General Maintenance/ boma
Curb cock
A Valve insert it in a water line between the corporation stop and the water meter is generally called
A hole is to be drilled in a part. How can the dimensions of the hole be indicated most conveniently on a drawing of the part?
A brief note connected by a leader to the hole
The volume of waste entering a grease trap is limited to
A flow control fitting
When severing a length of 2 inch pipe it is preferable to use
A pipe cutter
One of the most positive means of preventing back siphonage is the proper use of an
Air gap
Needle valves
Are similar in design to globe valves
Before a second bead is laid over or next to a just completed bead in arch welding, the weld area must be:
Cleaned to remove all slag
The correct sequence of soldiering procedure is
Cleaning, rimming, fluxing, Assembly, and soldering
A standard grade, pitch, fall, or slope of a horizontal drainage system should not exceed
1/4" per foot
If an object is drawn 1/4 scale, the scale of the drawing is:
1/4"=1'0
For electrodes up to 3/16 inch in diameter, the length of the arc should be kept to approximately:
1/4inch
On a plan scale 1/8 of an inch equals 1 foot, 2 1/2 inches on a ruler scale
20 feet
Threaded pipe standard length is:
21 feet
Pipe L cooper is
Blue
A horse power is equal to_______ foot lbs. per minute
33,000
On a site development plan drawn to a scale of 1"=10'0 a 40'x80' building would be drawn:
4"x8"
We can change the performance of a given pump by changing the speed at the impeller edge. This can be done by:
By changing the rpm, by changing the impeller diameter (A&B)
When installing a P-trap, the vertical distance from the fixture to the__________ may not exceed 24"
Trap outlet
A gate valve would be Used in a application where you need to control the flow of a fluid
True
Class A fires are those of ordinary combustible materials such as wood, paper and cloth where cooling, soaking or coating of the burning materials is essential
True
Smoke detection is usually accomplish by using either photo electric scanning, ionization chambers or smoke deflection devices?
True
The basin wrench is used primary for the removal of nuts and small piping pieces from the underside of sinks and lavatories
True
The primary disadvantage of a single stage centrifugal pump is that the head at shich it will effectively pump against is limited
True
When welding galvanized metals in a confined space it is vital to make sure the area is well ventilated:
True
Baffles in a greased interceptor reduce____________ within interceptor
Turbulence
The filter lenses required for eye protection for welding is designed to safeguard the eyes from
Ultraviolet rays
When Starting a centrifugal pump That is part of a manifold with no check valves
You should open the suction valve, start the pump and open the discharge valve slowly
which of the following methods of measuring is best used for a piece of pipe which will have fitting screwed on only one end?
end to center
A device such as a sink, lavatory, toilet or shower stall is called a
fixture
Branch fittings are identified by right and left by
holding the inlet towards the observer with outlet down
If a fixture trap has excessive outlet distance or the pitch is excessive__________could occur:
self-syphon
A _________ is a direct or in direct connection Which may permit waste sewage or other non-potable water to flow into a potable water source or supply
Cross connection
When installing a P trap the vertical distance from the fixture to the _________ may not exceed 24"
Crown wear
The sprinkler system with sprinklers which they open all the time is the_______ system
Deluge
Pipes and tubing are measured in________methods
Different
Of the following, which is the most critical factor regarding the suction lift of a pump handling water
Distance
The scale of a drawing is the ratio of:
Drawing dimensions to object dimensions
A well used to fill a corner, as in a lap joint or a T joint, is called
Fillet weld
To protect a pump and motor against slight misalignment, they are often connected by a
Flexible coupling
Power equals
Force times distance divided by time
Plug valves:
Go from full open to completely closed with a quarter turn of the handle
Type K copper is color coded
Green
When you find a chisel that has a mushroomed head, you should,
Grind the head down to its proper shape
Gate valves
Have less pressure dropped than most other kinds of valves, Are available to quick opening models A&B
Consumable metallic electrodes used ac arc welding are usually of what type
Heavily coated
____________is not a normal additive in lubrication
Hexihydrene
The device used to measure battery acid strength is
Hydrometer
Continual problems with Belt turnover are likely to be caused by
Improper installation technique
Usually if the motor in the system feels hot and you think this is overloading, you should not open the flow valve further because
Increase flow will usually increase horse power requirements
Critical points of a grease interceptor or elevations of the__________ and _________ in to the water
Inlet: outlet
The long run pin on a 115 V electrical plug
Is a safety ground and should never been removed
If a coupling is not properly aligned
It will almost certainly fail more quickly than his should & it could wear out equipment bearings A&C
The simplest pump and the least expensive is the:
Jet
Which of the following is of little consequence when selecting the correct packing for a particular service
Location of equipment upon which it will be installed
Gloves for use in Welding should have
Long cuffs
To check sheave wear
Measure each groove angle
Which of the following liquids is the most viscose
Molasses
Screens or shields should be used in welding operations to protect:
Nearby workers
The recommended flame for brazing is:
Neutral
Tubing is sized by measuring the :
O.d
A sprinkler head that is mounted in an inverted position is called
Pendent, Conventional, Flush Pendant( all of the above)
The number of sprinklers that can be placed on a given pipe is governed by:
Pipe size
________are used for multigrade oils
Polymers
What term best describes water use for both drinking and cooking
Potable
What can over tightening the belt cause
Premature bearing failure, premature belt failure A&B
Absolute pressure is Gauge
Pressure plus 14.7 psi
Water fire suppression system require:
Pumps, Storage tanks, (both A &B)
Priming means
Putting fluid into the suction side of a pump
Which of the following would not be a cause of a centrifugal pump failing to deliver water?
