Final Flashcards
On a schematic, drawing, a triangle is used to represent all of the following electrical connections, except a amplifier, diode, ground, or a motor
A triangle does not represent a motor
Unlike a DC schematic, a schematic of AC circuit has no
Positive or negative signs
In a piping system, an alternate flow pattern is indicated by a
Supplementary diagram
Arrows are used on piping diagrams to indicate the
Direction of flow
DC circuit electrons flow from
One Direction only
On a electrical diagram, a dashed line indicates a
Exposed wire
The one way flow symbol shown below is from an _______ type schematics
—-<|—— (diode)
Electrical
The symbol displayed represents a
🧭
Gauge
Vent lines and drain lines are shown on a hydraulic schematic by
Dashed lines
If a schematic caries no legend clues about it may be found in the parts list , drawing title and the _______
Engineers notes
Which displayed electrical symbol represents a single pole double throw switch
0—-
—0 /
0—-
A device that uses electricity is called a
Load
Which displayed electrical symbol represents a fuse
——▪️◻️▪️◻️◻️▪️◻️▪️———
Which displayed electrical symbol shows NC contacts
🖱️
➖
/
T
Both a fuse and a circuit breaker
Open a circuit when there is a current overload
What type of diagram emphasizes connections between the elements rather than flow?
Wiring
When several wires follow the same path, they may be represented as a ______ line on a wiring diagram
Thick
In electrical circuit in which the current path goes from one load to the next load is called a _______ circuit
Series
The schematic symbol shown below represents ______ contact
Normally open relay
In the displayed diagram the forward button is marked
FOR
The flow of material in piping systems is controlled and adjusted by
Valves
Which type of projection gives a right angle view of a piping system
Orthographic
One disadvantage of a welded joint is that it?
May form slag inside the pipe
Direction to flow in a piping system may be changed by a
Elbow
Which displayed symbol represents a screwed T fitting
+
I+
+
A cock valve is used to
Turn flow on or off quickly
A valve is used to ___________ in a piping system
Control flow
Which kind of valve can be used to regulate the flow of fluid?
Globe
A check valve
Allows flow in One Direction
Which displayed symbol represents a globe valve
> o<
Which element in a hydraulic system keeps a vacuum from forming when the liquid level drops
Reservoir
The symbol is shown below represents a
Fixed displacement compressor
When equal force must be available in both directions________ cylinder must be used
Double end
Another name for a _______ way valve is a multiple position valve
Four
Which displayed symbol represents a valve in the normally closed position
Which element of a hydraulic braking system directs the flow of the brake fluid
Valve assembly
A composite symbol is created by combining______ symbols into a single symbol
Basic
A schematic diagram may be broken into local area areas to
Make the circuits easier to understand
Which of the symbols indicates a solenoid operated valve
The rectangle with a diagonal line going from corner to corner
The symbol below represents a _______ accumulator
Gas charged
The refrigeration accessory symbol shown below represents a
Line filter
NAAC and refrigeration system txv and adr valves are used on ____ control
Direct
On a refrigeration schematic, the following symbol indicates a switch that operates on
0/0
I
n
-
Rising pressure
In a diagram for electric control circuit, which of the following shows wiring to be installed at the site
Dash lines
What solid-state device can in a AC system can amplify and switch electrical signals
Transistor
Welding is classified by the
Method of producing heat
Standard dimensions for a weld
Always appear on the legend
What is the principle part of the Kaplan control mechanism?
The principle part of this mechanism is a regulating valve with valve actuator and pilot
What is the permanent magnet generator designed to give?
A long service with a minimum amount of attention
For a Pelton governor, the normal open circuit voltage of the permanent magnet generator is
240 V at 600 RPM and 160 V at 400 RPM
At what speed does the governor allow the brakes to be applied on a generator?
