Tpc 101 reading blueprints Flashcards
How can you determine the size of a blueprint?
There is a section that gives a letter designation for the overall size of the sheet on which the drawing has been made
How can you tell when a blueprint was originally drafted?
On the approvals block, sometimes referred to as the sign off block, this area provides a space for the signatures or initials of the person(s) involved in drafting, checking, and approving the drawing
How can find the desirable tolerance of a piece on a schematic?
A special space is provided in every detail-drawing title block to key the most desirable tolerance to each specific dimension
How do you draw a centerline?
By drawing a line followed by a short dash
— - — - — -
A section drawing allows us to see how the piece would look if part of it were cut away, what do the slanted cross-hatch lines show?
The cut surfaces
What is a continuous lever with equal arms?
A pulley
When discussing a thread specification the letter A following the class specifies an external thread, the letter B specifies?
An internal thread
When discussing thread specification Class 1 fit is the loosest and Class 3 is the tightest. What does RH and LH designate?
RH is right hand and LH is left hand, RH is usually omitted since it is usually the given thread style
The joint symbol appears above or below the arrow to show which which side of the joint is to be welded. If the symbol is above the arrow what side should the weld be on?
The part should be welded on the other side
Belts used with sheaves are usually what shape?
V-shaped
The compound rest is often simply called the “compound”. This mechanism is located on the saddle of the lathe and serves as a?
Base for mounting the tool holder on the Lathe
An exploded view shows all the parts in the mechanism, but?
It shows them separated from one another
What are the two major parts in a compound rest?
The lower part is a rest swivel and the upper part is a rest top
An orthographic projection shows how many dimensions?
Two dimensions
Why would the drafter draw the gear shafts as though they were all positioned in a single plane
To avoid confusion
What does a Cross section of a supply duct look like?
If a duct dimensions are given as “12x20” how wide is the duct?
12 inches
What directs the air and spreads it evenly into the space , as well as hides and protects the open end of the duct?
A diffuser
A method of developing a cone , a pyramid or any other shape that has a constant taper is called?
Radial development
What is the symbol for a fire brick on a blueprint?
Most plat give bearings in terms of (what direction) and (what distance)?
Magnetic north, feet
Which layout gives the arrangement of pieces of machinery and equipment?
Floor plan layouts
Structural drawings give information on framework , floors and?
Foundations of the plant
Flow diagrams can be what type of drawing?
Elevation drawings
Pascals law states that any fluid, liquid or gas, the pressure at any point acts how?
Equally in all directions
If equal force is applied to both the cap end side and rod end side which side will have the total greater force acting on it?
Cap side , bc there is more surface area
What piece of equipment regulates pressure and doesn’t allow it to raise to high or drop to low?
Accumulator
What is the symbol for a reservoir
What is the symbol for lines crossing?
What way are iron pipes connected?
Screwed/threaded
Why do you use a taper connection
To make it tighter, stronger
Where are flanged connections used at?
Large diameter industrial piping that Carries fluid under pressure or at high temperatures
Describe a single line drawing?
It does not look very realistic, it uses many symbols to show fittings and the sizes of parts
When two different metals make electrical contact what can happen?
A galvanic reaction
Current is measured in?
Amperes
The metal that has wire wrapped around it is called the?
Core
What does a circuit diagram show?
The loads served be each circuit. it does not indicate the physical location of any load or circuit
What does a plot plan show?
Electrical distribution to all the plant buildings
In an A/C system if the fluid changes back and forth between gas and liquid what is it called?
Refrigerant
What does an expansion valve do?
This valve holds the refrigerant on one side at a higher pressure than on the other side. It opens automatically to allow some of the liquid to flow to the low pressure side.
What system uses water as an intermediate material in cooling the air?
An indirect system
Pneumatic controls operate on what kind of pressured air?
Low pressure
Refrigerant piping drawings are usually what kind of drawing?
Single-line drawings
A good sketch is one that?
Communicates clearly
What does a pictorial sketch show?
It shows an object in three dimensions
An isometric drawing makes objects that are further back in real life larger in the drawings?
True
Parts farther from the front appear smaller than parts near the front, this kind of view is called?
Perspective
In reality parallel lines?
Never meet
