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Trade Study Guide > Study Guide 1 > Flashcards

Study Guide 1 Flashcards

1
Q

1) Concrete is stronger in compression and sheer, but weak in tension

True or False 

A

True 

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2
Q

2) Whenever tension is present, the concrete is reinforced with steel

True or false

A

True

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3
Q

3) Standard steel moles 6“ x 12“ high are used to test concrete after _____ days or _____ days of curing. The cylinders are placed in a laboratory testing machine.

A, 8, 30
B, 7, 28
C, 2, 8
D, 28, 7

A

Answer is B

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4
Q

4) When a 3000 PSI concrete is specified, the cylinders after 28 days break about:

A, 90,000 -100,000 LB. Load
B, 80,000 - 90,000 LB. Load
C, 70,000 - 80,000 LB. Load
D, 60,000 - 70,000 LB. Load

A

A, 90,000 to 100,000 LB. Load 

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5
Q

5) In loaded beam or slab both vertical and horizontal shear are present and the net result of the two forces is called:

A, Stress
B, Fatigue
C, Diagonal tension
D, Tension

A

C, Diagonal Tension

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6
Q

6) Cracks resulting from the force referred to in the above question always occur near a support and:

5] Question above; in a loaded beam or slab both vertical and horizontal sheer are present in the net result of the two forces is called.

A, Extended downward
B, Extended laterally away from the support
C, Extended upward and outward on an angle of 45° to the top.
D, Parallel the lower level of the perpendicular being or slab.

A

C, Extend upward and outward on angle of 45° to the top

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7
Q

7) In slab floors the supporting columns subject to forces can crack and this is known as:

A, Punching Shear
B, Tension
C, Compression
D, Torque

A

A, Punching Shear

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8
Q

8) A beam with a load on top tends to slip down, due to what is called:

A, Compression
B, Shear
C, Vertical shear
D, Torsion

A

C, Vertical shear

(Think of corbels on this one)

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9
Q

9) Tension in concrete can be caused by bending or sheer as in beam shrinking.

True or false. 

A

True

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10
Q

10) In a simple beam (also simple slab, joist, girders) carrying loads, the top of the beam is _____ and the bottom of the beam is in _____ .

A, Shear, Compression.
B, Tension, Shear
C, Shear, Tension
D, Compression, Tension

A

D, Compression, Tension

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11
Q

11) Longitudinal steel (in the case above) is located _____ to prevent the failure of the concrete and tension.

Question 11 from above:
In a simple being (also simple slab, joist, girders) carrying loads, the top of the beam is _____ and the bottom of the beam is in _____ .

A, At the bottom
B,  At the top
C, Mid-Span
D, At the ends

A

A , At the bottom

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12
Q

12) When a beam deflects under a load, shear stresses are also present. To resist diagonal tension (refer to question in 5 and 6) small U or W shaped bars are used they are known as:

A, Hooks
B, Ties
C, Stirrups
D, Chairs

A

C, Stirrups

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13
Q

13) The bars in question 12 are more closely space near the supports and space and increasingly _____ towards mid span.

Question 12:  When a beam deflects under a load, shear stresses are also present. To resist diagonal tension (refer to question in 5 and 6) small U or W shape bars are used they are known as.

A, Closer
B, Farther Apart
C, Tighter
D, Diagonal

A

B, Further Apart.

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14
Q

14) Continuous beams (or slab) which extend over more than one span deflect downward between supports and have an upward thrust over supports. This requires tension steel In the _____ between supports and in the _____ over the supports.

A, Bottom, Top
B, Top, Bottom
C, Center, Bottom
D, Center, Top

A

A, Bottom, Top

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15
Q

15) Cantilever beams deflect at the top when loaded, so tension bars must be placed in:

A, The Bottom
B, The Bottom and Top
C, The Top only
D, Mid - Span

A

C, The Top only

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16
Q

16) Walls braced at the top and bottom by floor slabs and loaded with horizontal pressure on the outside face:

A, Deflect Outward
B, Do not Deflect
C, Deflect Inward
D, A & B

A

C, Deflect Inward

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17
Q

17) With a wall situation as described above, bars are required on the _____ when there is tension.

