Construction Material and Management: Nuclear Quiz 1
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Assertion – The rate of hydration is slow is finer cements
Reason – The surface area is more in case of finer cement.
Which of the following statements are correct?
a) Sulphur type chemical resistant mortar has poor resistance to alkalis.
b) The interior surface of a building may be plastered with cement mortar containing cement and sand in ratio 1: 6
c) Lime is added to cement slurry for the topcoat of plastering to improve the strength of plaster.
d) Rich mix in cement mortar in brick masonry makes the structure unnecessarily rigid.
Consider the following statements in respect of arched construction made of voussoirs: 1) The superimposed load is transferred to the sidewalls only by the strength of cohesion of the mortar between the voussoirs 2) The arch may fail under crushing when the compressive stress or thrust in it exceeds the safe crushing strength of the voussoir material 3) Every element in the arch is subjected to compression only 4) Failure of the arch due to the sliding of any voussoir past the adjacent one due to transverse shear can be avoided by reducing the height of the voussoirs Which of the above statements are correct?
Consider the following statements: 1) Cambium layer is between sapwood and heartwood. 2) Heartwood is otherwise termed as deadwood. 3) Timber used for construction is obtained from heartwood. Which of these statements is/are correct?
Consider the following statements: 1) Strength of brick masonry is influenced by type of mortar. 2) Brick masonry with lime mortar achieves full strength earlier than cement mortar masonry. 3) Mortar strength decides the strength of masonry. Which of these statements is/are correct?
Duration along the critical path defines which of the following ? 1) Shortest duration needed 2) Shortest duration permissible 3) Longest duration needed 4) Longest duration permissible Select the correct answer the using the codes given below:
It is estimated that an activity can be assigned an optimistic duration of 16 days, a pessimistic duration of 28 days and a most likely duration of 19 days. What is the expected duration for this activity?
A project is estimated to costs Rs. 100 million inclusive of 20% thereof as cost direct labour. However, 60% of the labour hours budgeted for is non-productive. If 15% of such wasted labour hours are intended to be curtailed by improved methods of control, then the resulting savings in labour cost would be
There is a task involving 160 m2 of fixing timber formwork for the roof slab of a single-stroyed building. The time earnmarked for completion is four days, working eight hours per day. If a worker’s team consisting of two skilled workers and a unskilled worker can install the formwork at the rate of 1.25 m2/hr, then the number of teams required is
A crawler-tractor weighs 9 ton and a rubber-tyred tractor capable of exerting the same maximum drawbar pull weighs 7.5 ton, 65% of weght of the latter is carried by the two driving wheels. Tractive coefficient for crawler track and rubber tyre is respectively 0.48 and 0.90. Which tractor is more suitable for use where the running surface is concrete?