Questions Bank pt 2

Question 1

What is the name of the tool used to remove pits or rough surfaces from valve of faucet seats?

Answer 1

seat dressing tool

Question 2

Which of the two pipes when used on the same line would react chemically and eventually cause corrosion?

Answer 2

copper and galvanized iron pipes

Question 3

What type of faucet is now most often used on plumbing fixtures?

Answer 3

compression type

Question 4

Which of the following supply pipe materials which could resist water hammer and is good for alkaline water?

Answer 4

galvanized pipe

Question 5

Aside from letting excess water escape below the flood level rim of the fixture, what is the other purpose of the overflow?

Answer 5

protect against self-siphonage

Question 6

Which of the following plumbing materials is most susceptible to damage from water that contains calcium carbonate?

Answer 6

copper

Question 7

Which of the water closets is the most efficient, the quietest and the most expensive

Answer 7

siphon action

Question 8

Approximately how much amount of lead will be poured on a 4” cast iron joint?

Answer 8

4 lbs

Question 9

A reinforced concrete pipe and vitrified clay pipe are example of a stone based piping. Which of the following is also referred as stone based pipe?

Answer 9

fiberglass pipe

Question 10

What must bathtubs be provided when recessed into the finished walls?

Answer 10

they must have waterproof joints

Question 11

What may happen if a cold or damp ladle is plunged into a pot of lead?

Answer 11

the lead will explode

Question 12

What happens when moist air is trapped in a horizontal vent pipe?

Answer 12

can cause corrosion on the pipe

Question 13

Which of the non-ferrous pipe material is the most popular material for use in the plumbing system?

Answer 13

copper

Question 14

Why is that annealed copper should be used for underground installation?

Answer 14

it could handle the stresses and forces an encountered in underground application

Question 15

Where must a vent pip be connected to a horizontal soil or waste pipe?

Answer 15

above the centerline of the soil or waste pipe

Question 16

Which of the following gives the correct classification of bends?

Answer 16

by the degree of turn and by diameter of the bend

Question 17

In what way is a compression joint similar to a slip joint in copper piping?

Answer 17

both use a threaded nut in compression to form a joint

Question 18

In what condition does the PVC pipe become brittle?

Answer 18

in cold weather

Question 19

What fitting is used when it is necessary to replace a section of soil pipe or install a fitting into an existing pipeline?

Answer 19

Kafer fitting

Question 20

When are 1/8 offsets generally used?

Answer 20

used to carry the soil or waste lines past obstruction

Question 21

Which of the following fitting should not be used within a sanitary installation?

Answer 21

increaser

Question 22

Combination wye and 1/8 bends are used to make changes of direction of how many degrees?

Answer 22

90 deg.

Question 23

What is the main reason why the use of brass as a piping material became less popular?

Answer 23

because it contains lead

Question 24

What is the term used for a tee that enters the straight through section of the fitting on a downward curve?

Answer 24

drainage pattern

Question 25

Straight tees are used in what section of the DWV system?

Answer 25

vent

Question 26

What is the greatest advantage of using DWV plastic pipe and fittings for residential sanitary system?

Answer 26

resistance to deposit formation

Question 27

In sprinkler system, what is the common type of joint used wherein a special coupling is used t o connect the two ends?

Answer 27

rolled joint

Question 28

This method of joining the pipe is sometimes referred to as a mechanical joint. What type of joint is this?

Answer 28

flanged joint

Question 29

What is t he minimum size of cast iron soil pipe being manufactured for use in a DWV system?

Answer 29

2"

Question 30

Both the sanitary cross and straight cross are used in the piping system, however they are not permitted to be used in?

Answer 30

horizontal line piping

Question 31

What is the system used in correlating the many metal alloys and is indicated in pipes for the identification of the users?

Answer 31

Universal Numbering System

Question 32

Aside from being used in testing a system for leaks, what is the other use of a test tee?