From 50% speed to less than 50%
Vibrators on a Woodward governor should be replaced when
Rotation doesn’t keep up high points are worn pitting in place of the track, all of the above
What is the purpose of the speed droop mechanism on an Alice Chalmers unit
To divide the load between generators in the desired proportions
What is the purpose of the dash pot on the Alice Chalmers governor?
To prevent the flyball from over correcting
A hydraulic turbine governor must maintain a balance between the
Water input to the turbines and the power requirements on the system
Governor settings in responses must take into consideration
Allowable loading of transmission lines, maximum loading of the tie lines between systems, hydraulic characteristics of the penstock and turbine, flywheel effect of the rotating mass of the turbine and generator
Any change in position of the flyball is transmitted to the pilot valve by the
Speeder rod
The rate at which the smaller plunger of the compensating dash pot returns to normal. It’s usually determined by the setting of the.
Needle valve
Isochronous governor is one that has
0% speed droop
The adjustment provided in the speed adjusting linkage to cause the governor to add speed adjustment in the lower direction as the gates open wider is
Speed droop adjustment
The governor of units designated to regulate systems frequency will generally have speed droop settings under to
0%
Governor. Safety devices usually serve to.
All of the above
The compensating dash pot is inserted in the
Restoring mechanism linkage
The compensating dash pot serves to prevent over travel or hunting of the gates by recentering the
Pilot valve
The purpose of a right angle adapter on a drill is to enable drilling in
Close quarters
The shank of a drillbit is held in the
Chuck
If you are drilling a hole all the way through a workpiece ease up on the pressure as
You approach the other side
You should use a jig when drilling
At an angle
You can prevent electric shocks from power tools by
Grounding them
A carbide tipped core bit is used for boring holes _____ in diameter
Between one and 1/ half to 3 1/2
When drilling with a diamond aggregate Core bit , you must use a special rotary hammer and a
Stand
Which of the following is useful in maintaining the proper pressure and drilling speed
An ammeter
When using an electric hammer always wear
Safety classes
What should never be removed from a three prong plug?
The grounding prong
The size of a pneumatic drill is determined by
The largest bit the tools chuck will hold
You should use a depth gauge when drilling
Blind holes
The removal of thin layers of metal and rust from a surface is
Scaling
When you use a pneumatic hammer, a flat blade chisel is best for
General chipping
You should flush a pneumatic tool with kerosene when the tool
Operates sluggishly
Electric nut runners operate at no load speeds of
0 to 2500 RPM
The Positive drive clutch mechanism on a nut runner remains engaged as long as you press the
Bit onto the fastener
Most moisture is removed from a pneumatic tools, air supply at the
Compressor
On pneumatic tools that air hose must be at least one size larger than the
Tools, air inlet
A saber saw cuts on the
Upstroke
In regular set sawblades, the Raker’s are
The straight tooth
A circular saw is best for
Long straight cuts
The Blade motion of a reciprocating saw is
Back and forth in line with the motor
Which saw cuts on the backstroke
All reciprocating saws cut on the backstroke
The size of a circular saw equals
The diameter of the blade
Rip blades have
Teeth with a chisel shape
A rip guide limits the width of the cut to about
6 inches
A diamond grit will must never be used dry because
It must be supplied with water
A saw protractor has a movable arm that can be set in small increments up to
180°
Back advancing a router top fast causes
Splintering
A wide channel cut in a material is called a
Dado
Examples of template routing include
Hinge butt mortising
The display drawing shows a
Rabbet joint
When you are planning a large surface, you should
Work down the entire surface evenly
On the back of a sanding belt, you will see a code that indicates
The grade of grit on the sandpaper
The motion of an orbital sander is
Circular
A pad sander is used with
A sheet of abrasive paper
Do not use a pad sander to
Remove paint or varnish
“Course 16–20 4–30 discs are best for
Removing paint into smooth surface irregularities
Which symbol in the marking code on a grinding wheel indicates the bond grade
The third symbol
The max safe speed for a grinding wheel with silicate bonding as
6500 SFM
Pneumatic grinders often fail because of
Improper lubrication
How often should the grease fittings in a pneumatic grinder be greased
After 40 hours of use
Nibbler’s are rated according to
The thickest gauge of mild steel they can cut
What is a loaded wet stone?
