OHIO BOILERS UPDATED EXAMS SCRIPT QUESTIONS
AND ANSWERS SURE A+
✔✔how many sq ft of heating surface are required to produce 1 hp in a HRT firetube
boiler? - ✔✔12
✔✔How many sq ft of heating surface are required to produce 1 hp in a vertical firetube
boiler? - ✔✔14
✔✔how many sq ft of heating surface are required to produce 1 hp in a watertube
boiler? - ✔✔10
✔✔if a high pressure boiler is at its highest operation pressure below MAWP. where will
the pointer on the pressure gague be? - ✔✔12 o' clock
✔✔(LP) a gauge that reads higher than the actual boiler pressure is called a? - ✔✔fast
gauge
✔✔which is true about a boiler pressure mercury switch? - ✔✔must be installed with
pigtail siphon vertically
✔✔(LP) on low pressure boiler, cutout equals:? - ✔✔cut in plus differential
, ✔✔(LP) on a low pressure boiler, the pressure switch is installed: - ✔✔vertical with high
point up
✔✔What is the maximum blowback on a saftey relief valve that is set for 100 psig? -
✔✔4 psig
✔✔if a high pressure boiler operated at 100 psig, what should be the blowback of the
safety valve? - ✔✔not more than 4% and not less than 2 psig in any case
✔✔What is the minimum blowback on a safety valve that pops at 250psi - ✔✔5psi.
✔✔(LP) a data plate on a safety valve on a low pressure boiler is marked 6900lb, this
refers to? - ✔✔lb/hr capacity of the safety valve
✔✔when an accumulation test is performed, the boiler is fired at? - ✔✔Max firing rate
with the main steam stop valve closed
✔✔a safety valve is set on a 50 psi boiler system, what is the maximum pressure that
may be developed during safety valve blowdown? - ✔✔53 psi
✔✔oils and solids accumulation on the water surface in the boiler can lead to what
condition? - ✔✔foaming
✔✔if the water in a boiler is foaming, the water level indication in the gauge glass will
be? - ✔✔erratic
✔✔a boiler has carried a large slug of water over into the steam. this condition is
called? - ✔✔Priming
✔✔how do steam separators work - ✔✔they cause a sudden change in direction that
throws the water out
✔✔the difference between a check valve and a non-return valve is? - ✔✔a non-return
acts as a cushioning valve that helps prevent chattering
✔✔on a pressure gauge, what is the minimum sized piping that can be used? - ✔✔1/4"
if copper or brass, 1/2" if steel
✔✔when used on a boiler, what is the minimum sized steel pipe that can be used? -
✔✔1/2"
AND ANSWERS SURE A+
✔✔how many sq ft of heating surface are required to produce 1 hp in a HRT firetube
boiler? - ✔✔12
✔✔How many sq ft of heating surface are required to produce 1 hp in a vertical firetube
boiler? - ✔✔14
✔✔how many sq ft of heating surface are required to produce 1 hp in a watertube
boiler? - ✔✔10
✔✔if a high pressure boiler is at its highest operation pressure below MAWP. where will
the pointer on the pressure gague be? - ✔✔12 o' clock
✔✔(LP) a gauge that reads higher than the actual boiler pressure is called a? - ✔✔fast
gauge
✔✔which is true about a boiler pressure mercury switch? - ✔✔must be installed with
pigtail siphon vertically
✔✔(LP) on low pressure boiler, cutout equals:? - ✔✔cut in plus differential
, ✔✔(LP) on a low pressure boiler, the pressure switch is installed: - ✔✔vertical with high
point up
✔✔What is the maximum blowback on a saftey relief valve that is set for 100 psig? -
✔✔4 psig
✔✔if a high pressure boiler operated at 100 psig, what should be the blowback of the
safety valve? - ✔✔not more than 4% and not less than 2 psig in any case
✔✔What is the minimum blowback on a safety valve that pops at 250psi - ✔✔5psi.
✔✔(LP) a data plate on a safety valve on a low pressure boiler is marked 6900lb, this
refers to? - ✔✔lb/hr capacity of the safety valve
✔✔when an accumulation test is performed, the boiler is fired at? - ✔✔Max firing rate
with the main steam stop valve closed
✔✔a safety valve is set on a 50 psi boiler system, what is the maximum pressure that
may be developed during safety valve blowdown? - ✔✔53 psi
✔✔oils and solids accumulation on the water surface in the boiler can lead to what
condition? - ✔✔foaming
✔✔if the water in a boiler is foaming, the water level indication in the gauge glass will
be? - ✔✔erratic
✔✔a boiler has carried a large slug of water over into the steam. this condition is
called? - ✔✔Priming
✔✔how do steam separators work - ✔✔they cause a sudden change in direction that
throws the water out
✔✔the difference between a check valve and a non-return valve is? - ✔✔a non-return
acts as a cushioning valve that helps prevent chattering
✔✔on a pressure gauge, what is the minimum sized piping that can be used? - ✔✔1/4"
if copper or brass, 1/2" if steel
✔✔when used on a boiler, what is the minimum sized steel pipe that can be used? -
✔✔1/2"
