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Q1. | Due to shrinkage stresses, a simply supported beam having reinforcement only at bottom tends to. |

A. | deflect downward [Correct Answer] |

B. | deflect upward [Wrong Answer] |

C. | deflect downward or upward [Wrong Answer] |

D. | none of the above [Wrong Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ Permissible compressive strength of M 150 concrete grade is.

100 kg/cm2

150 kg/cm2

200 kg/cm2

250 kg/cm2

⇒ For a simply supported beam of span 15m, the minimum effective depth to satisfy the vertical deflection limits should be

600 mm

750 mm

900 mm

more than 1 m

⇒ Specified compressive strengh of concrete is obtained from cube tests at the end of.

3 days

7 days

21 days

28 days.

⇒ Which of the following has high tensile strength ?

plain hot rolled wires

cold drawn wires

heat treated rolled wires

all have same tensile strength

⇒ For walls, columns and vertical faces of all structural members, the form work is generally removed after.

24 to 48 hours

3 days

7 days

14 days

⇒ The ratio of the diameter of reinforcing bars and the slab thickness is.

1/4

1/5

1/6

1/8

⇒ In reinforced concrete footing on soil, the minimum thickness at edge should not be less than.

100 mm

150 mm

200 mm

250 mm

⇒ The internal dimensions of a ware house are 15 m x 5.6 m, and the maximum height of piles is 2.70 m, the maximum number of bags to be stored in two piles, are.

1500 bags

2000 bags

2500 bags

3000 bags

⇒ Placing of concrete should preferably be done at a temperature of.

0Â°C

10Â°C

23Â°C

27 Â± 2Â°C

⇒ The surface where two successive placements of concrete meet, is known as.

Contraction joint

Expansion joint

Construction joint

both (a) and (b)

⇒ The limits of percentage p of the longitudinal reinforce-ment in a column is given by.

0.15% to 2%

0.8% to 4%

0.8% to 6%

0.8% to 8%

⇒ If the effective plan area of a warehouse is 54 sq. m, and maximum height of piles permitted is 270 cm, the number of cement bags to be stored, is.

2000 bags

2200 bags

2400 bags

2700 bags

⇒ Pick up the correct statement from the following:

High percentage of C3S and low percentage of C2S cause rapid hardening

High percentage of C3S and low percentage of C2S make the cement less resistive to chemical attack

Low percentage of C3S and high percentage of C2S provide greater resistance to chemical attack

All the above.

⇒ The grade of concrete not recommended by I.S. : 456, is.

M 100

M 200

M 400

M 500

⇒ Ratio of permissible stress in direct compression and bending compression is.

less than 1

between 1 and 1.5

between 1.5 and 2.0

greater than 2

⇒ The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than.

30 minutes

40 minutes

75 minutes

90 minutes.

⇒ The dimensions of a 35 litre forma for measuring aggregates by volume, are :

length 30 cm, breadth 25 cm, height 30 cm

length 39 cm, breadth 25 cm, height 32 cm

length 27 cm, breadth 27 cm, height 48 cm

length 220 cm, breadth 25 cm, height 40 cm

⇒ The maximum percentage of chemical ingredient of cement is that of.

magnesium oxide

iron oxide

aluminium

lime

⇒ If a beam fails in bond, then its bond strength can be increased most economi-cally by

increasing the depth of beam

using thinner bars but more in number

using thicker bars but less in number

providing vertical stirrups

⇒ Pick up the correct statement from the following:

Bulking of sand is caused due to formation of a thin film of surface moisture

Fine sand bulks more than coarse sand

The volume of fully saturated sand, is equal to the volume of dry and loose sand

All the above.

⇒ You are asked to construct a massive dam, the type of cement you will use, is.

ordinary Portland cement

rapid hardening cement

low heat cement

blast furnace slag cement

⇒ The aggregate impact value of the aggregate used in.

building concrete is less than 45

road pavement concrete is less than 30

runway concrete is less than 30

all the above.

⇒ If the permissible stress in steel in tension is 140 N/mm2, then the depth of neutral axis for a singly reinforced rectangular balanced section will be

0.35 d

0.40 d

0.45 d

dependent on grade of concrete also

⇒ Pick up the correct statement from the following:

Segregation is necessary for a workable concrete

Consistency does not affect the workability of concrete

If the slump increases, workability decreases

None of these.

⇒ Prestress loss due to friction occurs.

only in post-tensioned beams

only in pretensioned beams

in both post-tensioned and preten-sioned beams

none of the above

⇒ Pick up the incorrect statement from the following:

Admixtures accelerate hydration

Admixtures make concrete water proof

Admixtures make concrete acid proof

Admixtures give high strength

⇒ The following proportion of the ingredients of concrete mix, is not in conformation to arbitrary method of proportioning.

1 : 1 : 2

1 : 2 : 4

1 : 2 : 8

1 : 4 : 10

⇒ For a longitudinal reinforcing bar in a column, the minimum cover shall neither be less than the diameter of bar nor less than

15 mm

25 mm

30mm

40 mm

⇒ As compared to ordinary portland cement, use of pozzuolanic cement.

reduces workability

increases bleeding

increases shrinkage

increases strength

⇒ Poisson's ratio for concrete.

remains constant

increases with richer mixes

decreases with richer mixes

none of the above