BLACK SEAL HIGH PRESSURE ACTUAL FINAL
EXAM QUESTIONS AND ANSWERS SURE A+
✔✔Furnace explosions can best be avoided by: - ✔✔purging the furnace after any
flame interruption
✔✔What type of draft system is used to overcome resistance on power boilers
equipped with an economizer? - ✔✔an induced draft system
✔✔What is the Btu content of natural gas? - ✔✔100,000 Btu/therm
✔✔The term viscosity can best be defined as: - ✔✔the point at which oil starts to flow
✔✔A gradual increase in the stack temperature could indicate what condition in a
boiler? - ✔✔heating surface fouling
✔✔In the ignition system on an oil burner, what causes the spark to jump the gap and
ignite the fuel? - ✔✔a high voltage spark of 10,000V DC produced from the transformer,
jumps the gap between the electrode tips.
✔✔What are the three types of draft used in power plants? - ✔✔natural, forced, and
induced
, ✔✔What would a stack gas reading of fair to good combustion look like? - ✔✔low
oxygen and carbon monoxide, high carbon dioxide
✔✔When a discharge valve is opened to the atmosphere, the pressure on the upstream
side of the valve will: - ✔✔decrease, and the pressure on the downstream side will
remain the same.
✔✔By N.J.A.C. 12:90 rules, what is the minimum thickness allowed for atmospheric
type blowdown tank? - ✔✔5/16 inch
✔✔What would one standard atmosphere at 14.7 psi be equivalent to in feet of water? -
✔✔34 feet
✔✔What is a generally accepted method for locally verifying that a manual valve is fully
closed in a depressurized static piping system? - ✔✔Attempt to turn the valve hand
wheel in the fully closed direction and verify no movement.
✔✔The purpose of backseating a manual valve in an operating system is to: -
✔✔isolate system pressure from the packing stuffing box to minimize packing leakage.
✔✔What water treatment chemical is used to control alkalinity in boiler feedwater? -
✔✔caustic soda
✔✔In a cooling water system when comparing a 3-inch gate valve to a 3-inch globe
valve used for the same application in the process, what will happen if both valves were
fully open? - ✔✔The globe valve would produce the larger head loss and the smaller
flow rate.
✔✔What chemical should be added to boiler feedwater to prevent oxidation of the boiler
drum and tubes? - ✔✔sodium sulfite
✔✔Where is caustic embrittlement most likely to occur? - ✔✔on a riveted joint below the
water line
✔✔What is the proper procedure for returning a gauge glass to service, after installing a
new glass? - ✔✔open the drain and crack open the top valve
✔✔On a steam boiler in order to prevent the generation of steam greater than the
maximum working pressure requires activation of what device? - ✔✔The high steam
pressure limit control
EXAM QUESTIONS AND ANSWERS SURE A+
✔✔Furnace explosions can best be avoided by: - ✔✔purging the furnace after any
flame interruption
✔✔What type of draft system is used to overcome resistance on power boilers
equipped with an economizer? - ✔✔an induced draft system
✔✔What is the Btu content of natural gas? - ✔✔100,000 Btu/therm
✔✔The term viscosity can best be defined as: - ✔✔the point at which oil starts to flow
✔✔A gradual increase in the stack temperature could indicate what condition in a
boiler? - ✔✔heating surface fouling
✔✔In the ignition system on an oil burner, what causes the spark to jump the gap and
ignite the fuel? - ✔✔a high voltage spark of 10,000V DC produced from the transformer,
jumps the gap between the electrode tips.
✔✔What are the three types of draft used in power plants? - ✔✔natural, forced, and
induced
, ✔✔What would a stack gas reading of fair to good combustion look like? - ✔✔low
oxygen and carbon monoxide, high carbon dioxide
✔✔When a discharge valve is opened to the atmosphere, the pressure on the upstream
side of the valve will: - ✔✔decrease, and the pressure on the downstream side will
remain the same.
✔✔By N.J.A.C. 12:90 rules, what is the minimum thickness allowed for atmospheric
type blowdown tank? - ✔✔5/16 inch
✔✔What would one standard atmosphere at 14.7 psi be equivalent to in feet of water? -
✔✔34 feet
✔✔What is a generally accepted method for locally verifying that a manual valve is fully
closed in a depressurized static piping system? - ✔✔Attempt to turn the valve hand
wheel in the fully closed direction and verify no movement.
✔✔The purpose of backseating a manual valve in an operating system is to: -
✔✔isolate system pressure from the packing stuffing box to minimize packing leakage.
✔✔What water treatment chemical is used to control alkalinity in boiler feedwater? -
✔✔caustic soda
✔✔In a cooling water system when comparing a 3-inch gate valve to a 3-inch globe
valve used for the same application in the process, what will happen if both valves were
fully open? - ✔✔The globe valve would produce the larger head loss and the smaller
flow rate.
✔✔What chemical should be added to boiler feedwater to prevent oxidation of the boiler
drum and tubes? - ✔✔sodium sulfite
✔✔Where is caustic embrittlement most likely to occur? - ✔✔on a riveted joint below the
water line
✔✔What is the proper procedure for returning a gauge glass to service, after installing a
new glass? - ✔✔open the drain and crack open the top valve
✔✔On a steam boiler in order to prevent the generation of steam greater than the
maximum working pressure requires activation of what device? - ✔✔The high steam
pressure limit control
