Question 1
________ is not use to make Portland Cement (PC).
A. Calcareous Rocks
B. Argillocalcareous Rocks
C. Argillaceous Rocks
D. Sand
View Answer
Answer: Option D
Explanation:
Sand is mixed with Cement to make concrete instead of making cement. Materials which we get from these 3 rocks are useful to make healty PC.
Question 2
As the materials pass through the kiln their temperature is rised upto ____
A. 1300-1600 °C
B. 1100-1500 °C
C. 1300-1500 °C
D. 1100-1600 °C
View Answer
Answer: Option A
Explanation:
1300-1600 °C is the best range to melt the raw materials for a healty PC. Below 1300 °C the materials whcih we added to make PC won’t melt perfectly and the result will be unhealty PC.
Question 3
Cement is a material with adhesive and cohesive properties.
A. True
B. False
View Answer
Answer: Option A
Explanation:
Cement is a material with adhesive and cohesive properties which make it capable of bonding mineral fragments into a compact whole.
Question 4
Prepared raw mix is fed into the rotary kiln.
A. True
B. False
View Answer
Answer: Option A
Explanation:
Cement kilns are used for the pyroprocessing stage of manufacture of Portland and other types of hydraulic cement, in which calcium carbonate reacts with silica-bearing minerals to form a mixture of calcium silicates.
Question 5
What is the composition of making the Mortar?
A. P.C. + Water
B. P.C. + Water + Sand
C. P.C. + Water + Sand + Gravel
D. Water + Sand + Gravel
View Answer
Answer: Option B
Explanation:
Mortar is a mixture of 3 materials i.e. cement, water and sand (P.C. + sand + water = Mortar), used in building for holding bricks or stones together.
Question 6
What is the diameter and length of the kiln respectively?
A. 6m and 200m
B. 200m and 6m
C. 6m and 6m
D. 200m and 200m
View Answer
Answer: Option A
Explanation:
They are produced in a range of sizes and units with diameters up to 6 m and lengths up to 200 m have been made.
Question 7
What is the diameter of Clinker for making of Portland Cement?
A. .15-5 cm
B. .15-5 m
C. .3-4 cm
D. .3-4 m
View Answer
Answer: Option A
Explanation:
As the materials pass through the kiln their temperature is rised upto 1300-1600 °C. The process of heating is named as “burning”. The output is known as “clinker” which is 0.15-5 cm in diameter.
Question 8
What is the percentage of CLINKER in PC?
A. 2-3%
B. 4-6%
C. 2-6%
D. 3-5%
View Answer
Answer: Option C
Explanation:
Portland cement is made by mixing substances containing CaCO3 with substances containing SiO2, Al2O3, Fe2O3 and heating them to a clinker which is subsequently ground to powder and mixed with 2-6 % gypsum.
Question 9
What is the range of CaCO3 in Argillocalcareous Rocks?
A. >75%
B. 40-75%
C. <45%
D. 75%
View Answer
Answer: Option B
Explanation:
It is the standard value for in Argillocalcareous Rocks (40-75% CaCO3 such as clayey limestone, clayey marl).
Question 10
Which one doesn’t comes under Calcareous Rocks?
A. Limestone
B. Cement rock
C. Chalk
D. Marine shell deposits
View Answer
Answer: Option B
Explanation:
Cement Rock comes in Argillocalcareous Rocks. And Calcareous Rocks have Limestone, Marl, Chalk, Marine Shell Deposits.