Answer 32

used as a permanent cleanout

Question 33

What precaution should be taken when pliers are needed to loosen a chrome swing spout lock nut?

Answer 33

wrap round nuts with adhesive tape to avoid destroying the chrome finish

Question 34

What characteristics has an oakum in the lead and oakum joint that is lacking in other Joint?

Answer 34

the wet oakum will expand thus making the joint gas and watertight

Question 35

Which of the following give the correct reason why the DFU value in vent pipe sizing is the same as that of waste pipe sizing?

Answer 35

The amount of air required by plumbing system is proportional to the amount of waste flowing in the drainage pipe

Question 36

This is often referred to as the starting point of a storm water drainage system?

Answer 36

roof drain

Question 37

If the projecting walls are opposite from each other, what will be the percentage that will be added to the roof area?

Answer 37

0%

Question 38

Why do single handle mixing faucets last longer than other types before repairs are being made?

Answer 38

because of fewer contacts between the washer and the seat

Question 39

When a globe valve does not control the water, what must be done to control it?

Answer 39

the washer might be worn out so it must be replaced

Question 40

What is the minimum gage number of galvanized sheet metal that could be used as a rainwater downspout or conductor it is to be located on the exterior side of a low height building?

Answer 40

Gage 26

Question 41

What do you call the process in which all type of iron-based metals rust?

Answer 41

tuberculation

Question 42

Which pipe support is recommended in holding a single horizontal soil or waste branch?

Answer 42

clevis

Question 43

What is the science that studies water in motion?

Answer 43

hydraulics

Question 44

MWSS stands for:

Answer 44

Metropolitan Waterworks and Seweage System

Question 45

Which of the following is among the types of material pipe support used for vertical application?

Answer 45

metal strap

Question 46

What type of trap may be used on the house drain immediately before the house

Answer 46

house trap

Question 47

Originally, solvent system uses what type of material for its drainage, aerator and de-aerator fittings?

Answer 47

copper

Question 48

What is the color for a pipeline containing gases in either gaseous or liquified form, vapors, and pneumatically conveyed fumes and materials?

Answer 48

safety yellow (ANSI)

Question 49

It is a copper pipe that can be used in water distribution system above and underground pipe installation

Answer 49

type M

Question 50

A type of copper tube used for how water heating and low pressure steam sizes up to 32 mm

Answer 50

type M

Question 51

A type of copper tube used for how water heating and low pressure steam sizes 32 mm and larger

Answer 51

type DWV

Question 52

A type of copper tube used for hot water heating condensate return lines

Answer 52

type L

Question 53

A type of copper tube used for chilled water mains sized 32 mm and larger

Answer 53

type DWV

Question 54

A process of first raising the temperature in separate the more volatile from the volatile part and then cooling and condensing the resulting vapor so as to produce a nearly purified susbstance

Answer 54

distillation

Question 55

The minimum temperature at which any material gives off in sufficient concentration to form an ignitable mixture

Answer 55

flash point

Question 56

A kind of stable explosive compound

Answer 56

fulminate

Question 56

A process where a piece of metal is heated prior to change its share or dimensions

Answer 56

forcing

Question 57

A cabinet where fire hoses, valves, and other equipment are stored and arranged for firefighting

Answer 57

hose box

Question 58

Descriptive of any substance that ignites spontaneously when exposed to air

Answer 58

pyrophoric

Question 59

A passage hack or antechamber between the outer doors and interior parts of a house or building

Answer 59

vestibules

Question 60

Areas within which only certain types of buildings are permitted to be constructed based on their use or occupancy, type of construction, and resistance to fire

Answer 60

fire zone

Question 61

It shall not be used for toxic fluids or oxygen, flammable liquids or gases above ground

Answer 61

thermoplastics

Question 62

Pneumatic test pressure shall not be exceed times design pressure

Answer 62

1.25

Question 63

It shall not be used above ground in oil or other flammable liquid service nor compressed gas service

Answer 63

cast iron pipe

Question 64

A highest point in the internal cross-section of the trap at the lowest part of the bend

Answer 64

top dip

Question 65

Which of the following uses the operating principles of a ball valve?

