DC 3RD CLASS BOILER EXAM SCRIPT QUESTIONS AND
ANSWERS GRADED A+
✔✔Water scales can be removed by boiling or raising water temperature is? -
✔✔temporary
✔✔What is the proper way of testing a safety valve? - ✔✔Allow pressure to build up to
75% before lifting the test level
✔✔What a safety valve discharge, it should relieve the boiler so that the pressure does
not Exceed more than ______? - ✔✔6%
✔✔When conducting any evaporation test, the operator must secure what? - ✔✔The
feed water to the boiler
✔✔What steam trap has one movable device that raises to allow steam through and
resets on condensate? - ✔✔Float trap
✔✔What part in a refrigeration, cycle discharges high temperature pressure of vapor? -
✔✔compressor
✔✔What part in a refrigeration cycle discharges low pressure liquid? - ✔✔expansion
valve
✔✔The Chief heat producing elements in fuels contents are? - ✔✔carbon and hydrogen
✔✔Approximate analysis reports which of the following? - ✔✔The volatile matter
percent of moisture fixed, carbon and ash
✔✔What is the maximum range of pressure settings of all the saturated steam safety
valves on boilers? - ✔✔10% of the highest set valve
✔✔What type of valve would you use near the boiler in a blowdown line? - ✔✔Quick
opening
✔✔What type of valve would you use to control blow down? - ✔✔slow opening
✔✔How is a boiler hydrostatic test performed? - ✔✔fill the boiler with 70ºF of water and
raise the pressure to 1.5 MAWP
✔✔A three element feed regulator senses, what to control water flow - ✔✔Water level
steam flow water flow
, ✔✔On/off controls that activate devices using a one variable (i.e. pressure) are called? -
✔✔discrete controls
✔✔Controls which use a quantity measured over a range of dynamic valves are? -
✔✔Analog
✔✔What type of valve would not be a good choice if settlement is present and system?
- ✔✔Globe valve
✔✔Approximate analysis of coal will not report what? - ✔✔Percent of various chemical
elements
✔✔Boiler, Shelby, designed and constructed In accordance with? - ✔✔ASME CSD-1
✔✔Discrete control when used for steam pressure is what type of control? - ✔✔on/off
stop/go
✔✔The purpose of the condenser and our refrigeration system is to? - ✔✔Change the
refrigerant vapor a liquid state
✔✔The __ is where the liquid refrigerant turns to gas and absorbs latent heat -
✔✔Evaporator
✔✔The __ remove moisture from the refrigeration system - ✔✔Filter drier
✔✔The oil and a refrigeration system is used for - ✔✔Cooling and lubrication
✔✔When is a pump steam bound? - ✔✔Steam bound indicates the water is too hot for
the suction of the pump, and the water flashes into steam with reduction of pressure.
✔✔Which condition is a boiler not protected against - ✔✔under pressure
✔✔Which product has the lowest heating value? - ✔✔Blast furnace, gas
✔✔What is the last protection against overheating in a boiler? - ✔✔LWCO
✔✔In an open type expansion tank, how high should the tank be mounted? - ✔✔at least
4 feet above the highest heating element
✔✔Which element does not take an actual action in the combustion process -
✔✔Nitrogen
ANSWERS GRADED A+
✔✔Water scales can be removed by boiling or raising water temperature is? -
✔✔temporary
✔✔What is the proper way of testing a safety valve? - ✔✔Allow pressure to build up to
75% before lifting the test level
✔✔What a safety valve discharge, it should relieve the boiler so that the pressure does
not Exceed more than ______? - ✔✔6%
✔✔When conducting any evaporation test, the operator must secure what? - ✔✔The
feed water to the boiler
✔✔What steam trap has one movable device that raises to allow steam through and
resets on condensate? - ✔✔Float trap
✔✔What part in a refrigeration, cycle discharges high temperature pressure of vapor? -
✔✔compressor
✔✔What part in a refrigeration cycle discharges low pressure liquid? - ✔✔expansion
valve
✔✔The Chief heat producing elements in fuels contents are? - ✔✔carbon and hydrogen
✔✔Approximate analysis reports which of the following? - ✔✔The volatile matter
percent of moisture fixed, carbon and ash
✔✔What is the maximum range of pressure settings of all the saturated steam safety
valves on boilers? - ✔✔10% of the highest set valve
✔✔What type of valve would you use near the boiler in a blowdown line? - ✔✔Quick
opening
✔✔What type of valve would you use to control blow down? - ✔✔slow opening
✔✔How is a boiler hydrostatic test performed? - ✔✔fill the boiler with 70ºF of water and
raise the pressure to 1.5 MAWP
✔✔A three element feed regulator senses, what to control water flow - ✔✔Water level
steam flow water flow
, ✔✔On/off controls that activate devices using a one variable (i.e. pressure) are called? -
✔✔discrete controls
✔✔Controls which use a quantity measured over a range of dynamic valves are? -
✔✔Analog
✔✔What type of valve would not be a good choice if settlement is present and system?
- ✔✔Globe valve
✔✔Approximate analysis of coal will not report what? - ✔✔Percent of various chemical
elements
✔✔Boiler, Shelby, designed and constructed In accordance with? - ✔✔ASME CSD-1
✔✔Discrete control when used for steam pressure is what type of control? - ✔✔on/off
stop/go
✔✔The purpose of the condenser and our refrigeration system is to? - ✔✔Change the
refrigerant vapor a liquid state
✔✔The __ is where the liquid refrigerant turns to gas and absorbs latent heat -
✔✔Evaporator
✔✔The __ remove moisture from the refrigeration system - ✔✔Filter drier
✔✔The oil and a refrigeration system is used for - ✔✔Cooling and lubrication
✔✔When is a pump steam bound? - ✔✔Steam bound indicates the water is too hot for
the suction of the pump, and the water flashes into steam with reduction of pressure.
✔✔Which condition is a boiler not protected against - ✔✔under pressure
✔✔Which product has the lowest heating value? - ✔✔Blast furnace, gas
✔✔What is the last protection against overheating in a boiler? - ✔✔LWCO
✔✔In an open type expansion tank, how high should the tank be mounted? - ✔✔at least
4 feet above the highest heating element
✔✔Which element does not take an actual action in the combustion process -
✔✔Nitrogen
