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Concrete Exam > Test B-3 > Flashcards

Test B-3 Flashcards

1
Q

An engineer fails to provide a a reference stake or bench mark. What reference point do we start at mark for cut or fill?
A) Marking from center line
B) Measuring on center plan
C) One of the top back of curb elevation
D) Cut from base line

A

C) One of the top back of curb elevation

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2
Q

Epoxy an zinc are used to what?
A) be a corrosion preventer
B) cleaning agent
C) water dissolver
D) none of these

A

A) be a corrosion preventer

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3
Q

Avoiding excessive wobble an high and low points are critical in __ however horizontal locations are not
A) concrete
B) slabs
C) tendons
D) reinforcement

A

C) tendons

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4
Q

Banded tendons should be bundled into groups and not more than 5 1/2 inch diameter tendons and not more than __ 0.6 inch diameter tendons should be bundled in a group
A) 1
B) 5
C) 4
D) 3

A

C) 4

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5
Q

Best method when a fill is being made?
A) crows feet
B) use a boot
C) setting lath
D) all of the above

A

C) setting lath

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6
Q

When excavation is getting close to finish grade, what is the best way to inform the operator on how much fill is needed?
A) set orange flags
B) set crows feet
C) paint cut or fills on ground
D) hand signals

A

A) set orange flags

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7
Q

A dirt shoulder built up higher than sub grade level is called what?
A) bank plug
B) choker
C) benchmark
D) swale

A

B) choker

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8
Q

Good combination of compacting small fills on narrow shoulders or road is?
A) dozer with vibration sheeps foot/drum roller
B) grader with 6 degree blade
C) paction vibrator
D) none of the above

A

A) dozer with vibration sheeps foot/drum roller

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9
Q

The best piece of equipment for removing unsuitable material above and around utility lines is?
A) grade all
B) backhoe
C) hoe
D) track loader

A

B) backhoe

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10
Q

Construction fabrics made of polypropylene and polyester commonly called filter fabrics are used for three purposes. Which one is incorrect?
A) to filter solids out of water passing through fabrics
B) keep out water
C) separate different material
D) stability

A

B) keep out water

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11
Q

When placing down the filter fabric, the overlap should be?
A) 24”
B) 18”
C) 6”
D) 10”

A

B) 18”

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12
Q

There are several ways to compact/soil test and the most common and much faster way is?
A) nuclear test
B) sand cone testing
C) skimp test
D) bank plugs

A

A) nuclear test

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13
Q

Where a long reach is needed and if the material being excavated is loose or soft, what is the best piece of equipment to use?
A) dragline
B) bucket line trencher
C) wheel trencher
D)backhoe

A

A) dragline

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14
Q

Excavating for commercial buildings and apartment houses, there are 3 major differences, which one is incorrect
A) landscape areas
B) excavation for parking ares
C) swales between buildings
D) pool

A

D) pool

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15
Q

When taking a control test, there are four control tests, which one does not control?
A) compressive strength
B) air content
C) yield
D) density

A

D) density

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16
Q

Without the proper air content, normal concrete that is exposed to freeze/thaw cycles, will cause
A) peeling
B) blistering
C) scale and spail
D) raveling

A

C) scale and spail

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17
Q

What accelerator effect on corrosion of steel and restricts its use in concrete?
A) super plasticizer
B) retarder
C) fly ash
D) calcium chloride

A

D) calcium chloride

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18
Q

here are three major ways to compact soil, which is incorrect
A) impact force
B) vibration
C) struction force
D) static force

A

C) struction force

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19
Q

Granular soil are best compacted by?
A) impactor/rammer
B) tampers
C) vibration
D) a heavy weight dropped

A

C) vibration

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20
Q

Cohesive soil (clay) are best compacted by?
A) a heavier object
B) impact force (a rammer)
C) vibration
D) tamper

A

B) impact force (a rammer)

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21
Q

Excessive bleeding can be corrected by?
A) add more water
B) add only fine sand
C) add coarse aggregate
D) less cement

A

B) add only fine sand

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22
Q

Segregation of the coarse aggregate separation from mix can be corrected how?
A) add water
B) more sand/cement
C) air entrainment with a reduction of water
D) add aggregate

A

C) air entrainment with a reduction of water

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23
Q

Hard to finish mixes, which is sometimes called a sticky mix, how can it be corrected?
A) add aggregate
B) removing excess water/sand
C) sprinkle cement on surface
D) sprinkle water on surface

A

B) removing excess water/sand

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24
Q

In cold weather concrete should be protected at a temperature of
A) 50 degrees f
B) 32 degrees f
C) 45 degrees f
D) 40 degrees f

A

D) 40 degrees f

25
Q

Primary causes of plastic shrinkage cracks?
A) too much air entrapment
B) low slump mix
C) too much rock/sand
D) low humidity/winds

A

D) low humidity/winds

26
Q

What is more effective way of stopping plastic cracking?
A) more wind
B) no wind break
C) adding water
D) fog spray drifting across the slab

A

D) fog spray drifting across the slab

27
Q

What causes blistering on a slab?
A) over worked concrete
B) too much water
C) closing or sealing the surface too soon
D) mix to dry

A

C) closing or sealing the surface too soon

28
Q

Type nails used for nailing kickers, blocks, braces and reinforcing for walls?
A) concrete nails
B) finish nail
C) flat head nails
D) double headed nails or duplex

A

D) double headed nails or duplex

29
Q

When applying form liners, it is important to start attaching the sheet at?
A) at its center/work towards the edges
B) start at edge/work toward center
C) start at outer edge
D) start anywhere

