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Machinist Mate 3 & 2 > Test 10: Boilers > Flashcards

Test 10: Boilers Flashcards

1
Q

What chapter of the NSTM will you find the chapter on boilers?

A

Chapter 221

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2
Q

To what publication should you refer to find your ships boiler full-power capacity?

A

Manufacturers technical manual

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3
Q

Boiler overload is specified in the design of the boiler. Depending on its installation, boiler overload capacity is given either as the firing rate of the…

A

Steaming rate

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4
Q

The boiler overload capacity is usually what percentage of boiler full-power capacity?

A

120%

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5
Q

What term describes the actual pressure in the stream drum at any given time?

A

Steam drum pressure

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6
Q

The constant pressure at which the boiler is being operated is known as the…

A

Operating pressure

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7
Q

Which of the following statements defines the design pressure of a boiler?

A

The design pressure is specified by the boiler manufacturer as a criteria for boiler design.

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8
Q

The amount of Btu per pound of fuel absorbed by the water and steam divided by the Btu per pound of fuel is known as…

A

Boiler efficiency

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9
Q

If you were to state the efficiency of a boiler would you use:
A: 90%
B: 90: 1
C: 90 is equal to 1

A

A: 90%

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10
Q

The times during which the boiler has fires lighted for raising steam and the time during which it is generating steam is known as what?

A

Steaming hours

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11
Q

The total heating surface equals the sum of the generating, superheater, and economizer surfaces. You measure the total heating surface of a steam-generating unit on the side that is exposed to the…

A

Gases of combustion

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12
Q

At the maximum steam drum pressure point, what boiler safety valves lifts?

A

The first

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13
Q

Minimum steam drum pressure is usually what percentage of the boiler operating pressure?

A

85%

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14
Q

Naval boilers can be classified in several way. One way is to divide them into classes auxiliary boilers and what other class?

A

Propulsion boilers

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15
Q

Boilers can be classified according to their location relative to the fire and water spaces. In this type of classification, what class of boiler pertains to all propulsion spaces?

A

Water tube boilers

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16
Q

Boilers whose tubes slope steeply from the steam drum to the water drum will have what type of circulation?

A

Accelerated natural circulation

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17
Q

What factor determines the classification of natural-circulation water-tube boilers as either a header- or drum-type boiler?

A

The arrangement of the steam and water spaces

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18
Q

Name 2 statements for the description of a header?

A

It is a type of collection point and type of manifold

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19
Q

What is the only distinction between a header and a drum?

A

Size

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20
Q

For what reason are single furnace boilers known as D-type boilers?

A

The tubes form a shape that looks like the letter D

21
Q

Because of the shape or arrangement of its tubes, a double furnace boiler is known as what type of boiler?

A

M-type

22
Q

On most boilers superheater tubes are protected from radiant heat by what means?

A

Water screen tubes, which absorb the intense heat of the furnace

23
Q

To be considered a high-pressure boiler, it must be operated at what minimum pressure?

A

751 PSI

24
Q

What is the purpose of the steam drum located at the top of the boiler?

A

To receive feedwater and as a place where saturated steam is accumulated

25
Q

On a steam drum, tube sheets are required to be thicker than the wrapper sheet for what reason?

A

To ensure adequate strength after the holes for the generating tubes are drilled.

26
Q

The steam drum is located on the top of the boiler. Where are the water drums and headers located?

A

At the bottom of the boiler.

27
Q

Which of the following are types of generating and circulating tubes?

A

Main generating tube tanks
Water wall and water screen tubes
Downcomers

28
Q

What is the function of water wall tubes?

A

To protect the furnace refractories

29
Q

A modern boiler contains approximately what number of tubes?

A

Between 1,000 and 2,000 tubes

30
Q

In relation to the boiler, tube rows run in what sequence?

A

From the front to the rear of a boiler.

31
Q

Which of the following is a source of information you can use to identify boiler tubes?

A

Boiler tube renewal sheet
Manufacturers’s tech manual
Boiler plans

32
Q

H-shaped
T-shaped
U-shaped
W-shaped

Which one is used with convection-type vertical superheaters?

A

U-shaped

33
Q

Used with convection type horizontal syperheaters

H, T, U, or W- shaped?

A

W-shaped

34
Q

What boiler component uses heat from combustion gases to heat the feedwater before it enters the steam drum?

A

Econimizer

35
Q

What is the purpose of the projections on the outer tube surface of an economizer?

A

To extend the heat transfer area of the tube

36
Q

What are some factors that affect refractory service life?

A

Shock and vibration
Panting
Sustained high furnace temperature

37
Q

To withstand shock and vibration, all areas of refractory must be anchored or held in place by one of three methods-by anchor strips, boiler tubes, and by what other method?

A

Brick bolts

38
Q

Which of the following problems contributes to undue panting of a boiler?

A

Poor air-oil intermixture
Deficiency of air
Excessive oil temperature

39
Q

In D-type burners, used in superheater cavities

A

Grade B Firebrick

40
Q

Can only be used with specific burner types

A

Burner tile

41
Q

It’s advantage is the speed and economy of insulation because handcuffing insulation or brick bolts is eliminated.

A

Castable insulation

42
Q

Used primarily on studded tubes in divided furnace boilers.

A

Plastic Chrome Ore

43
Q

Used as an insulation block and the casing in some boilers.

A

Insulating cement

44
Q

When used, castable firelay refractory should be air-cured for what minimum period of time before it is baked out?

A

2 days

45
Q

Which of the following types of refractory mortar develop(s) its strength after drying without being heated?

A

Class 1 & 2

46
Q

Baffle tile is made from what material?

A

Silicon carbide

47
Q

Styrofoam expansion joints must be cut to what uniform thickness?

A

1/5 inch

48
Q

The majority of propulsion boilers have what total number of furnaces?

A

Three

49
Q

What steam drum fitting disperses feedwater evenly in the steam drum?

A

Internal feed pipe

Machinist Mate 3 & 2 (6 decks)

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