Question above:  Walls braced at the top and bottom by floor slabs and loaded with horizontal pressure on the outside face.

A, Inside Face.
B, Outside Face
C, Mid Center
D, All of the above

A

A, Inside Face.

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18
Q

18) Cantilever retaining walls deflect and usually require main bars ________.

A, On the side away from the earth
B, On the side towards the earth
C, Always on both sides
D, None of the above

A

B, On the side towards the earth.

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19
Q

19) Combine footing supporting loads at two or more points, supported by a uniform soil pressure upward over the entire area of the footing, tends to:

A, Curl up the projecting ends
B, Bow up between columns
C, Curl up the outer corners
D, All of the above

A

D, All of the above.

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20
Q

20) At inside (wall) corners rebars are in tension and should never be bent around the corner, as they would tend to pull straight and could break out the concrete.

True or false

A

True

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21
Q

21) Rebar for inside corners: 

A, Should butt ends and be welded.
B, Should extend past the corner from each direction four diameters.
C, Should extend past the corner from each direction to the far face and be hooked, if necessary.
D, Rebar is never set to the inside corner, but always to the outside edge and placed as indicated by the engineer.

A

C, Should extend past the corner from each direction to the far face and be hooked, if necessary.

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22
Q

22) While the main purpose for steel in concrete is to resist tension force, it is also used to advantage:

A, To resist shear.
B, To resist erosion.
C, To resist temperature changes.
D, To resist compression forces.

A

D, To resist compression forces.

For example, keeps columns from buckling outward.

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23
Q

23) Column ties (spirals) are used and space to:

A, Prevent the vertical bars from bending inward.
B, Prevent the vertical bars (in compression) from buckling and breaking out of the concrete.
C, Prevent the concrete around the vertical steel from cracking.
D, All of the above. 

A

B, Prevent the vertical bars (in compression) from buckling and breaking out of the concrete.

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24
Q

24) Bars are furnished in several grades. Each grade has what is known as:

A, Elastic Strength
B, Ultimate Strength
C, Yield Strength
D, Both B & C

A

D, Both B and C

B, Ultimate strength
C, Yield strength

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25
Q

25) The load limit to which the steel will stretch and return to its original length is:

A, Elastic Strength
B, Tension Strength
C, Yield Strength
B, Both A & B

A

C, Yield strength

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26
Q

26) The load limit at which steel will break is:

A, Yield Strength
B, Breaking Point
C, Ultimate Strength.
D, Fracture Limit

A

C, Ultimate Strength.

Note: Can also be referred to as ultimate “tensile” strength.

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27
Q

27) In order to protect bars against fire, corrosion or exposure to whether, they must have:

A, Protective coating over them.
B, A Minimum coverage of concrete.
C, A Bituminous wrapping.
D, All the above.

A

B, A minimum coverage of concrete.

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28
Q

28*) To obtain uniformity throughout the United States, the ______ has prepared standard specifications for these steels:

A, ASTM
B, UBC
C, ACI
D, AISC

A

*A,  “ASTM” American Society for Testing & Material.

29
Q

29) The (rebar) grade markings will appear on:

A. Bar bundle tags
B. The rolled bars
C. The bills of material
D, All of the above

A

D, All of the above

30
Q

30*) The billet steel bar is: 

A, 615 Grade 40, 60, 75
B, 615 Grade 50, 60
C, 617 Grade 40, 60
D, 700 Grade 40, 50, 60

A

*A, 615 Grade 40, 60, 75

Note: The numbers 40, 60, 75 are rated at thousands of PSI minimum yield strength.

31
Q

31) Rail steel bars are:

A, 615 40, 60, 75
B, 616 Grade 50, 60
C, 617 Grade 40, 60
D, 700 Grade 50, 60

A

B, 616 Grade 50, 60

32
Q

35*) Deform bars are always designated by numbers.There are _____ size (standard)

A, 5
B, 10
C, 11
D, 13

A

*C, 11 total sizes

Note: #3 to #11, #14 & #18.
Some larger numbers can be manufactured but are not common.

33
Q

36) The number denotes approximately the size of the bar:

A, In Circumference.
B, In diameter of inches.
C, in diameter of the bar in eights.
D, In weight per lineal foot.

