Related Questions

Which of the following impurities in feed water for high pressure boiler is the most detrimental?
A Silica
B Dissolved oxygen
C Suspended salt
D Dissolved salt
The most detrimental impurity in high pressure boiler feed water is
A Suspended salt
B Dissolved salt
C Silica
D Turbidity
A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.
A Blow off cock
B Fusible plug
C Stop valve
D Safety valve
The delivery pressure of boiler feed water pump compared to the boiler steam pressure is
A Same
B Slightly less
C Slightly more
D Much more
The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of __________ of water.
A Dissolved oxygen content
B Biological oxygen demand
C Vapor pressure
D All of the above
When the circulation of water, in a boiler, is by convection currents which are set up during the heating of water, then the boiler is known as
A Internally fired boiler
B Externally fired boiler
C Natural circulation boiler
D Forced circulation boiler
The size of a boiler drum in pulverized fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase
A Increases
B Decreases
C Remains unchanged
D Increases/decreases depending on steam temperature requirements
A device used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit, is called
A Blow off cock
B Stop valve
C Superheater
D None of these
The predominant mode of heat transfer which takes place from boiler furnace to water walls of a boiler is
A Conduction
B Convection
C Both A & B
D Radiation
For the same diameter and thickness of tube, a water tube boiler has ________ heating surface as compared to fire tube boiler.
A More
B Less
C Equal
D None of these

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