as compared to fire tube boiler.

Less
None of these
More
Equal

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Steam Boilers, Engines, Nozzles and Turbines
Latent heat of dry steam at atmospheric pressure is equal to

539 BTU/ lb
100 kcal/ kg
539 kcal/ kg
427 kcal/ kg

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