DC BOILER EXAM ACTUAL EXAM COMPLETE 241 QUESTIONS AND
CORRECT DETAILED ANSWERS VERIFIED ANSWERS ALREADY
GRADED A ALREADY GRADED A
1. Because of the large volume of water, the boiler type most likely to cause a boiler
explosion is a ___ boiler.: firetube
2. The part of a boiler with the heat and gases of combustion on one side and water on
the other side is known as the ___ surface.: heating
3. ___ is the pressure at which the density of water and steam are the same.: Critical
pressure
4. An electric boiler produces heat using electrodes or ___.: resistance coils
5. Boiler horsepower (BHP) is the amount of energy equal to the evaporation of ___
lb/hr of water from and at a feedwater temperature of 212°F.: 34.5
6. A high pressure steam boiler operates at a steam pressure of more than ___ psi.: 15
7. A ___ results in a higher boiling point for water in a boiler.: higher steam pressure
8. A(n) ___ is a boiler that uses heat recovered from a hot gas stream, such as hot
exhaust gases from a kiln or from a gas turbine.: heat recovery steam generator (HRSG)
9. A ___ is the lowest part of the water side of a watertube boiler.: mud drum 10. By
increasing the number of passes and the number of fire tubes, water can absorb more heat
and ___ increases.: thermal efficiency
11. The steam drum of water tube boilers is dished (concave) to eliminate the need for ___.:
stays
12. ___ stress occurs when two forces of equal intensity act from opposite directions and
push toward the center of an object.: Compressive
13. ___ are used to direct the gases of combustion so that they come in close contact with
the boiler heating surface.: Baffles
14. A ___ is a set of tubes that is placed in the furnace area of water tube boilers and used
to increase the heating surface of boilers and the service life of refractory.: waterwall
15. A ___ boiler comes completely assembled, with its own pressure vessel, burner, draft
fans, and fuel train.: package
16. Boiler plates and stays are subjected to ___ stress.: tensile
17. ___ are used to prevent bulging in boilers.: Through stays
18. A ___ converts the energy from the expansion of high-pressure steam into the
mechanical energy of rotation.: turbine
19. A ___ is a device that converts mechanical energy into electrical energy.: generator
20. Cogeneration is the process of ___ and then using the waste heat for heating buildings,
providing process heat, or further electrical generation.: generating electricity
21 Food processing plants use steam for ___, pasteurization, and sterilization.: cooking
22. ___ is the production of electricity as a result of a conductor passing through a
magnetic field.: Electromagnetic induction
, .
23. ___ generators are the most common generators used to produce electrical power.:
AC
24. ___ is often used as a prime mover that is used to rotate turbines to generate
electricity.: High-pressure steam
25. Exhaust gases from engines and turbines pass through a heat exchanger to produce
hot water or steam for use in plant heating or processes in ___ plants.: combined heat and
power (CHP) 26. CHAPTER 2:
27. ___ are used for steam loads that require dry steam.: Superheaters
28. A ___ can be installed at the point of use to reduce the steam pressure to the pressure
needed for the load.: pressure-reducing station
29. A ___ is used to send condensate back to the condensate return.: steam trap
30. Feedwater flows into a boiler to be heated by ___.: gases of combustion
31. 31. Each steam load device has one or more ___ valves that allow the load device to be
taken out of service for repairs.: isolation
32. 32. It takes ___ lb of water to produce 1 lb of steam.: 1.0
33. A deaerator tank is located above the feedwater pumps so that the water is supplied to
the pumps ___.: at a positive pressure
34. In the deaerator tank, noncondensable gases are separated and directed to the
atmosphere through a ___.: vent
35. Feedwater can be pumped through a ___ where it is heated to a relatively high
temperature by the gases of combustion.: closed feedwater heater
36. In the deaerator tank, a ___ to add makeup water to the deaerator tank to compensate
for the condensate lost.: float opens a feed valve
37. A shutoff valve is used when ___.: making repairs
38. On larger watertube boilers, a(n) ___ can heat the feedwater by using gases of
combustion before the feedwater enters the boiler.: economizer
39. Once fuel oil reaches the burner, it is the function of the burner to ___ the oil so it can
mix with air and burn.: atomize
40. In a low-pressure gas system, the zero gas governor reduces the pressure of the gas to
___ psi.: 0
41. In a low-pressure gas system, the air and gas mixture in the furnace is ignited by the
___.: pilot
42. Modern coal plants use ___ coal that is blown into the combustion chamber
where it burns in suspension.: pulverized
43. ___ valves are typically slow-opening, fast-closing, hydraulic-electric valves and should
have an internal proof-of-closure switch.: Safety shutoff
44. A(n) ___ is used to clean fuel oil before it goes to a burner.: strainer
45. Stop valves isolate a tank when ___.: it is not in use
46. Most steam plants that use No. ___ fuel oil have two tanks.: 6
