A. create vacuum
B. inject chemical solution in feed pump
C. pump water, similar to boiler feed pump
D. add make up water in the system
E. none of the above
Related Mcqs:
- 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 - In order to prevent formation of carbon on the injector, the temperature of nozzle tip should be__________________?
A. less than 100°C
B. between 100-250°C
C. between 250 – 300°C
D. between 400 – 500°C
E. between 500 – 1000°C - In a diesel engine, injection pressure developed by injector is of the order of______________?
A. 10 kg/cm2
B. 100 kg/cm2
C. 500 kg/cm2
D. 1400 kg/cm2 - Water tube boilers are those in which________________?
A. flue gases pass through tubes and water around it
B. water passes through the tubes and flue gases around it
C. work is done during adiabatic expansion
D. change in enthalpy
E. none of the above - Which of the following boilers is best suited to meet fluctuating demands___________________?
A. babcock and wilcox
B. locomotive
C. lancashire
D. cochran
E. comish - Fire tube boilers are those in which__________________?
A. flue gases pass through tubes and water around it
B. water passes through the tubes and flue gases around it
C. forced circulation takes place
D. tubes are laid vertically
E. none of the above - A fusible plug is fitted in small boilers in order to ___________________?
A. avoid excessive build up of pressure
B. avoid explosion
C. extinguish fire if water level in the boiler falls below alarming limit
D. control steam dome
E. remove molten aslj - Pick up the wrong statement about water tube boiler in comparison to fire tube boilers ______________________?
A. former generates steam at high pressure
B. former occupies less space for same power
C. rate of steam flow is more in former case
D. former is used for high installed capacity
E. chances of explosion are less in former case - The economizer is used in boilers to _______________________?
A. increase thermal efficiency of boiler
B. economise on fuel
C. extract heat from the exhaust flue gases
D. increase flue gas temperature
E. to heat feed water by bled steam - 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
