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5thClass Power Engineering Practice Test > 5th Class Power Engineering Book 1 > Flashcards

5th Class Power Engineering Book 1 Flashcards

1
Q

An advantage of a packaged watertube boiler is:
A) No steam space is required
B) It is custom built on site
C) It does not use softened water
D) It is only available with straight tubes
E) A single supplier provides all components

A

E) A single supplier provides all components

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2
Q

The combustion chamber of a serpentine tube watertube boiler:
A) Is surrounded by the tube
B) Is enclosed by a non-insulated metal casing
C) Is located above the tube
D) Has inefficient heat transfer
E) Is located below the tubes

A

E) Is located below the tubes

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3
Q

In comparison to a firetube boiler, a watertube boiler of the same capacity is:
A) More destructive in the event of a pressure part failure
B) Less destructive in the event of a furnace explosion
C) More destructive in the event of a furnace explosion
D) There is no difference between the two types of boiler
E) Less destructive in the event of a pressure part failure

A

E) Less destructive in the event of a pressure part failure

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4
Q

A watertube boiler:
A) Tends to have higher stack temperatures
B) Contains combustion gases within the tubes
C) Has tubes surrounded by combustion gases
D) Is a boiler consisting of tubes within a shell
E) Has tubes surrounded by water

A

C) Has tubes surrounded by combustion gases

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5
Q

In comparison to a firetube boiler, a watertube boiler of the same capacity:
A) Is more efficient
B) Has little difference in expense or efficiency
C) Is less efficient
D) Is less expensive to construct
E) Is more expensive to construct

A

E) Is more expensive to construct

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6
Q 
The upper drum of a packaged watertube steam boiler is referred to as the:
A) Blowoff drum
B) Mud drum
C) Water drum
D) Pressure drum
E) Steam drum
A

E) Steam drum

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7
Q 
Boiler circulation is driven by:
A) Tubing arrangement
B) All of the answers shown
C) Water density difference
D) Heat
E) Formation of steam in the tubes
A

B) All of the answers shown

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8
Q

In comparison to a firetube boiler, a watertube boiler of the same capacity
A) As a higher reserve steam capacity
B) Contains more water
C) Can respond to load changes more quickly
D) Is slow to generate steam pressure
E) There is no difference in steam generating capability

A

C) Can respond to load changes more quickly

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9
Q

In order to keep dissolved solids concentrations within safe limits the packaged tubular steam boiler utilizes a/an:
A) Liquid flow control device
B) Water softener after the condensate receiver
C) Mixing chamber before the heating coil
D) Automatic blowdown
E) Desalinator

A

D) Automatic blowdown

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10
Q

A disadvantage of the watertube or tubular boiler is:
A) Its thermal stresses
B) Water treatment monitoring
C) Its long warm-up period
D) The foundation requirements due to mass
E) Its high maintenance cost

A

B) Water treatment monitoring

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11
Q 
A watertube boiler is a boiler in which:
A) Water passes around the tubes
B) Air passes through the tubes
C) Air passes around the tubes
D) Water passes through the tubes
E) Combustion gases pass through the tubes
A

D) Water passes through the tubes

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12
Q 
A reason for preferring copper tubing in a tubular boiler is:
A) High metal expansion rate
B) Ease of replacement of the tubes
C) Corrosion resistance
D) Low cost
E) Elimination of feedwater treatment
A

C) Corrosion resistance

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13
Q

Question 13
An Advantage of a bent tube boiler is:
A) It doesn’t require a pressure relief valve
B) The boiler requires additional refractory
C) The tubes form baffles and furnace water walls
D) Only one drum is required
E) Tubes are easily replaced compared to straight tube

A

C) The tubes form baffles and furnace water walls

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14
Q 
The bent tube boiler design allows the tubes to create waterwalls that connect:
A) Air pre-heater
B) Economiser
C) Superheater
D) Upper and lower drums
A

