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4th Six Months > Reading Blueprints > Flashcards

Reading Blueprints Flashcards

1
Q

What designation is given for the size of sheet the drawing has been made to

A

Letters

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2
Q

What can you find in the approval block?

A

signatures or initials of persons involved in checking/approving drawings for the first draft, first entry, and everytime they approve worl

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3
Q

What is tolerance in regards to blueprints?

A

Difference between the highest and lowest allowable limits for a dimension between parts.

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4
Q

How is a centerline drawn in drafting diagrams?

A

With a thin line interrupted with short dashes. locates centers of round features

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5
Q

What is a sectioned drawing?

A

It shows a part that shows as if it has been cut in half to show inner working. The cut surfaces are indicated with crosshatched lines.

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6
Q

Describe a pulley.

A

Continuous lever with equal arms

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7
Q

What is the first number in thread specifications?

A

It is the nominal size ( approximate overall diameter of the threads of the bolt.

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8
Q

What is a class 1 fit in regards to thread fit.

A

A class 1 fit is the loosest fitting threads there are with class 3 being the tightest.

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9
Q

What are the letter designations in thread specifications?

A

A- external threads

B-internal threads ^must be indicated in a drawing.

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10
Q

What is RH and LH in regards to thread specification>

A

RH-clockwise
LH-counter-clockwise
They indicate the rotation for screw advancement. LH must be indicated in a drawing.

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11
Q

A welding symbol on a blueprint is indicated by what symbol?

A

an arrow pointing to the location of the weld.

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12
Q

What type of pulley is needed when using a V belt?

A

A grooved pulley also called a sheave.

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13
Q

What is a compound rest on a lathe?

A

It is the base for mounting tool holders on the lathe. It is located on the saddle of the lathe.

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14
Q

What is an exploded view diagram?

A

It shows all the internal parts of the mechanism but shows them seperated from one another

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15
Q

What are the different parts of compound rest?

A

There are two. The lower part is called the compound rest symbol. The upper is the rest top.

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16
Q

What type of drawing shows a three dimensional object on a two dimensional plane?

A

Orthographic projection.

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17
Q

To avoid confusion, a drafter may draw the shafts in a gear train as though they were in a single .

A

plane

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18
Q

On sheet metal drawing of ducts, the first measurement of a duct is……

A

The measurement of the side shown in the drawing.

19
Q

How is a supply outlet cieling vent shown on a duct drawing?

A

It is a square or rectangle with arrows coming out from it on all sides.

20
Q

A directs the air and spreads it evenly into the space.

A

a diffuser.

21
Q

What is radial development?

A

The lines extnding from a single point on a cone, pyramid or other shape that has a constant taper.

22
Q

How are fire bricks indicated on building drawings?

A

diagonal lines with short vertical lines coming from the top.

23
Q

Describe floor plan layouts.

A

these layouts show the arrangements of the different pieces of machinery, offices, and store rooms

24
Q

Describe structural drawings.

A

drawings of the framework, floors, and foundations of the plant

25
Q

Describe flow diagrams.

A

flow diagrams can be either floor plans or elevation drawings. They do not include any details of the equipment

26
Q

Describe pascal’s law.

A

In any fluid/liquid/gas the pressure at any point acts equally in all directions

27
Q

If equal pressure acts on both the rod side and the blank side of a piston, which side receives the greater force?

A

the blank side

28
Q

What is the function of the accumulator in a hydraulic system?

A

to prevent rapid pressure change

29
Q

Why are galvanized iron pipes often threaded joints?

A

Because the joints are strong, easy to make on the job, and easy to assemble

30
Q

The threads for screwed joints are special because….

A

they are tapered. The taper forces the two sections tighter together as you assemble the joint

31
Q

What type of joints are used in large diameter industrial piping that carries fluids under pressure or at high temperature?

A

flanged joints

32
Q

Is a single line drawing very realistic?

A

No it is not. It uses symbols to show the fittings and the sizes of parts.

33
Q

What happens when two different metals make electrical contact with each other?

A

An electro-chemical reaction occurs. This reaction is called a galvanic reaction. One metal undergoes corrosion while the other is protected.

34
Q

Describe circuit diagrams.

A

A circuit diagram shows how a single circuit distributes electricity to various loads.

35
Q

What kind of electrical drawing shows the distribution of electricity to all buildings of a plant?

A

plot plan

36
Q

A circulating refrigeration fluid that changes back and forth from a liquid to a gas is called a…

A

refrigerant

37
Q

Which device controls the flow of refrigerant from high pressure to low pressure?

A

expansion valve

38
Q

An indirect system differs from a direct system in that it requires a…..

A

heat exchanger to cool the air.

39
Q

The two kinds of operating control systems in HVAC

A

electric and low pressure air

40
Q

Refrigerant piping drawings are usually…

A

single line drawings

41
Q

What should a good sketch do?

A

It should communicate clearly.

42
Q

A pictorial sketch shows….

A

an object in 3D much as it appears to the eye.

43
Q

What does the word “isometric” mean?

A

It means equal measure

44
Q

Parts farther from the front appear smaller in a

sketch.

A

Perspective

4th Six Months (7 decks)

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