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PIPE > Chapter 16 ( Machine Foundation & Chimney ) > Flashcards

Chapter 16 ( Machine Foundation & Chimney ) Flashcards

1
Q

Foundation are preferably built of concrete in the proportion of what measure of Portland cement: sand : crushee stones?

A

1 : 2 : 4

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2
Q

For design stability, the center of gravity of the total combined engine, drive equipment and foundation should be kept ______

A

below the foundation top

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3
Q

The machine foundation must have a factor safety of ___

A

5

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4
Q

Diesel engine foundation safe soil bearing pressure is:

A

4,890 kg/cm²

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5
Q

Anchor bolts in a machine foundation should

A

30

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6
Q

As a good practical rule, the foundation depth may be taken as how many times of the engine stroke?

A

3.2 to 4.2

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7
Q

To secure the belts embedded within the foundation, the distance of the edges of the foundation from the bedplate must be ______

A

120 mm to 300mm

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8
Q

Weight of the machine foundation is how many time the weight of the engine

A

3 to 5 times

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9
Q

To eliminate transmission of vibration, the foundation should be isolated from floor slabs or building footings at least how many mm around its perimeter?

A

25 mm

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10
Q

Minimum vertical distance from the floor to the top edge of foundation

A

120 mm

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11
Q

There shall be no foundation bolts less than ____

A

12 mm in diameter

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12
Q

Weight of steel bar reinforcements should be how many times the weight of the foundation

A

1/2 % to 1%

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13
Q

Concrete foundation should have steel bar reinforcements placed vertically and horizontally to avoid _____

A

Thermal Cracking

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14
Q

Foundations bolt length should be at least how many times the anchor bolt diameter?

A

18 times

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15
Q

Foundation bolts of specified size should be used and surrounded by a pipe sleeve with an inside diameter of at least how many times the diameter of the anchor bolt?

A

3

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16
Q

For a diesel engine’s foundation, in pouring a concrete mixture, it should be poured:

A

one time

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17
Q

For foundations of steam turbine, the concrete mixture should be ____

A

1 : 2 : 4

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18
Q

The steam turbine foundation should be designed to support the machine load plus how many percent for impact, condenser loaf, floor loads and dead loads?

A

25 %

19
Q

Which of the following draft rely on the stack effect to draw off combustion gases?

A

Natural Draft

20
Q

Fans located before the furnace that are used to supply air for burning.

A

Forced Draft

21
Q

Forced draft fans run at relatively high speeds in what range:

A

1200 - 1800 RPM

22
Q

Chimneys that rely on natural draft are referred as:

A

Gravity Chimney

23
Q

Force draft fans create a positive pressure of:

A

0.5 to 2.5 kPa

24
Q

Fans that are used to draw combustion products through the furnace bed, stack and pollution control system injecting air into the stack after combustion

A

Induced Draft

25
Q

The term used when the static pressure is equal to the atmospheric pressure

A

Balanced Draft

26
Q

In order to keep combustion products inside the combustion chamber and stack system, balanced draft system may actually operate with a slight _____

A

negative pressure

27
Q

the static pressure drop due to friction through the boiler

A

draft loss

28
Q

The difference between the theoretical draft and the draft loss

A

Available draft

29
Q

In a balanced system, the available draft is _____

A

Zero

30
Q

The total pressure supplied by the fan at maximum operating conditions

A

net rating or fan boost

31
Q

Generally, The higher the chimney, the ______

A

the greater the stack effect

32
Q

Modern stacks are seldom built higher than ____

A

60 m

33
Q

Most stacks are built of height less than _____

A

30 m

34
Q

The average flue gas temperature is_____

A

the temperature halfway up the stack

35
Q

Coefficient of velocity is approximately:

A

0.30 to 0.50

36
Q

For realistic problems, the achievable stack effect probably should be considered to be:

A

80% of the ideal

37
Q

Guyed stacks seldom exceed:

A

1.83 m in diameter

38
Q

The angle between the stack and the guy wire is :

A

60 degrees

39
Q

Guyed stacks HEIGHT seldom exceed:

A

30.48 m

40
Q

Maximum unit pressure of turbine and generator on the reinforced concrete

A

17.62 kg/cm²

41
Q

In guyed steel stacks, the angle between wires in a set of three is:

A

120 degrees

42
Q

Guys are usually applied in how many sets ?

A

1 to 3

43
Q

The empirical coefficient (e) in machine foundation if not given is ____

A

0.11

44
Q

The term suction units is used with

A

Induced Draft

PIPE (17 decks)

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