D) Upper and lower drums

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15
Q 
In a low pressure serpentine watertube boiler, the serpentine tubes are attached to upper and lower headers with  \_\_\_\_\_ connections.
A) Pressure sealed
B) Threaded
C) Seamless
D) Welded
E) Nozzle
A

B) Threaded

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16
Q 
Three common types of bent tube watertube boilers are:
A) D, O and L
B) B, O and D
C) A, O and D
D) O, D and E
E) B, D and O
A

C) A, O and D

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17
Q 
Feedwater that is fed into the boiler to replace water that has been converted into steam is called:
A) Condensate
B) Reused water
C) Fresh water
D) Softened water
E) Return water
A

D) Softened water

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18
Q

Boiler fireside baffles:
A) Are used with firetube boilers only
B) Will increase the stack temperature
C) Are installed in large boiler furnaces only
D) Direct the flue gases through the boiler furnace
E) Are installed in every boiler furnace

A

D) Direct the flue gases through the boiler furnace

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19
Q 
The copper tube tubular boiler:
A) Is highly susceptible to corrosion
B) Can be gas or oil fired
C) Has the furnace in the upper section
D) Has one part heating surface
E) Is capable of very large capacities
A

B) Can be gas or oil fired

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20
Q 
Two methods of assembling a cast iron sectional boiler are:
A) Clamps and over center locks
B) Short and long tie rods
C) Capscrews and nuts
D) Cable ties and winch
E) Flange bolts and gaskets
A

B) Short and long tie rods

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21
Q 
The fins cast on the flat surface of the sections of a cast iron sectional boiler are used for the purpose of increasing the:
A) Water circulation
B) Water capacity
C) Steam capacity
D) Heat transfer effectiveness
E) Steam output
A

D) Heat transfer effectiveness

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22
Q 
The sections of cast iron boilers are mainly designed to obtain maximum:
A) Water circulation
B) Water space
C) Steam output
D) Heat transfer
E) Steam space
A

D) Heat transfer

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23
Q 
Cast iron boiler section watersides are connected and sealed by:
A)Tapered push nipples
B) Polished surfaces
C) Flanges
D) Threaded connections
E) Pipe plugs
A

A)Tapered push nipples

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24
Q

The capacity of cast iron boilers:
A) Can be changed by increasing gas pressure
B) Can be changed by adding more burners
C) Can be changed by installing larger pumps
D) Can be increased by adding sections
E) Cannot be changed

A

D) Can be increased by adding sections

25
Q 
Front and rear sections of cast iron sectional boilers differ from intermediate sections by having:
A) Push nipples on one side only
B) Bottom supports
C) No gas passages
D) No clean outs
E) No water surface
A

A) Push nipples on one side only

26
Q

High temperature ceramic based rope or gasketing is used during assembly of cast iron sectional boilers to:

A) Seal the exhaust flue
B) Seal around the burners
C) Seal the spaces between sections
D) Seal the intake air vents
E) Seal the water connections
A

C) Seal the spaces between sections

27
Q

Cast iron boilers:
A) Are suitable for high pressures
B) Are relatively susceptible to corrosion
C) Must be located in a building basement
D) Are not used today
E) Are constructed in sections

A

E) Are constructed in sections

28
Q

For Cast Iron Modular boilers the operation of each individual burner is controlled by:
A) The outdoor temperature controller
B) The water pressure controller
C) A step controller which starts modules in sequence
D) Step controller which starts all burners simultaneously
E) A single controller that controls all burners

A

C) A step controller which starts modules in sequence

29
Q

An advantage to using multiple small cast iron sectional boilers in a heating plant is:
A) They don’t require maintenance
B) The thermal efficiency of the plant is considerably improved
C) It is capable of operating at very high pressure
D) The flue gas is corrosive
E) They require higher pressure air