A

A) at its center/work towards the edges

30
Q

When form liners, particularly the plastic, expand and contract noticeably with temperature changes, how can you prevent bucking or bulges?
A) form oil
B) cold water
C) curl
D) hot water

A

B) cold water

31
Q

Hardboard liners should be attached how?
A) every 2’ sq ft surface
B) every 1’ sq ft surface
C) every 1’6 sq ft surface
D) flat head nails or staple every square foot of surface

A

D) flat head nails or staple every square foot of surface

32
Q

Form liners sometimes need a form release agent, which is (bondbreaker) to prevent uneven coloring
A) curl
B) diesel
C) form oil
D) non staining form oil

A

D) non staining form oil

33
Q

Upwards deflection of the form needed to counteract the downward deflection anticipated when the concrete fills the form and after shavers are removed is called what?
A) bond
B) camber
C) anchors
D) kickers

A

B) camber

34
Q

When filling columns, walls, beams, to avoid segregation, what should bot be allowed?
A) fall freely over ties, spacers, rebar
B) concrete drop under 2’
C) concrete drop 3’
D) all of the above

A

A) fall freely over ties, spacers, rebar

35
Q

How many cylinders do you test?
A) four
B) three
C) as many needed
D) two

A

B) three

36
Q

What is the edge height of a top rail on a supported scaffold?
A) 28”-32”
B) 32”-36”
C) 24”-28”
D) 39”-45”

A

D) 39”-45”

37
Q

What is the safety factor of metal form ties?
A) 2 to 4
B) 6 to 1
C) 3 to 1
D) 2 to 1

A

D) 2 to 1

38
Q

Maximum time to use mortar after mixing is?
A) 1 hours
B) 1 1/2 hurs
C) 2 hours
D) 2 1/2 hours

A

D) 2 1/2 hours

39
Q

Which is more true in a brick veneer wall?
A) the veneer is bonded to the building
B) supports itself
C) veneer only
D) cavity space over 2”

A

B) supports itself

40
Q

ASTM C 94 requires that concrete be delivered and discharged within __ hours or before the drum has revolved __ times after introduction of water to the cement and aggregates or the cement to the aggregates
A) 2 1/2 hours - 400
B) 3 hours - 450
C) 2 hours - 350
D) 1 1/2 hours - 300

A

D) 1 1/2 hours - 300

41
Q

__ concrete is mixed completely in a stationary mixer
A) shrink-mixed
B) stationary mixer
C) mobile batcher mixed
D) central-mixed

A

D) central-mixed

42
Q

ATO, the positioning device system shall be rigged so an employee can fall no further than__
A) 1’
B) 2’
C) 3’
D) 4’

A

B) 2’

43
Q

ATO, a workman tying reinforcing steel shall be protected from falls of the worker level is minimum of how far above the next lower level?
A) 6’
B) 12’
C) 8’
D) 16’

A

A) 6’

44
Q

How often do you check first aid kit?
A) yearly
B) monthly
C) weekly
D) daily

A

C) weekly

45
Q

ATO, a new business employing 8 employees must?
A) post the written policy
B) verbally talk with each employee
C) place written policy with first check
D) have a written safety policy

A

B) verbally talk with each employee

46
Q

To prevent large objects from falling off scaffolding
A) designate an employee to place them properly
B) have them placed away from edge
C) don’t place objects on scaffold
D) none

A

B) have them placed away from edge

47
Q

How thick is a bearing concrete wall?
A) 10”
B) 7.5”
C) 12”
D) 6”

A

B) 7.5”

48
Q

What type of guard does OSHA require on a power saw?
A) barrier guard
B) point of operation guarding
C) one finger on-off switch
D) none

A

B) point of operation guarding

49
Q

When digging a trench, how far down can you go before needing any rails or safety equipment?
A) 6’
B) 4’
C) 3’
D) 8’

A

B) 4’

50
Q

What color paint is used to mark out excavation area?
A) blue
B) white
C) red
D) orange

A

B) white

51
Q

The color yellow is used for?
A) gas, oil, steam, chemical
B) gas, oil, water
C) water
D) sewer, storm drain

A

A) gas, oil, steam, chemical

52
Q

What does reinforced concrete provide
A) strength
B) fast and proper curing
C) tension
D) water tight concrete (workability)

A

C) tension

53
Q

What is the depth of contraction?
A) 1/4 to 1/3 the slab thickness
B) 1/3 to 1/2 the slab
C) 1/2 to 3/4 the slab
D) anchor point to the bottom of slab

A

A) 1/4 to 1/3 the slab thickness

54
Q

How do you compact granular soils?
A) using proper hoeing techniques
B) hydration and brushing
C) vibrating, tamping, rolling, or temporary weights
D) add more granular soil

A

C) vibrating, tamping, rolling, or temporary weights

55
Q

Concrete plies cast-in-place against earth, MINIMUM strength?
A) 2,000 psi
B) 2,500 psi
C) 3,000 psi
D) 3,500 psi

A

B) 2,500 psi

56
Q

When total concrete is less than __ yards in strength tests are not required when approved by building official
A) 25
B) 50
C) 75
D) 100

A

B) 50

57
Q

Frequency of concrete testing must be once each day a given class is placed. Once for each __ yards of each class, nor less than and provide less than five test
A) 100
B) 125
C) 150
D) 200

A

C) 150

58
Q

According to IBC, __ mil poly vipor retarder with joints lapped not less than __ inches shall be placed between floor and slab
A) 3, 6
B) 4, 6
C) 4, 12
D) 6, 6

A

D) 6, 6

59
Q

What effect does epoxy zinc coatings have in steel?
A) increase bond
B) bond strength
C) corrosion resistance
D) none of these

A

C) corrosion resistance

Concrete Exam (7 decks)

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