DC BOILER 1ST ACTUAL TEST QUESTIONS AND ANSWERS
GRADED A+
✔✔External feedwater treatment is accomplished by passing water through a ______? -
✔✔zeolite softener
✔✔Moving blading in which the space between blades is smaller at the exhaust than at
the inlet. Energy transfer in reaction blading results in a decrease in steam pressure and
velocity. - ✔✔Reaction blading
✔✔Before lighting off a boiler which has no steam pressure, which procedure would you
follow? - ✔✔Open the superheater vent, the drum air vent, the superheater drains, bring
water level in the drum to sufficient level, and purge furnace.
✔✔In normal practice, to correctly increase the blowdown of a nozzle reaction safety
valve, you should_____ring. - ✔✔Lower the adjusting
✔✔A _______ pump is a positive displacement pump. - ✔✔reciprocating
✔✔Changing a control device to a degree that is proportional to the need is called
_______ . - ✔✔Modulation
✔✔________ air supplied to a furnace controls the rate of combustion - ✔✔Primary
✔✔A scotch marine boiler can be easily recognized because it ______. - ✔✔Is
internally fired
✔✔Name a technique to reduce sulfur dioxide emissions from a coal fired power plant. -
✔✔Precombustion methods
✔✔The tubes in a straight tube water tube boiler are inclined ______. - ✔✔to increase
circulation
✔✔A lead sulfide cell is sensitive to______? - ✔✔Infrared rays
✔✔A collection of control devices and other components necessary for automatic
control of a process or subprocess - ✔✔Control loop
✔✔A _______ should be placed at the discharge of a positive displacement pump. -
✔✔relief valve
, ✔✔A turbine valve designed to prevent the turbine from overheating during a turbine trip
or shutdown by discharging hot, trapped steam to a low pressure area. - ✔✔ventilator
valve
✔✔A(n) ______ gas is a gas that does not change into a liquid when its temperature is
reduced. - ✔✔non-condensable
✔✔The boilers in a boiler installation are consuming a total of 780 gallons of fuel per
hour. The fuel oil storage tank is a vertical cylinder tank that is 18 feet in diameter. The
tank currently contains 14'6" of oil. At the current fuel oil consumption rate, how many
hours will the fuel oil supply last? - ✔✔35.4 hours. V=A x L (3.14 (9x9) x 14.5 x
7.48)/780
✔✔A _____ is a metal brace on a HRT boiler used to attach a wall to steel framework
that supports the wall - ✔✔buckstay
✔✔Find the stress in pounds per square inch on a stably 2.75" in diameter, stays are
pitched 26" x 9". Boiler is operating at 450psi. - ✔✔17,730.
TF= P x A
26 x 9x 450=105,300
P=F/A
105,300/3.14(1.375 x 1.375)
✔✔A bearing consisting of two thrust plates, which surround a turbine shaft and on
thrust runner, which is an integral part of the shaft. Axial rotor movement is prevented
by the thrust plates blocking the movement of the thrust runner. - ✔✔Thrust bearing
✔✔In a three-element feedwater regulating system, ______ are measured. - ✔✔steam
flow, feedwater flow, and water level
✔✔A sectional (sinuous) header boiler is classified as which type? - ✔✔Straight tube
✔✔What is the last valve to be closed before lighting off? - ✔✔Economizer vent
✔✔A ______ boiler is water tube boiler design which three steam and water drums on
the top and a mud drum beneath, interconnected by a large number of water tubes. -
✔✔Sterling
✔✔_______ combustion control ensures that an oxygen-deficient condition is not
encountered, especially during load changes - ✔✔Cross-limiting
✔✔Pumps of the centrifugal type are generally manufactured in either of two general
designs: turbine with a diffuser ring or volute without a diffuser ring. In the volute
GRADED A+
✔✔External feedwater treatment is accomplished by passing water through a ______? -
✔✔zeolite softener
✔✔Moving blading in which the space between blades is smaller at the exhaust than at
the inlet. Energy transfer in reaction blading results in a decrease in steam pressure and
velocity. - ✔✔Reaction blading
✔✔Before lighting off a boiler which has no steam pressure, which procedure would you
follow? - ✔✔Open the superheater vent, the drum air vent, the superheater drains, bring
water level in the drum to sufficient level, and purge furnace.
✔✔In normal practice, to correctly increase the blowdown of a nozzle reaction safety
valve, you should_____ring. - ✔✔Lower the adjusting
✔✔A _______ pump is a positive displacement pump. - ✔✔reciprocating
✔✔Changing a control device to a degree that is proportional to the need is called
_______ . - ✔✔Modulation
✔✔________ air supplied to a furnace controls the rate of combustion - ✔✔Primary
✔✔A scotch marine boiler can be easily recognized because it ______. - ✔✔Is
internally fired
✔✔Name a technique to reduce sulfur dioxide emissions from a coal fired power plant. -
✔✔Precombustion methods
✔✔The tubes in a straight tube water tube boiler are inclined ______. - ✔✔to increase
circulation
✔✔A lead sulfide cell is sensitive to______? - ✔✔Infrared rays
✔✔A collection of control devices and other components necessary for automatic
control of a process or subprocess - ✔✔Control loop
✔✔A _______ should be placed at the discharge of a positive displacement pump. -
✔✔relief valve
, ✔✔A turbine valve designed to prevent the turbine from overheating during a turbine trip
or shutdown by discharging hot, trapped steam to a low pressure area. - ✔✔ventilator
valve
✔✔A(n) ______ gas is a gas that does not change into a liquid when its temperature is
reduced. - ✔✔non-condensable
✔✔The boilers in a boiler installation are consuming a total of 780 gallons of fuel per
hour. The fuel oil storage tank is a vertical cylinder tank that is 18 feet in diameter. The
tank currently contains 14'6" of oil. At the current fuel oil consumption rate, how many
hours will the fuel oil supply last? - ✔✔35.4 hours. V=A x L (3.14 (9x9) x 14.5 x
7.48)/780
✔✔A _____ is a metal brace on a HRT boiler used to attach a wall to steel framework
that supports the wall - ✔✔buckstay
✔✔Find the stress in pounds per square inch on a stably 2.75" in diameter, stays are
pitched 26" x 9". Boiler is operating at 450psi. - ✔✔17,730.
TF= P x A
26 x 9x 450=105,300
P=F/A
105,300/3.14(1.375 x 1.375)
✔✔A bearing consisting of two thrust plates, which surround a turbine shaft and on
thrust runner, which is an integral part of the shaft. Axial rotor movement is prevented
by the thrust plates blocking the movement of the thrust runner. - ✔✔Thrust bearing
✔✔In a three-element feedwater regulating system, ______ are measured. - ✔✔steam
flow, feedwater flow, and water level
✔✔A sectional (sinuous) header boiler is classified as which type? - ✔✔Straight tube
✔✔What is the last valve to be closed before lighting off? - ✔✔Economizer vent
✔✔A ______ boiler is water tube boiler design which three steam and water drums on
the top and a mud drum beneath, interconnected by a large number of water tubes. -
✔✔Sterling
✔✔_______ combustion control ensures that an oxygen-deficient condition is not
encountered, especially during load changes - ✔✔Cross-limiting
✔✔Pumps of the centrifugal type are generally manufactured in either of two general
designs: turbine with a diffuser ring or volute without a diffuser ring. In the volute