A loaded wet stone is jammed with metal and abrasive particles
What part of a wet stone should be used for sharpening a pointed tool
The sides of the stone
A power tool with an abrasive wheel is called a
Bench grinder
When sharpening reamers taps and dies, you should avoid grinding or wetting the
Tops of the lands
To calculate allowable load, you must divide the breaking strength by the design factor for instance a sling with a breaking strength of 25,000 pounds divided by a design factor of five is
5000
The point at which a load will balance is the
Center of gravity
Which type of hitch has a clamping effect on its load?
A choker hitch
The purpose of the latch on a hoist hook is to
Retain the sling
A hook should be removed if the
Tip is bent or twisted
If the strands of a wire rope appear to spiral down to the right, and if the wires in the strands appear a wire ropes, cross section would be
Right regular lay
The following factors affect strength of wire rope and is important to
Bending over a curved surface
The minimum and maximum temperature a wire rope may be exposed to is
-60° to 400°
Corrosion usually indicates severe environmental conditions or a lack of
Rope lubrication
A basic single leg sling cannot make a
Bridal hitch
A chain marked with the letter H is also known as
Grade 43
Change slings should usually be inspected
Daily
In advantage of metal mesh slings is
It can conform to irregularly shaped loads
There is a slot in one of the standard and fittings for metal mesh slings that allows it to be used
For a choker hitch
Heavy duty metal mesh is designated as
10 gauge
The highest grade of Manila rope is
Yacht rope
Which type of fiber rope is lightest and will float
Poly propylene
To avoid sharp bending and abrasion the eye of a fiber rope swing should include a
Thimble
A splice of any type in a fiber rope reduces its strength by about
10%
Before cutting a fiber rope, the end should be _____ to prevent frame
Whipped
The process of passing a rope over the sheaves of a hoist to gain mechanical advantage is called
Reeving
With a double revved hoist
True vertical lift is possible
The number of rope length between the hoist drum and the hoisting block is
Parts
Over wrapping can throw a hoist stopping point out of adjustment if a_____ limit switch is used
Geared
Hoist load chain and sling chain
Look similar
As a general rule loads should be cut on
Wooden blocks
One edge of the load serves as a pivot during_____ turning
One hook, turning damn
If a travel path over a load where people are working
Warn them to stay away from the area
When should load blocks or other holding devices be placed at the location where a load will be set
Before the load is lifted
Guard rails, mid rails and toe boards should be installed when scaffolding
Higher than 10 foot
Guard rails, mid rails and toe boards should be installed when scaffolding
Higher than 10 foot
A small scissor lift with a foot pedal has a max working height about
4 foot
The accessory to tighten wires on scaffolding to the right tension is called a
Turnbuckle
A single 16 foot portable ladder has max working distance of
12 foot
A wooden ladder shouldn’t be coded in
Paint
What type of working drawings include a parts list
Assembly drawings
Which line is used to tie specific notes to a feature in a detailed drawing
Leaders
In orthographic projection is actually a right angle projection that
Eliminates the distortions in shape and size
The three views normally shown of an orthographic projection are
The top view, front view, or side view
Adding a auxiliary view to an orthographic projection shows an objects
True shape
A screw is a _____ wrapped around a cylinder
Inclined plane
Which of the following is a permanent fastener?
Rivets are permanent fasteners
Symbolic thread drawings include
Detailed, schematic, and simplified drawings
In the specification 10–32 Nc-1b the screw has a_____ fit and a_____ handed thread
Loose; right
Every machine tool has a complete set of drawing somewhere the set includes
Detailed drawings, assembly drawings, and exploded views
In an assembly drawing parts that are completely hidden from view are shown by
Dash lines
The drafter can draw the gear shafts as though they were all positioned in a single plane too
Avoid confusion
A small line and an a D designate
A duct access door
What kind of sheet metal development uses a stretch outline?