A

C, in diameter of the bar in eights (1/8).

34
Q

37) Specifications require that each bar producer shell roll on to the bar:

A, A litter or symbol of the producers mill.
B, A number size.
C, The type and grade.
D, All of the above.

A

D, All of the above.

35
Q

38*) There are many types of bends, but the most common type have been left up to the field bending techniques of each firm.

True or false

A

False

Note: Standardize by the American Concrete Institute.

36
Q

39) All of the bend types have a letter assigned to each dimension of the bar. When all the dimensions are used on a list. The exact shape of the bar shown will be produced. By omitting certain letters, a shape may be modified.

(Please refer to placing reinforcing bar, chapter 6 page 6-5 through 6-7)

A

Question 39 gives no answer.

By omitting certain letters, a shape may be modified.

Use double 180° been bars, as best example. 

37
Q

40) Spirals are used in spirally reinforced columns, piers and piles and are made of ______ or wire:

A, Deform Bars.
B, Smooth Rod.
C, Pencil Rod.
D, #5 Bar Only.

A

B, Smooth rod.

Note: I have seen the deformed bar turned into spiral to.

38
Q

41) The spirals are bent to a specified diameter into a form “similar” to that of:

A, A coiled spring.
B, A Stack
C, A Bend
D, All of the above

A

A, A coiled spring.

39
Q

42) The spacing of the rod is important and spacers are provided to hold this spacing, known as:

A, Lock
B, Tieing
C, Pitch
D, Lips

A

C, Pitch

40
Q

43) Hooks are used at the end of bars: 

A, When the bar is too long and cannot be cut.
B, At corners and radius bands
C, When the straight length of the bar cannot provide enough embedment in the concrete to properly anchor the bar.
D, Usually when there is a tendency for the beam or column to be in tension.

A

C, When the straight length of the bar cannot provide enough embedment in the concrete to properly anchor the bar.

41
Q

 44) They are three (3) types of hooks generally used; they are:

A, 30, 60, 90
B, 60, 90, 120
C, 120, 160, 180
D, 180° 135° 90°

A

D, 180° 135° 90°

42
Q

45) The standard for all bars except stirrups and columns are:

A, 120° 30°
B, 60° 90°
C, 135° 90°
D, 180° 135°

A

C, 135° 90°

43
Q

46) The ______ hook is preferred by most fabricators because of its ease of bending, stacking and placing.

A, 30°
B, 60°
C, 90°
D. 120°

A

C, 90°

44
Q

47*) The term “hook” refers to all cases where the dimensions of a bar bent at the ends are designated:

A, A or B
B, A or C
C, A or G
D, A or A

A

*C, A or G

Note:  otherwise the term is “bent” (keyword-hook & bent)

45
Q

48*) Bundles of bars are limited to weight that can be conveniently handled:

A, By one man
B, By two men
C, With equipment
D, Any of the above

A

C, With equipment.

Note: approximately 3,000 lbs. 

46
Q

49*) Bundles and lifts are securely tied by wire for bands. In general, no. _____ gauge wire is used for larger bundles.

A, 8
B, 9
C, 10
D, 12

A

*B, 9 Gauge Wire.

Note: #12 Gauge for smaller, and requires two (2) ties per bundle.

47
Q

50) The main factor affecting bond are the presence of:

A, Scale
B, Rust
C, Oil and Mud
D, All of the above

A

D, All of the above (I DO NOT AGREE, BUT GO WITH THIS FOR TEST ONLY)

48
Q

51) Tight scale remaining on the bar is normal and does not have any harmful effect.

True or false

A

True

49
Q

52) Rust improves bond because it increases the normal roughness of the surface.

True or false

A

True

50
Q

53) Only when the height of the deformations or the weight of the bar is reduced would rust be considered harmful.

True or false

A

True

51
Q

54) Reinforcing bars with rust or mill scale or combination of both are considered to be acceptable without cleaning or brushing if the deformations and weight of the bar is not less than ASTM specifications.

True or false. 

