OHIO BOILERS FINAL EXAMS ACTUAL QUESTIONS
AND ANSWERS SURE A+
✔✔a superheater saftey valve relieves how much of the total steam produced by a
boiler? - ✔✔20%
✔✔how much steam flow. at a minimum should be maintained through the
superheater? - ✔✔20% of the boiler capacity
✔✔what is the purpose of a water screen? - ✔✔to prevent slagging
✔✔What is required if the boiler pressure is greater or equal to 400 psig? - ✔✔2 direct-
reading mechanical gauge glasses or one mechanical and two remote level inicators
✔✔What cant you do to valves connected to a water column while boiler is in operation
- ✔✔remove them
✔✔(LP) if you close the bottom blowdown valve on the water column and the water fills
up quickly to the center of the gauge glass, this is an indication that? - ✔✔the water
column piping is free of scale and sludge
✔✔what type of feedwater regulator is equipped with a fuel shutoff? - ✔✔float type
, ✔✔when water is added to the boiler, what will occur? - ✔✔the water level will drop
initially the rise
✔✔when using a pneumatic feedwater regulating system with a remote manual/
automatic selector, how my the control lines be checked for leakage? - ✔✔set the
control on resest
✔✔what type of feedwater regulator is best for a boiler that has wide pressure and load
swings? - ✔✔three-element feedwater regulator
✔✔when using a three-elelment feedwater regulating system, which is the analog
input? - ✔✔the drum level
✔✔(LP) how often should the makeup water feeder in a LP boiler be blown down? -
✔✔once per week
✔✔(LP) a strainer protects the automatic makeup feeder from scale and lime deposits.
this strainer should be cleaned at least once___? - ✔✔a month or if the build up of
deposits require it
✔✔(LP) what is true about a makeup water feeder on a low pressure boiler system? -
✔✔using cold city water makeup can lower overall boiler efficiency
✔✔what describes the principle of operation of a centrifugal pump - ✔✔uses kinetic
engery to move liquid by means of a rotating impeller and circular pump casing
✔✔on a pump that must draw its suction from below, what is the biggest limitation? -
✔✔atmospheric pressure and the water temp
✔✔a centrifugal turbine pump is characterized by its? - ✔✔diffusion rings
✔✔a centrifugal pumps performance and long life are dependent on? - ✔✔wear rings
seals and thrust imposed
✔✔when starting a centrifugal pump, the valves should be set up with the? - ✔✔suction
open, discharge closed
✔✔the energy needed to fill the suction side of a centrifugal pump and overcome friction
and flow losses is referred to as __ head? - ✔✔net positive suction
✔✔a lubrication with a low viscosity is usually? - ✔✔adapted to high rpm use
AND ANSWERS SURE A+
✔✔a superheater saftey valve relieves how much of the total steam produced by a
boiler? - ✔✔20%
✔✔how much steam flow. at a minimum should be maintained through the
superheater? - ✔✔20% of the boiler capacity
✔✔what is the purpose of a water screen? - ✔✔to prevent slagging
✔✔What is required if the boiler pressure is greater or equal to 400 psig? - ✔✔2 direct-
reading mechanical gauge glasses or one mechanical and two remote level inicators
✔✔What cant you do to valves connected to a water column while boiler is in operation
- ✔✔remove them
✔✔(LP) if you close the bottom blowdown valve on the water column and the water fills
up quickly to the center of the gauge glass, this is an indication that? - ✔✔the water
column piping is free of scale and sludge
✔✔what type of feedwater regulator is equipped with a fuel shutoff? - ✔✔float type
, ✔✔when water is added to the boiler, what will occur? - ✔✔the water level will drop
initially the rise
✔✔when using a pneumatic feedwater regulating system with a remote manual/
automatic selector, how my the control lines be checked for leakage? - ✔✔set the
control on resest
✔✔what type of feedwater regulator is best for a boiler that has wide pressure and load
swings? - ✔✔three-element feedwater regulator
✔✔when using a three-elelment feedwater regulating system, which is the analog
input? - ✔✔the drum level
✔✔(LP) how often should the makeup water feeder in a LP boiler be blown down? -
✔✔once per week
✔✔(LP) a strainer protects the automatic makeup feeder from scale and lime deposits.
this strainer should be cleaned at least once___? - ✔✔a month or if the build up of
deposits require it
✔✔(LP) what is true about a makeup water feeder on a low pressure boiler system? -
✔✔using cold city water makeup can lower overall boiler efficiency
✔✔what describes the principle of operation of a centrifugal pump - ✔✔uses kinetic
engery to move liquid by means of a rotating impeller and circular pump casing
✔✔on a pump that must draw its suction from below, what is the biggest limitation? -
✔✔atmospheric pressure and the water temp
✔✔a centrifugal turbine pump is characterized by its? - ✔✔diffusion rings
✔✔a centrifugal pumps performance and long life are dependent on? - ✔✔wear rings
seals and thrust imposed
✔✔when starting a centrifugal pump, the valves should be set up with the? - ✔✔suction
open, discharge closed
✔✔the energy needed to fill the suction side of a centrifugal pump and overcome friction
and flow losses is referred to as __ head? - ✔✔net positive suction
✔✔a lubrication with a low viscosity is usually? - ✔✔adapted to high rpm use
