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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The expansion of steam in a nozzle follows

Rankine cycle
Joule cycle
Carnot cycle
Stirling cycle

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

Minimum
Depends on temperature also
Zero
Maximum

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following is a fire tube boiler?

Babcock and Wilcox boiler
Lancashire boiler
None of these
Yarrow boiler

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Steam Boilers, Engines, Nozzles and Turbines
During polytropic process

Heat transfer takes place across cylinder walls
Work is done
All of these
Steam may be wet, dry or superheated after expansion

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Steam Boilers, Engines, Nozzles and Turbines
Film boiling occurs at

Atmospheric pressures
Very low pressure
Very high pressures
Medium pressures

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Steam Boilers, Engines, Nozzles and Turbines
The fire tubes in a Cochran boiler usually have _________ diameter.

62.5 mm
72.5 mm
6.25 mm
92.5 mm

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