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TATA STEEL AET EXAM PAPER-2022

TATA STEEL AET EXAM PAPER-2022

1.    Calculate the breakeven stripping ratio of the coal deposits with the following average data points. Cost of overburden removal: INR 200 cu.m. Cost of coal recovery + processing: INR 1000 per tonne. Average market selling price of coal: INR 1800 per tonne.
a.1:4
b.10:1
c.4:1
d.1:10
Ans -c
2.    There is a cylinder filled with gas which has a moveable piston and the piston has a heavy block on it. Total mass of the block and the piston is 25kg. When 3600 J of heat is supplied to the gas, the internal energy of the gas rises by 2800 J. Assuming the region outside the Gas chamber is evaluated calculate the distance by which the piston rises. Assume, g = 10m/s square
a. 2.4m
b.3.2m
c.3.6m
d.4.8m
Ans - b
3.    In an open cast mine, 60 cu.m of overburden was broken by the use of 100 kg of a particular explosive calculate the power factor of the given explosive for the scenario. Given the density of overburden rocks = 1000 kg/cu.m
a.0.16
b.0.60
c.3
d.6
Ans - b

4.    In a coal deposit of seam thickness between 3m -4.5m, the mining company is planning to follow an approach which can result into higher recovery of coal. Which of the given mining method is the best suited in this case?
a. Longwall mining
b. Bord and pillar mining
c. Cut and fill mining
d. Placer mining
Ans - b

5.    Which of the following equipment exhibits a snake like movement?
a.    Shuttle Cars
b.    Armoured Flexible Conveyor
c.    Side Discharge Loader
d.    Continuous Surface Miner
Ans - b
6.    X is a mining method having the following characteristics.1. Ores are blasted from different levels but collected from a level at the bottom.2. Early production of coal is quite low. Which of the given options resembles X?
a.    Block caving
b.    Cut and fill stopping
c.    Longwall mining
d.    Sub- level stopping
Ans - d
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7.    Which of the given parameters is the most sensitive in determining the methane layering number?
a.    Rate of gas emission
b.    Velocity of ventilating airstream
c.    Width of the airway
d.    Number of workers working underground
Ans - a
8.    Which of the given indicators is used to estimate the time period after the first signs of spontaneous heating of coal is observed?
a.    Factor of safety period
b.    Self- oxidation time
c.    Incubation period
d.    Ignition period
Ans - c
9.    Stinkdamp is associated with the presence of which of the given gases?
a.    Methane
b.    Ammonia
c.    Chlorine
d.    Hydrogen sulphide
Ans - d
10.    If the Mohrs circle for a given plane is a point, what does this indicate?
a.    The Normal Stress is zero.
b.    The Shear stress is zero.
c.    The plane is free from both the Normal Stress and shear stress.
d.    None of the above options
Ans - b
11.    Which of the given options is the major source of underground heat in mines?
a.    Heat caused by blasting
b.    Heat caused by machinery
c.    Heat caused by friction of air current
d.    Heat caused by auto- compression of air
Ans -  d

12.    Which of the given softwares offers a streamlined collection of 2D and 3D spatial geoscience data aggregation, visualization, analysis and navigation tools?
a.    GEOVIA surpac
b.    Datamine Discover Suite
c.    XL Miner
d.    AMT Mining Software
Ans - a
13.    Which of the given options is used to rip apart the plant matter from the ground for construction of mines?
a.    Dozer
b.    Motor grader
c.    Dragline
d.    Electric rope shovels
Ans - a
14.    In a  surface mine, if we need to remove 20 cu.m of overburden to achieve two tonnes of ore on an average, which of the given options will be the stripping ratio of the mine?
a.    1/10 tonne/cu.m
b.    20 cu.m/tonne
c.    40 cu.m tonne
d.    10 cu.m/tonne
Ans - d

15.    A barometer gives a reading of 720 mm of Hg at a dry bulb temperature of 25-degree C. Considering the partial pressure of water vapour to be 0.028 bars, which of the given options will be the enthalpy of moist air (in KJ per kg of dry air)?
a.    26
b.    32
c.    42
d.    73
Ans - d
16.    Which of the given options help in controlling the quantity of airflow?
a.    Bulkheads
b.    Regulator
c.    Auxiliary fans
d.    Overcast
Ans - b

17.    In two water samples X and Y, the biological oxygen Demand (BOD) of X is greater than the BOD of Y. Which of the given options is the likely inference that can be drawn from this?
a.    X is more polluted
b.    Y is more polluted
c.    Both the samples are equally polluted
d.    Cannot be determined
Ans - A
18.    Which of the following machines is/are typically used for top-soil removal?
A.    Scraper B. Continuous Surface Miner C. Bucket wheel excavator D. Dragline
i.    A and D
ii.    A, B and D
iii.    A, B, C and D
iv.    A, C and D
Ans -  i

19.    Which of the given outcomes is caused by an improper clip or lashing chain?
a.    Breakage of rope
b.    Detachment of tub from the rope
c.    Roof or side fall
d.    Failure of haulage engine
Ans - b

20.    Given that at a dry bulb temperature of 30 degree C, a barometer gives a reading of 1.04 bars. If the wet bulb temperature is given as 25 degree C, which of the given options will be the specific humidity? Consider the saturation pressure corresponding to WBT to be 0.01366 bar.
a.    9.25 kg/kg of dry air
b.    18 g/kg of dry air
c.    214 g/kg of dry air
d.    5.5 kg/kg of dry air
Ans - b
21.    X is an underground coal mine with the rate of emission of methane of 0.5 cu.m/tonne and 0.5 cu.m/tonne and 0.05% of inflammable gas in the general mine air. Which of the given options will be the degree of gassiness?
a.    Degree I
b.    Degree II
c.    Degree III
d.    Degree IV
Ans - a
22.    Close traversing was done on a mining site to determine the points and angles being covered by a contour line. Shown in the image given below are the blessings noted down in an anticlockwise direction. Which of the given options will be the included angles for the point A, C and D? Also, determine the lowest of them.
 
a.    251 degree 25: 56 degree 47: 140 degree 26: angle C
b.    51 degree 25: 76 degree 47: 120 degree 26: angle A
c.    89 degree 25: 76 degree 47: 12 degree 36: angle D
d.    45 degree 25: 96 degree 34: 120 degree 26: angle A




23.    "The table shown in the image given highlights various failures related to specific hazard modes. Which of the given options matches the given modes and their failure effects correctly?
 a.    1-E, 2-C, 3-D, 4-A, 5-B
b.    1-B, 2-C, 3-D, 4-A, 5-E
c.    1-E, 2-B, 3-D, 4-A, 5-C
d.    1-E, 2-B, 3-D, 4-C, 5-A
Ans - d
24.    Which of the following given symbol represents the control that creates splits in main drift and a second path for air in the development drift?
 Ans - A