Slight leakage of the packing
Brazed cast fittings should be cooled
Slowly
Variable pitch sheaves may be used in some cases to provide which of the following types of speech changes
Small
The coding on a metallic electrode
Stabilizes the arc and controls oxidation
Which of the following best describes the basic types of sprinkler systems in a building
Standard wet type system, Standard dry type system, deluge system ( all of the above)
Black iron pipe is often used for:
Steam heating, Gas and air pressure piping, hot water heating (all of the above)
When attempting to locate a gas leak the sense of______ is generally not used
Taste
Which is not a trap?
Tee-trap
Viscosity is
The ability of a lubricant to flow
If the packing has just been replaced on a pump and it leaks slightly at start up, first
The slight leakage is normal, monitor for excessive licking and adjust appropriately
The scale of a working drawing can be determined by
This scale will be indicated on the drawings
Torches should be inspected for leakage at the
Tip, valves, hose connections all of the above
The basic purpose of a plumbing trap is
To act as a water seal and prevent odors and gases from escaping into the living space
A foot valve may sometimes be used on the submerged end of the suction pipe of a centrifugal pump:
To keep the pump primed
A foot valve may sometimes be used on the submerged end of the suction pipe of a centrifugal pump;
To keep the pump primed
A branch steam line take off the main, should come of the:
Top of the main
the seal in a centrifugal pump may be necessary;
to prevent fluid form leaking out around the shaft , To prevent air from leaking into the pump. A&C
Grease are classified as their mobility and oil content by the
S.A.E
Removal of solids such as rock, meatal, and sand is accomplished with a __________interceptor
Sediment
Traps are installed to prevent_________ from entering the structure
Sewer gas, offensive odors, vermin (all of the above)
In most cases, belt life is most affected by
Sheave alignment
And oxygen/acetylene system is used for the following purposes
Silver soldering copper and brass joints, cutting metal, brazing (all of the above)
Which of the following alarms will start a diesel fire pump
Waterflow alarm
Purging of the hose lines of oxygen/acetylene torch should occur:
When securing the rig for the day
Parallel alignment is
Where the centerline of the two shafts are parallel
A plane journal bearing operating at a slow speed should be lubricated
With oil having a high viscosity
Its a good idea to have as little suction lift as possible. Normally you shouldn't have more than_____ feet of lift on the suction side of a pump.
15
One cubic foot of water is how many gallons?
7.48
A drainage fixture unit (dfu) is equivalent to how many gallons of water flow?
71/2 gallons per minute
A 1/4 bend changes the direction of the pipe
90 degrees
The most common type of pump in use for circulation of water today is the
Centrifugal
When assembling a large diameter screw pipe a _________Wrench is generally use
Chain
Which of the following metals is not generally considered as suitable packing material?
Chrome- steel
What methods of measuring is used to measure the full length of pipe?
End to end
The strength of a trap seal can be increased by installing___________Without violating the plumbing code
Extra deep trap
Type M cooper is
Red or pink
The main purpose of lubrication usually is to
Reduce friction and wear
To reduce slippage________ is applied to a strap wrench
Resin
What is the main purpose of the emergency electrical power system
Run equipment essential to human life for safety