Answer 65

quick opening valve

Question 66

What is the SI unit of relative intensity

Answer 66

unitless

Question 67

The pressure of 1 bar is equivalent to how many Pascals?

Answer 67

100,000

Question 68

Which of the following is equivalent to a volt?

Answer 68

joule/coulomb

Question 69

One election volt is equivalent to

Answer 69

1.6 x 10^19 joules

Question 70

Which of the following is the equivalent to the unit "farad"?

Answer 70

coulomb/ volt

Question 71

Which of the following is equivalent to the unit "ampere"?

Answer 71

coulomb/ second

Question 72

Ohm is equivalent to which of the following?

Answer 72

volt/ ampere

Question 73

What is the unit of luminous flux

Answer 73

lumens

Question 74

Which of the following is equivalent to the unit "candela"?

Answer 74

lumens/steradian

Question 75

What is the unit of luminous efficiency?

Answer 75

lumen/watt

Question 76

What is the unit of illumination?

Answer 76

lux

Question 77

Lux is equivalent to which combination of units?

Answer 77

lumen/m2

Question 78

Footcandle is equivalent to which combination of units?

Answer 78

lumen/ft2

Question 79

How many dynes are there in one Newton?

Answer 79

100,000

Question 80

What is an elemental unit of energy?

Answer 80

quantum

Question 81

What refers to the mass which is accelerated at the rate of one foot per second when acted on by a force of one pound?

Answer 81

slug

Question 82

The size of some bacteria and living cells is in the order of

Answer 82

micrometer

Question 83

The size of the largest atom is in the order of

Answer 83

nanometer

Question 84

The mass of grain of salt is in the order of

Answer 84

milligram

Question 85

Which one is equivalent to the unit "joule"?

Answer 85

Newton-meter

Question 86

Which one is equivalent to the unit of "watt"?

Answer 86

Newton-meter per second

Question 87

The "kilowatt-hour" is a unit of

Answer 87

work or energy

Question 88

The English unit "slug" is a unit of

Answer 88

mass

Question 89

An electron volt is the energy required by an electron that has been accelerated by a potential difference of how many volts?

Answer 89

1 volt

Question 90

What is a vector with a magnitude of one and with no unit?

Answer 90

unit vector

Question 91

What is the purpose of unit vector?

Answer 91

to describe the direction in space

Question 92

What is another term for a scalar product of two vectors?

Answer 92

dot product

Question 93

What is another term for vector product of two vectors?

Answer 93

cross product

Question 94

The scalar product of two perpendicular vector is always

Answer 94

equal to 0

Question 95

The vector product of two parallel or anti parallel vectors is always

Answer 95

equal to 0

Question 96

The vector product of any vector with itself is

Answer 96

equal to 0

Question 97

What refers to physical quantities that are completely specified by just a number and a unit of physical quantities that have magnitudes only?

Answer 97

scalar quantities

Question 98

What is an arrowed line whose length is proportional to the magnitude of some vector quantity and whose direction is that of the quantity?

Answer 98

vector

Question 99

The of a moving object is the distance it covers in a time interval divided by the time interval

Answer 99

average speed

Question 100

The rate at which velocity changes with time is know as

Answer 100

acceleration

Question 101

"The work done by the net force on a particle equals the change in the particle's kinetic energy". This statement is known as

Answer 101

work-energy theorem

Question 102

The of a particle is equal to the total work that particle can do in the process of being brought to rest

Answer 102

Kinetic Energy

Question 103

Work is defined as the product of

Answer 103

force & displacement

Question 104

What is defined as any influence that can change the velocity of an object?

Answer 104

force