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Steam Boilers, Engines, Nozzles and Turbines

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

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

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Steam Boilers, Engines, Nozzles and Turbines
The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as

Bleeding
Reheating of steam
None of these
Regenerative heating

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Steam Boilers, Engines, Nozzles and Turbines
The diameter of a cylindrical shell of a Scotch marine boiler varies from

2.5 to 3.5 m
1.5 to 2 m
None of these
3.5 to 4.5 m

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Steam Boilers, Engines, Nozzles and Turbines
The function of a cross-head is to guide motion of the _________ and to prevent it from bending.

Piston rod
Eccentric rod
Valve rod
Connecting rod

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Steam Boilers, Engines, Nozzles and Turbines
The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)

V = 44.72 K hd
V = 44.72 hd K
V = 44.72 K hd
V = 44.72 K hd

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called

Boiler efficiency
Vacuum efficiency
Nozzle efficiency
Condenser efficiency

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