CORRECT DETAILED ANSWERS VERIFIED ANSWERS ALREADY
GRADED A ALREADY GRADED A
1. Because of the large volume of water, the boiler type most likely to cause a boiler
explosion is a ___ boiler.: firetube
2. The part of a boiler with the heat and gases of combustion on one side and water on
the other side is known as the ___ surface.: heating
3. ___ is the pressure at which the density of water and steam are the same.: Critical
pressure
4. An electric boiler produces heat using electrodes or ___.: resistance coils
5. Boiler horsepower (BHP) is the amount of energy equal to the evaporation of ___
lb/hr of water from and at a feedwater temperature of 212°F.: 34.5
6. A high pressure steam boiler operates at a steam pressure of more than ___ psi.: 15
7. A ___ results in a higher boiling point for water in a boiler.: higher steam pressure
8. A(n) ___ is a boiler that uses heat recovered from a hot gas stream, such as hot
exhaust gases from a kiln or from a gas turbine.: heat recovery steam generator (HRSG)
9. A ___ is the lowest part of the water side of a watertube boiler.: mud drum 10. By
increasing the number of passes and the number of fire tubes, water can absorb more heat
and ___ increases.: thermal efficiency
11. The steam drum of water tube boilers is dished (concave) to eliminate the need for ___.:
stays
12. ___ stress occurs when two forces of equal intensity act from opposite directions and
push toward the center of an object.: Compressive
13. ___ are used to direct the gases of combustion so that they come in close contact with
the boiler heating surface.: Baffles
14. A ___ is a set of tubes that is placed in the furnace area of water tube boilers and used
to increase the heating surface of boilers and the service life of refractory.: waterwall
15. A ___ boiler comes completely assembled, with its own pressure vessel, burner, draft
fans, and fuel train.: package
16. Boiler plates and stays are subjected to ___ stress.: tensile
17. ___ are used to prevent bulging in boilers.: Through stays
18. A ___ converts the energy from the expansion of high-pressure steam into the
mechanical energy of rotation.: turbine
19. A ___ is a device that converts mechanical energy into electrical energy.: generator
20. Cogeneration is the process of ___ and then using the waste heat for heating buildings,
providing process heat, or further electrical generation.: generating electricity
21 Food processing plants use steam for ___, pasteurization, and sterilization.: cooking
22. ___ is the production of electricity as a result of a conductor passing through a
magnetic field.: Electromagnetic induction
, .
23. ___ generators are the most common generators used to produce electrical power.:
AC
24. ___ is often used as a prime mover that is used to rotate turbines to generate
electricity.: High-pressure steam
25. Exhaust gases from engines and turbines pass through a heat exchanger to produce
hot water or steam for use in plant heating or processes in ___ plants.: combined heat and
power (CHP) 26. CHAPTER 2:
27. ___ are used for steam loads that require dry steam.: Superheaters
28. A ___ can be installed at the point of use to reduce the steam pressure to the pressure
needed for the load.: pressure-reducing station
29. A ___ is used to send condensate back to the condensate return.: steam trap
30. Feedwater flows into a boiler to be heated by ___.: gases of combustion
31. 31. Each steam load device has one or more ___ valves that allow the load device to be
taken out of service for repairs.: isolation
32. 32. It takes ___ lb of water to produce 1 lb of steam.: 1.0
33. A deaerator tank is located above the feedwater pumps so that the water is supplied to
the pumps ___.: at a positive pressure
34. In the deaerator tank, noncondensable gases are separated and directed to the
atmosphere through a ___.: vent
35. Feedwater can be pumped through a ___ where it is heated to a relatively high
temperature by the gases of combustion.: closed feedwater heater
36. In the deaerator tank, a ___ to add makeup water to the deaerator tank to compensate
for the condensate lost.: float opens a feed valve
37. A shutoff valve is used when ___.: making repairs
38. On larger watertube boilers, a(n) ___ can heat the feedwater by using gases of
combustion before the feedwater enters the boiler.: economizer
39. Once fuel oil reaches the burner, it is the function of the burner to ___ the oil so it can
mix with air and burn.: atomize
40. In a low-pressure gas system, the zero gas governor reduces the pressure of the gas to
___ psi.: 0
41. In a low-pressure gas system, the air and gas mixture in the furnace is ignited by the
___.: pilot
42. Modern coal plants use ___ coal that is blown into the combustion chamber
where it burns in suspension.: pulverized
43. ___ valves are typically slow-opening, fast-closing, hydraulic-electric valves and should
have an internal proof-of-closure switch.: Safety shutoff
44. A(n) ___ is used to clean fuel oil before it goes to a burner.: strainer
45. Stop valves isolate a tank when ___.: it is not in use
46. Most steam plants that use No. ___ fuel oil have two tanks.: 6