A

B) The thermal efficiency of the plant is considerably improved

30
Q 
Steam is the cooling medium for the upper part of the tubes and the tubesheet in what type of boiler?
A) Vertical firetube
B) Immersion resistance
C) Horizontal firetube
D) Vertical tubeless
E) Circular watertube
A

A) Vertical firetube

31
Q 
A wetback Scotch marine boiler:
A) Uses cast iron sections
B) Is externally fired
C) Has a brick setting
D) Has heating surface surrounding the end section
E) Has a refractory covered end section
A

D) Has heating surface surrounding the end section

32
Q 
The number of combustion gas passes in a Scotch Boiler seldom exceeds four due to:
A) Combustion air pressure
B) Chimney height
C) Condensation problems
D) Stack diameter
E) Breeching leak
A

C) Condensation problems

33
Q 
The products of combustion leaving the furnace are referred to as combustion gases or:
A) Excess gases
B) Noxious gases
C) Flue gases
D) Natural gases
E) Stack gases
A

C) Flue gases

34
Q 
A boiler which is built ready for installation is the:
A) Firebox boiler
B) Scotch marine boiler
C) Locomotive boiler
D) Packaged boiler
E) HRT boiler
A

D) Packaged boiler

35
Q

A horizontal return tubular boiler is:

  1. A two pass boiler
  2. A watertube boiler
  3. Externally fired
  4. Constructed entirely of mild steel
A) 1, 3
B) 2, 3, 4
C) 1, 3, 4
D) 1, 2, 3
E) 2, 4
A

A) 1, 3

36
Q 
A steel plate vertical firetube unit is divided into two sections and the upper part is often called the:
A) Expansion tank
B) Combustion chamber
C) Reversing section
D) Heat exchanger
E) Flue gas collector section
A

D) Heat exchanger

37
Q

When comparing vertical and horizontal firetube boilers, a horizontal firetube boiler:
A) Requires more feedwater for a given size
B) Needs more air
C) Requires more space for a given capacity
D) Requires less overhead space for a given capacity
E) Is less reliable

A

D) Requires less overhead space for a given capacity

38
Q 
Firetube boilers have their tubes fixed into flat steel plates, otherwise known as:
A) Drums
B) Flues
C) Shells
D) Tubesheets
E) Headers
A

D) Tubesheets

39
Q 
On older boilers, the masonry work that tended to surround the furnace was termed the:
A) Setting of the boiler
B) Boiler firebox
C) Boiler casing
D) Boiler masonry
E) Wind box
A

A) Setting of the boiler

40
Q

A firetube boiler is a boiler in which:
A) Air passes through the tubes
B) Air passes around the tubes
C) Combustion gases pass through the tubes
D) Combustion gases pass around the tubes
E) Water passes through the tubes

A

C) Combustion gases pass through the tubes

41
Q 
A \_\_\_\_\_ is a water filled section which surrounds the firebox in locomotive boilers.
A) Steam dome
B) Crown sheet
C) Buckstay
D) Water leg
E) Boiler drum
A

D) Water leg

42
Q 
The maximum operating temperature of a hot water heating boiler is:
A) 200ºC
B) 160ºC
C) 100ºC
D) 121ºC
E) 120ºC
A

D) 121ºC

43
Q 
A Scotch marine boiler:
A) Has an internal furnace
B) Cannot be fired on coal
C) Is externally fired
D) Is not used in marine applications
E) Is single pass
A

A) Has an internal furnace

44
Q

Firetube boilers:
A) Have very specific design pressures to meet customer needs
B) Are not very rugged relative to portability
C) Have maintenance access difficulties
D) Require special foundations or footings
E) Require relatively small floor space

A

E) Require relatively small floor space

45
Q

A hot water boiler is not considered a heating boiler unless it exceeds:

  1. A capacity of 454 L (120gal)
  2. 5.1 cm (2 in) inlet
  3. A temperature of 99°C (210°F)
  4. An energy input of 58.6 kW
  5. A pressure of 15 psi
A) 1, 3, 4
B) 3, 4, 5
C) 2, 3, 4
D) 1, 3, 5
E) 1, 2, 3
A

