A. cavitation of .boiler feed pumps
B. corrosion caused by oxygen
C. heat transfer coefficient
D. pH value of water
E. weight of water to be handled
Related Mcqs:
- Equivalent evaporation of water is the evaporation “for a feed water supply at 100°C__________________?
A. and its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm2
B. and its corresponding conversion into dry steam at desired boiler pressure
C. conversion into steam at atmospheric condition
D. conversion into steam at the same pres-sure at which feed water is supplied
E. none of the above - 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 - Feed water conditioning in thermal power plants in done to__________________?
A. reduce hardness and for removal of solids
B. increase efficiency-of thermal power plant
C. increase *heat transfer rate
D. increase steam parameters
E. all of the above - Duplex feed pumps are used in small steam boilers. These operate on the principle of_________________?
A. centrifugal pump
B. axial flow pump
C. gear pump
D. ejector pump
E. reciprocating pump - A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are________________?
A. supplied by same manufacturer loose and assembled at site
B. supplied mounted on a single base
C. purchased from several parties and packed together at site
D. packaged boiler does not exist
E. none of the above - The feed check valve is used in order to ______________________?
A. regulate flow of boiler water
B. check level of water in boiler drum
C. recirculate unwanted feed water
D. allow high pressure feed water to flow to drum and not allow reverse flow to take place
E. none of the above - Equivalent evaporation is the amount of water evaporated in a boiler from and at ____________________?
A. 0°C
B. 100°C
C. saturation temperature at given pressure
D. room temperature
E. 20°C - For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has ____________________?
A. more heating surface
B. less heating surface
C. equal heating surface
D. heating surface depends on other parameters
E. none of the above - Falling drops of water become spheres due to the property of ____________________?
A. adhesion
B. cohesion
C. surface tension
D. viscosity
E. compressibility - 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
