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CIL MT Coal Preparation Exam -2025 Paper

1.     Which of the following sentences is/are correct?

Statement A: Pressure drop in a pipeline is directly proportional to the length of the pipe

Statement B: In laminar flow, pressure drop varies with the square of velocity.

          A.     Statement A is false, but statement B is true.

B.     Both Statement A and Statement B are false.

C.     Statement A is true, but Statement B is false

D.     Both Statement A and Statement B are true.

Ans. C

2.     What is the typical use of slurry pumps in mineral processing?

A.     To add reagents to the slurry

B.     To filter fine particles from the slurry

C.     To increase the concentration of valuable minerals in the slurry

D.     To circulate the slurry for separation processes like flotation

Ans. D

3.     Select the correct option with respect to the the following statements.

Statement A: the E-curve represents the probability distribution of residence times of fluid elements in a reactor.

Statement B: A perfectly mixed continuous stirred tank reactor (CSTR) exhibits a narrow E-curve, indicating uniform residence time for all fluid elements.

A.     Statement A is false, but statement B is true.

B.     Both statement A and Statement B are true.

C.     Both statement A is true, but statement B is false.

D.     Both Statement A and Statement  B are false.

Ans. C

4.     Which of the following is a common physical coal cleaning method that utilizes the density difference between coal and impurities?

A.     Magnetic separation

B.     Gravity separation

C.     Flotation

D.     Oil agglomeration

Ans. B

5.     Which of the following correctly represents the three stages of annealing?

A.     Soaking, Quenching, Hardening

B.     Recrystallisation, Austenitisation, Quenching

C.     Heating, Soaking, Slow Cooling

D.     Cold Working, Tempering, Slow Cooling

Ans. C