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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Boiler parameters are expressed by

Pressure of steam in kg/cm²
All of these
Temperature of steam in °C
Tonnes/hr. of steam

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Steam Boilers, Engines, Nozzles and Turbines
Fire tube boilers are those in which

Water passes through the tubes and flue gases around it
Tubes are laid vertically
Flue gases pass through tubes and water around it
Forced circulation takes place

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Steam Boilers, Engines, Nozzles and Turbines
The numbers of fire tubes in a Cochran boiler are

75
225
165
115

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Steam Boilers, Engines, Nozzles and Turbines
The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is

May be less or more depending on temperature
Less
More
Equal

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Steam Boilers, Engines, Nozzles and Turbines
Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to

102 kg.m
539 kg.m
421 kg.m
421 kg.m

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following is correct? (Where pa = Actual mean effective pressure, pm = Theoretical mean effective pressure, and K = Diagram factor)

pa = pm/K
pa = K/pm
pa = pm × K
pa = pm + K

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