Chapter 23

Question 1

A reinforced concrete, four-side-supported slab panel is:

a. a one-way slab
b. a two-way slab
c. a four-way slab
d. a or b

Answer 1

d. a or b

Question 2

A reinforced concrete, four side supported slab panel measuring 15 X 22ft is what kind of slab?

Answer 2

a two- way slab

Question 3

A reinforced concrete, four side supported slab panel measuring 15 X 32ft is what kind of slab?

Answer 3

a one way slab

Question 4

In a band beam reinforced concrete floor, the beams are ?

Answer 4

Wide and shallow

Question 5

A band beam floor is generally more economical than a beam and girder floor because>

Answer 5

its formwork is more economical

Question 6

A standard module one way joist floor is constructed using pans that are:

a. 20in wide
b. 30in wide
c. 40in wide
d. a or b

Answer 6

d. a or b

Question 7

Based on structural considerations only, the thickness of the slab in a standard-module one-way joist floor needs to exceed

Answer 7

2in to 2 1/2in.

Question 8

Pans used as formwork for one way joist floors have what type of shape?

Answer 8

U-shaped profile

Question 9

A wide module one way joist floor is constructed using pans that are:

a. 66 in. wide
b. 60 in. wide
c. 53 in. wide
d. a or b
e. a or c

Answer 9

e. a or c

Question 10

In a one way joist floor, the supporting beams run in one direction and the joists run in the other direction. If the spans in two directions are unequal, the beams should preferably span along the:

a. shorter direction
b. longer direction

Answer 10

a. shorter direction

Question 11

The formwork used for a waffle slab has what shaped?

Answer 11

dome profile

Question 12

Using standard formwork components for a waffle slab. the center to center distance between waffles (voids) is?

Answer 12

3ft, 4ft, or 5ft

Question 13

A flat slab floor consists of?

Answer 13

a slab with drop panels at each column

Question 14

A flat plate floor consists of :

a. slab of constant thickness
b. a slab with beams on all four sides of the slab panel
c. a slab with drop panels at each column

Answer 14

a. slab of constant thickness

Question 15

Commonly used beamless concrete floors are?

Answer 15

flat plate and flat slab

Question 16

in a posttensioned elevated concrete floor, prestressing tendons are combined with conventional steel reinforcement. True or false?

Answer 16

True

Question 17

The primary reason for using posttensioned concrete floors is to?

Answer 17

reduce floor depth

Question 18

The strength of concrete used in precast concrete members is generally how much ksi?

Answer 18

5ksi to 6ksi

Question 19

Portland cement used in precast concrete members is generally what type?

Answer 19

Type III

Question 20

Architectural precast refers to concrete members used building interiors. True or false?

Answer 20

False

Question 21

In mixed precast construction, precast concrete members are generally used for?

Answer 21

floors

Question 22

In total precast construction, precast concrete members are generally used for:

a. shear walls
b. load bearing walls
c. columns
d. floors
e. all of the above

Answer 22

e. all of the above

Question 23

A 12in thick hollow core floor slab will generally span up to approximately how many feet?

Answer 23

40ft

Question 24

When a concrete topping is used over hollow core slabs, its thickness is approximately how many inches?

Answer 24

2 inches

Question 25

The purpose of concrete topping on hollow core slabs is to;

a. structurally integrate the slabs
b. level the top of slabs
c. increase sound insulation of the floor
d. increase the fire rating of the floor.
e. all of the above

Answer 25

e. all of the above

Question 26

The most commonly used width of a double tee floor unit is?

Answer 26

8ft.

Question 27

Double tee floors are commonly used where?

Answer 27

where spans are in excess of 50ft

Question 28

The fire resistance rating of concrete members is a function of:

a. member thickness
b. type of coarse aggregate in concrete
c. concrete cover for corrosion protection
d. all of the above

Answer 28

d. All of the above