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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The pressure velocity compounded impulse turbine allows a bigger pressure drop and hence __________ numbers of stages are required.

None of the listed here
More
Less
Equal

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Steam Boilers, Engines, Nozzles and Turbines
The impulse turbine rotor efficiency will have a maximum value of 0.5 cos 2α, where α is the nozzle exit flow angle, if the

Blades are equiangular and frictionless
Blade solidity is 0.65
Blade velocity coefficient is unity
Blades are equiangular

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Steam Boilers, Engines, Nozzles and Turbines
Locomotive boiler is of the following type

All of the listed here
Horizontal
Internally fired
Multi tubular

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

225.65 kgf/ cm²
1 kgf/ cm²
273 kgf/ cm²
100 kgf/ cm²

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Steam Boilers, Engines, Nozzles and Turbines
The dry saturated steam at very high pressure (150200 kg/cm²) when throttled to atmosphere will become

Wet
Dry
Remain dry saturated
Superheated

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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

0.63
0.74
0.56
0.78

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