FREE Bachelor of Civil Engineering Questions and Answers
Pure limestone is calcined to produce a substance known as:
Pure limestone is used to make quick lime. It is made up of calcium oxides and is not crystalline. Fat Lime is also known by the names Pure Lime and Rich Lime. Another name for Poor Lime is Lean Lime.
What form(s) of lime should be included in the brick earth?
To prevent bricks from flaking, lime needs to be present in the brick earth as a very finely ground powder.
Why is natural cement only occasionally used?
When water is added, natural cement hardens very quickly, making it difficult to work with. This should be substituted with artificial cement.
Which of the ensuing pairings is correctly matched?
Lime is divided into Class A, B, and C according to the amount of CaCO3 in the limestone. There is no class D; class A is used for masonry construction; class C is used for whitewashing.
How many different components make up brick earth?
There are 5 essential components for an excellent brick earth. They are alumina, silica, lime, iron oxides, and magnesium oxides.
Which of the following is the component of brick earth that is most crucial?
Raw bricks are protected from cracking and warping by the 50–60% silica content of brick soil.
Which feed type kiln does not have fuel contact with limestone?
Only 2 types of kiln feed are available: mixed and separate. Fuel and limestone are combined during burning in the mixed feed type.
The temperature at which the calcination reaction's standard Gibbs free energy is zero is known as:
For phase transitions, there is a transition temperature. Absolute temperature is gauged in relation to zero. The temperature below zero is considered to be negative.
How is the configuration in a clamp if coal is the fuel?
They are piled in an alternate layer if wood provides the fuel. Coal or charcoal is thrown in a heap after being mixed with limestone.
How can one comprehend the finish of lime burning?
A blue flame denotes complete combustion, which implies no resource wasted. We can therefore guarantee that lime is burned properly.
Which of the following methods is used to obtain lime?
It isn't present naturally. It is made by igniting limestone, seashells, and boulders of limestone that were once riverbeds.
Which of the following is the initial step in the brick earth preparation process?
The process of making bricks includes a phase called site selection. Unsoiling is the initial step in the process of preparing the ground for bricks. It entails removing the top layer, which is 150–250 mm deep.
Why is the weathering process carried out?
By adding a little water to the clay after it has been dug out, weathering involves making the clay softer. It is heated after that and left to weather for a few weeks.
What does "soundness of cement" mean?
There shouldn't be any volume changes when the cement paste cures and hardens. This is made sure of and tested utilizing the autoclave expansion test.
Who and when invented Portland cement?
Portland cement was invented in 1824 by Joseph Aspdin. Due to advancements he made in the 1840s, William Aspdin, his son, is credited with creating modern Portland cement.
The period of time from the addition of water till the paste stops acting like a fluid is referred to as:
The amount of time needed for cement paste to reach its final setting point is measured in hours. Option c and d are not possible.