Cylinder
The symbol of a square with diagonal lines and short lines that are vertical at the top of the rectangle represent
A fire brick
Most industrial plant specify bearings in terms of____ and distance in_____
North; feet
This type of plan covers all the area within the plants boundary lines
The site plan
The architect makes these layouts to show the arrangement of the different pieces of machinery
A floor plan
Drawing of the framework, floors, and foundations of the plant are called
Structural drawings
In Pascal‘s law, Pascal said that in any fluid – liquid or gas – the pressure at any point X
Equally in all directions
In Pascal‘s law, Pascal said that in any fluid – liquid or gas – the pressure at any point X
Equally in all directions
Stainless steel piping is usually joined by
Welded joints
This type of piping carries fluids under pressure or at high temperature
Large diameter industrial piping
Pipes for this purpose are often made with one and enlarged so that it can fit over the other end. This is a.
Bell and spigot joint
On plastic pipe, the pipe ends are sealed to the connector by
Glue seals
Single line drawings use_____ to show the fittings and the sizes of parts
Symbols
The neutral conductor which is always grounded to earth is always
White or gray
One type of architectural diagram shows electric distribution to all the plant buildings
Plot plan
The riser diagram shows how the wiring
Goes to each floor of the building
An example of flexible conduit is called
Greenfield conduit
Usually, this is built into the air handling unit
Evaporator coil
Unitary air-conditioning equipment ____ charged, and tested before installation
Assembled
Pneumatic controls operate on
Low pressure air
Refrigerant piping drawings are usually
Single line drawings
A good sketch is one that
Communicates clearly
Rapid changes in a pressure system can be accounted for by
In accumulator
A unitary air-conditioning system is
Charged before installation
Which view of an orthographic sketch should have the most important details
The front
When pouring a concrete footing, you should hold the steel rods in position with
Tie wires
Adding reinforcing steel to concrete increase______ strength
Tensile
Readymix concrete must be used within_____ hours after mixing
One
Which of the following should not be used as a covering to keyboard concrete from freezing?
Salt
How long must new concrete sit before you can install equipment on it?
28 days
Retainers on the sides of horizontally, reciprocating equipment keep it from
Walking
To isolate anchor bolts when mounting equipment on pads, surround the bolts with
Neoprene tubing
Anchor bolts should have_______ serious threading
NC or national course
What type of wrench should you use for tightening anger bolts
A torque wrench
To drill anchor bolts larger than one and a half inch you should use a
Corvette with a diamond or carbon tip
You should not use concrete mix to grout anchor bolts because the concrete
Shrinks when it sets
Grout must be used within______ of mixing
15 minutes
To smooth and exposed area of grout, you should
Cover it with mortar
What should you do with the existing equipment, lubricant and coolant when moving the equipment?
Drain and discard it
To lift heavy tools with the least amount of effort use a ______ Jack
Hydraulic jack
Using a block and tackle what is the max load that can be lifted with a pole of 100 pounds and six parts of the fall in the movable block
600 pounds
Which of the following makes the strongest sling
A chain
What is the least number of rollers you should use under a load on a skid
Three
When moving equipment with a crowbar, what should you use between the load and the floor?
A wood block
Which of the following does not have the accuracy needed to level equipment?
A bench level
Which of the following level levels requires a movable target
An optical level
You can keep the fluid pressure in a line near a preset level with______ valve
A regulating
A copy of the manufacturers testing data is often attached to the_____ of new equipment
Manual
Which of the following would you use to detect moisture in electrical equipment?
A megohmeter
An allowable startup temperature for a piece of equipment is usually
5% above or below