A

True

52
Q

55) To remove machine oil or grease on rebar it must be done with:

A, A torch
B, Wiping by solvent
C, Sandblasting
D, A & B

A

D, A & B (I DO NOT AGREE, BUT GO WITH THIS FOR TEST ONLY. SHOULD NEVER APPLY HEAT TO REBER)

53
Q

56) When power hoisting equipment is not available, the bundles of bars may be skidded from the truck over timbers or rails extending from the truck bed to the ground.

True or false

A

True

54
Q

57) The types of hosting equipment depend upon:

A, The size of the job.
B, Wether the equipment is being used in a congested area.
C, The hight of the structure.
D, All of the above

A

D, All of the above.

55
Q

58) The most common used hoists are: (One is wrong, which is it)

A, Derrick Crane
B, Truck Crane
C, Hydraulic Crane
D, Tower Crane and Chicago Boom

A

A, Derrick Crane

56
Q

59) A stiff-legged hoist usually mounted directly on the structure under construction is:

A, Chicago Boom.
B, Derrick 
C, Tower Crane
D, Truck Crane

A

A, Derrick Crane

(Mainly on structural steel)

I have never seen or heard of one being used on a concrete structure.

57
Q

60) When hoisting bundles of bars 30 feet or longer it may be necessary to use a/an.

A, Additional Crane
B, Additional Hook
C, Spread Bar.
D, Any of the above

A

C, Spread Bar.

58
Q

61) When tag lines are used, ______ is the most commonly used for this purpose.

A, Wire
B, Cable
C, Chain
D, Fiber Rope.

A

D, Fiber Rope.

59
Q

62) Crane signals on study guide 8

A

Crane signals on study guide 8

60
Q

63) For bundles of bars under 30 feet in length, a _____ of two slings is most commonly used.

A, Sling
B, Bridal Hook-Up
C, Choker
D, Shackle

A

A, Sling

61
Q

64) When two slings or chokers are used in lifting bundles of bars the loop should be treaded.

A, In the opposite direction
B, In the same direction
C, In opposing position
D, And twisted

A

B, In the same direction.

62
Q

65) The bar fabricator uses the structural and architectural plans to prepare bar placing drawings.

True or false

A

True.

It’ll more than likely be the detailer putting these together

63
Q

66) Placing drawings do not as a rule show dimensions.

True or false

A

True

Do not show construction dimensions but show rebar dimensions on the cut sheets

64
Q

67) You are placing reinforcement in a basement wall of a commercial building. After the wall footing is placed with vertical dowels projecting from it, you wire vertical bars to the dowels which are the same size as the vertical bars. You then place the horizontal bar, 3 ties to a bar, with ties spaced at 6’ intervals. You have proceeded: 

A, Correctly
B, Incorrectly — The dowels should be of a lesser diameter then the vertical bars.
C, Incorrectly — There are not enough ties to a bar.
D, incorrectly — The bars are not spaced far enough apart.

A

A, Correctly

65
Q

68) Spiral that are furnished without spacers are called ______ .

A, Coiled
B, Unassembled
C, Unmounted
D, Loose

A

B, Unassembled

66
Q

69) Which of the following statements about hoisting bar bundles is not true:

A, When the hoisting line and the choker are the same size and material, the tension on each choker must be greater than the tension on the hoisting line.

B, If two slings are used, loops should be threaded in the tension on the same direction.

C, The greater the angle of the choker from a vertical, the greater the tension in the choker.

D, The total weight lifted acts straight downward.

A

A, When the hoisting line and the choker are the same size and material the tension on each choker must be greater than the tension on the hoisting line.

A Is the wrong option.

67
Q

32) The axle steel bars are:

A, 615 40, 60, 75
B, 616 Grade 50, 60
C, 617 Grade 40, 60
D, 700 Grade 50, 60

A

C, 617 Grade 40, 60

68
Q

*33) Each mill which rolls deformed bars may have a different pattern of deformation‘s on the bar.

True or false

A
  • True

Note: But they are all rolled to ASTM specifications.m

69
Q

34) Plain bars are smooth, round bars without deformation‘s on them:

A, They are not reinforcing bars
B, They are reinforcing bars.
C, They are used as reinforcing bars for a special concrete mixers.
D, They are known as pencil rod.

A

B, They are reinforcing bars.

Trade Study Guide (8 decks)

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