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.Management Sciences
Category: Steam Boilers, Engines, Nozzles and Turbines
The crown of the fire box is made hemispherical in order to___________________?
A. give maximum space
B. give maximum strength
C. withstand pressure inside boiler ,
D. resist intense heat in fire box
E. enable easy,manufacture
The function of injector used in small steam plants is to________________?
A. create vacuum in furnace
B. create vacuum at turbine exhaust
C. pump feed water
D. dose chemicals in feed water
E. control steam temperature by injecting water
On Mollier chart, flow through turbine is represented by ________________?
A. horizontal straight line
B. vertical straight line
C. straight inclined line
D. curved line
E. none of the above
In water wall furnace, the heat is transferred to the water-walls by _________________?
A. convection
B. radiation
C. conduction
D. radiation and conducton
E. radiation and convection
An economiser in a boiler______________________?
A. increases steam pressure
B. increases steam flow
C. decreases fuel consumption
D. decreases steam pressure
E. increases life of boiler
Steam engine operates on_________________?
A. carnot cycle
B. joule cycle
C. Stirling cycle
D. brayton cycle
E. none of the above
Stoichiometric quantity of air is the___________________?
A. air present in atmosphere at NTP conditions
B. air required for complete combustion of fuel with no excess air
C. air required for optimum combustion so as to have reasonable excess air
D. air required to convert CO into C02
E. air required to form an explosive mixture
Pick up the wrong statement about critical condition of steam___________________?
A. latent heat is zero
B. liquid directly becomes steam
C. specific volume of steam and liquid is same
D. this is the maximum pressure limit
E. all properties of liquid and steam are same
The basic job of feed water treatment in boilers is to overcome the problem of __________________?
A. corrosion
B. scale
C. carryover
D. embrittlement
E. all of the above
Fire tube boilers are limited to a maximum design working pressure of ____________________?
A. 1 kg/cm
B. 6 kg/cm
C. 17 kg/cm2
D. 100 kg/cm2
E. 250 kg/cm2
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