RC Technology

Question 1

A mixture of water, cement, sand, gravel, or other aggregates.

Answer 1

Concrete

Question 2

The nominal maximum sizes of coarse aggregates should be greater than ____ the narrowest dimension between sides of forms, ___ the depth of slabs, or ____ the minimum clear spacing between individual reinforcing bars.

Answer 2

1/5, 1/3, 3/4

Question 3

The shortest length in meters of a commercially available rebar.

Answer 3

6

Question 4

Aggregates that passes through a No. 4 sieve (about 6mm in size).

Answer 4

Fine Aggregates

Question 5

The nominal diametre of #8 rebar.

Answer 5

25

Question 6

It is the 28th day compressive strength of concrete.

Answer 6

fc’

Question 7

The maximum number or rebar in a bundled bar.

Answer 7

12

Question 8

The load factor for a dead load as per NSCP 2001.

Answer 8

1.4DL

Question 9

The load factor for a live load as per NSCP 2001.

Answer 9

1.7LL

Question 10

The load factor for a wind load as per NSCP 2001.

Answer 10

1.7

Question 11

A composite member consisting of concrete and reinforcing bars.

Answer 11

Reinforced Concrete

Question 12

The strength reduction factor for flexure is ____.

Answer 12

0.9

Question 13

The nominal diametre of #3 rebar in mm.

Answer 13

10mm

Question 14

The yield strength of grade 40 steel rebar in MPa.

Answer 14

276MPa

Question 15

The maximum usable strain for concrete is ___.

Answer 15

0.003

Question 16

Aggregates that are retained through a No. 4 sieve. (about 6mm in size)

Answer 16

Coarse Aggregates

Question 17

It is the empirical test that measures the workability of fresh concrete.

Answer 17

Slump Test

Question 18

It is the process in which the concrete is protected from loss of moisture and kept within a reasonable temperature range.

Answer 18

Curing

Question 19

What is the standard weight in kilograms of one bag Portland Cement?

Answer 19

40 kg

Question 20

Compute for the modulus of Elasticity in MPa of concrete with fc’ = 21 MPa

Answer 20

21.538 kPa

Question 21

It is the ratio of weight of water to the weight of cement used in a concrete mix.

Answer 21

Water-Cement Ratio

Question 22

What is the minimum concrete cover in mm for concrete cast against and permanently exposed to earth.

Answer 22

75 mm

Question 23

A type of beam with fixed support and a roller support at the other end.

Answer 23

propped beam

Question 24

A type of admixture that reduces the inter-particle forces that exist between cement grains in the fresh paste; thereby increasing the paste fluidity.

Answer 24

Plasticisers

Question 25

Which of the following is NOT a property of hardened hydraulic cement concrete?

• Economy
• Durability
• Density
• Workability

Answer 25

Workability

Question 26

These are referred to as permanent loads or unmovable loads in structures.

Answer 26

Dead Load

Question 27

As per NSCP 2001, what is the uniform liveload for residential occupancy in kPa?

Answer 27

2 kPa.

Question 28

True or False: Water coming from clear canals can be mixed in concrete.

Answer 28

False

Question 29

True or False: Reinforcing Steel is strong in tension.

Answer 29

True

Question 30

True or False: The higher the water cement ratio, the lower the strength of concrete.

Answer 30

True

Question 31

True or False: Deformed rebar is better than plain rebar.

Answer 31

True

Question 32

True or False: Tables and chairs inside a classroom is considered Dead Load.

Answer 32

False

Question 33

True or False: Live loads for classrooms are larger than that of the libraries.

Answer 33

False

Question 34

True or False: Elongated gravel is better than rounded gravel.

Answer 34

False

Question 35

True or False: Under-reinforced design is more preferred by designers other than the over-reinforced design.

Answer 35

True

Question 36

True or False: A slump of zero mean high workability.

Answer 36

False

Question 37

True or False: Concrete is strong in compression.

Answer 37

True

Question 38

True or False: If the water-to-cement ratio decreases, concrete strength increases.

Answer 38

True

Question 39

True or False: If the water-to-cement ratio decreases, porosity decreases.

Answer 39

True

Question 40

True or False: If the water-to-cement ratio decreases, solid-to-space ratio increases.

Answer 40

True

Question 41

True or False: Wind pressure for structures built in Manila is lesser than those in Palawan.

Answer 41

False

Question 42

True or False: A 3000 psi concrete has a 28th compressive strength equal to 27 MPa.

Answer 42

False