A) 1, 3, 4

46
Q

An internally fired boiler:
A) Must be a watertube type
B) Requires a setting
C) Has the furnace surrounded by water
D) Utilizes a high amount of refractory and/or firebrick
E) Is less efficient than an externally fired unit

A

C) Has the furnace surrounded by water

47
Q 
The first boiler to have an internal furnace was the:
A) Packaged boiler
B) Scotch Boiler
C)Watertube boiler
D) Longitudinal drum firetube boiler
E) HRT boiler
A

B) Scotch Boiler

48
Q 
The locomotive boiler type is a:
A) Three pass internal furnace
B) Single pass internal furnace
C) Wetback boiler
D) Single pass external furnace
E) Three pass external furnace
A

B) Single pass internal furnace

keyword; INTERNAL for Locomotive boiler.

49
Q

When comparing a watertube and firetube boiler, a firetube boiler:
A) Requires more fuel to respond to load changes
B) Has less reserve steaming capacity
C) Is slower to respond to load changes
D) Is more difficult to maintain water level in when the load changes
E) Has a quicker load response

A

E) Has a quicker load response

50
Q

An immersion type of electric boiler:
A) Does everything shown here
B) Passes current through the water
C) Generates heat utilizing a bundle of heating elements
D) Uses pressure to directly regulate energy consumption
E) Depends on water level to regulate steam production

A

C) Generates heat utilizing a bundle of heating elements

51
Q

In an electrode type of electric boiler:
A) Current decreases as pressure drops
B) More steam is generated when the generating zone level drops
C) As generating zone water level decreases, current increases
D) Current increases as the generating zone level drops
E) Electrical current decreases as pressure goes up

A

E) Electrical current decreases as pressure goes up

52
Q

Electrode type boilers:
A) Require electrodes to be totally immersed in water
B) Self regulate steam pressure
C) Require microprocessor control
D) Require complex control systems
E) Require external resistance for control

A

B) Self regulate steam pressure

53
Q

Water level in the generating zone of an electrode type boiler:
A) Is maintained by means of a feedwater regulator
B) Is governed by feedwater flow
C) Has no effect on pressure
D) Is governed by load fluctuations
E) Is constant

A

B) Is governed by feedwater flow

54
Q

A rise of steam pressure in the generating zone of an electrode boiler leads to:
A) A drop in water level in the generating zone
B) More steam output
C) More current demand
D) A requirement of more feedwater
E) A rise in water level

A

A) A drop in water level in the generating zone

55
Q

Immersion boiler tube bundles:
A) Can be removed from the unit for maintenance purposes
B) Act to conduct current through the water
C) Cannot be used to regulate steaming capacity
D) Have very low electrical resistance
E) Operate at only one voltage

A

A) Can be removed from the unit for maintenance purposes

56
Q

Electric boilers:
A) Tend not to be very compact
B) Are not as safe as other boilers
C) Have energy conversion efficiencies close to 100%
D) Require sootblowers when fuel is coal
E) Require tall stacks for pollution dispersement

A

C) Have energy conversion efficiencies close to 100%

57
Q

In an electrode type electric boiler the generating zone:
A) Is less efficient than an immersion type
B) Generates more steam as water level falls
C) Uses more current when water level rises
D) Generates more steam as water level rises
E) Is less efficient when water level rises

A

D) Generates more steam as water level rises

58
Q

Due to the effect of high temperature on the electrodes, Electric boilers are:
A) Operated at pressure up to 2100 psi
B) Able to withstand any pressure
C) Operated at lower pressures below 2100 kPa
D) Limited to 1100 kPa
E) Required to be used only for large scale industrial processes

A

C) Operated at lower pressures below 2100 kPa

5thClass Power Engineering Practice Test (3 decks)

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