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STEAM BOILERS, ENGINES, NOZZLES AND TURBINES

Steam Boilers, Engines, Nozzles and Turbines
At critical point, i.e. p=225.65 kg/cm², the latent enthalpy of vaporisation is

Maximum
Minimum
Zero
Depends on temperature also

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Steam Boilers, Engines, Nozzles and Turbines
The high steam and low water safety valve is used to blow off steam when the

None of these
Both (A) and (B)
Steam pressure exceeds the working pressure
Water level in the boiler becomes too low

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Steam Boilers, Engines, Nozzles and Turbines
In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be

0.56
0.78
0.74
0.63

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Steam Boilers, Engines, Nozzles and Turbines
Steam turbines may be classified according to

Number of stages
Direction of steam flow
Mode of steam action
All of these

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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.

Equal
More
Less
None of these

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