Friday, January 25, 2013

HPTSB- Diploma -2012- Civil Engineering materials -Question Paper

Hello there,
How you doing?

This  question paper was set by the Himachal Pradesh Takniki Shiksha Board, for the end semester examination Dec 2012 for the Subject of Civil Engg. -3rd semester.

I hope it helps you to prepare for your end semester examinations. Keep looking for the solution of the questions below the list of question paper.

Sub: Civil Engg. Materials                                         Semester : 3rd
Max Marks: 100                                                        Time: 3hrs.

Note: Attempt any five questions

Q.1 (a)Give the classification of the rocks. Give two numbers of examples of each.                  -10marks.
       (b) What are the requirements of a good brick earth.                                                        - -10marks.

Q.2  With a neat and clean sketch, explain the hoffman's kiln.                                                   -20marks.

Q.3 (a)Describe in brief the method of manufacturing of Portland cement.                                -10marks
        (b) Explain the burning of limestone.                                                                                  -10marks

Q.4 (a)Explain the decay of timber and its various causes.                                                        -10marks.
       (b) Explain the structure of the tree.                                                                                   -10marks.

Q.5 (a) Explain the varnishes, its composition and qualities.                                                       - 10 marks
       (b) What are the properties of asbestos?                                                                           -10 marks

Q.6 Explain any two of the following:
       (a) Low heat portland Cement.  (b) POP (c) Oilpaint (d) Plywood                                     -20marks

Q.7 (a) Explain the testing of the cement.                                                                                 -10marks.
        (b) Explain the defects of the timber.                                                                                -10marks.

  • Solutions:
  • Q.1

The rocks are solid masses formed of the various minerals. The rocks form a large part of earth surface and crust. The rocks can be classified in three ways:
   (i) Geological classification
   (ii) Physical classification
    (iii) Chemical classification.

(i) Geological classification is based on the geology of the rock, their way of formation. According to the geology of the formation of the rocks they are classified in the three classes:
  (1) Igneous rocks   (2) Sedimentary rocks   (3) Metamorphic rocks.

(1) Igneous Rocks: Igneous rocks are formed by the solidification of the molten lava present in the crust of the earth. The rock minerals in the earth crust are in molten state due to very high temperature and whenever it gets the opportunity it erupts along a way to the earth surface.

 When it gets the low temperature on the earth surface or below the earth surface it solidifies to different rocks.
 Such rocks are known as the igneous rock. Some rocks are formed on the surface of the earth some are formed at a shallow depth from the earth and some at greater depth and accordingly they are classified into different categories i.e. Volcanic, Hypabyssal and Plutonic rocks.

The rocks formed below the surface of earth have crystalline structure and those formed on the surface of the earth are non crystalline. The example of plutonic rock is Granite, and example of a volcanic rock is Basalt.

(2) Sedimentary Rocks: Sedimentary rocks are formed due to the consolidation of the weathered rock particles. They are formed in the different layers of different matter. The heavier particle sediments settle early,and lighter are settled later, so these kind of rock are generally stratified. The example are the limestone and sandstone.

(3) Metamorphic Rocks: Metamorphic rocks are formed after the metamorphism of the igneous or sedimentary rocks. The rocks change their original properties under the external metamorphic agents like high temperature, pressure etc.

 The example are slate and marble, former obtained from shale and latter from the limestone. Gneiss is another example of it.

(ii) Physical Classification is based on the physical structure of the rocks. They can be classified as
     (1) Stratified Rocks  (2) Non-stratified rocks  and (3) Foliated rocks

(1) Stratified rocks are the rocks which are stratified into different layer and can be seen with naked eyes. The example are the sandstone and shale. Generally all the sedimentary rock are stratified.

(2) Non stratified rocks are the rocks which are stratified but generally a solid mass. All the igneous are generally non-stratified. example are granite and basalt.

(3) Foliated rocks are the rocks which can be separated along a specific direction only. Foliation takes place along a plane generally perpendicular to the direction of the principal stress. Example can be seen in many types of rocks. These rocks are formed after some pressure.

(iii) Chemical classification:
Chemically rocks are again classified into three categories. (1) Calcariious rocks (2)Sicious rocks (3) Argillacious Rocks.

Calcarious rocks are those rocks in which the calcium carbonate is the major mineral. Limestone is the best exapmple.
(2) Silisious rocks are the rocks in which the silica is the major constituent. The example is sandstone.
(3) Argillacious rocks are the rocks in which the alumina is the major constituent.

(Other solutions will be put soon.)

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