Mining Engineering
GATE MN year:2025 PYQs
Build your understanding with focused practice from past exam papers.
Questions 21–30 of 65. Imported answers require independent review unless marked reviewed.
Question 21
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The figure below shows four profiles of the environmental lapse rate. Given the dry adiabatic lapse rate = −10 °C/km, the atmosphere is highly unstable for the profile
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In a depillaring face of an underground coal mine, both wet and dry bulb temperatures are 30 °C. The relative humidity of the face environment, in percentage, is
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The chemicals used in a foam type fire extinguisher are
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Pressure head characteristic of a mine fan and a mine characteristic curves are shown in figure below:
Point | Nomenclature |
|---|---|
P | 1: Stall point |
Q | 2: Operating point |
R | 3: Theoretical shut-off head |
Match the points with their corresponding nomenclatures
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As per CM 2017, haulage ropes shall be recapped once at least in every
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In a shovel dumper combination, the loading time of a dumper is 3 minutes. The shovel serves 8 dumpers. If the cycle time of a dumper including its loading time is 22 minutes, the waiting time of a dumper, in minute, is_____ (in integer)
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An HMX explosive having Velocity of Detonation (VOD) of 10500 m/s is tested by D’Autriche method with a detonating fuse of VOD 7000 m/s, as shown in the figure. The impression mark on lead plate will be obtained at a distance (L), in m, from the mid point of the fuse, is ___ (rounded off to two decimal places)
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Hydraulic fracturing method is used to determine the major principal stress (
) in an underground rock strata having tensile strength of 6 MPa. The minor principal stress (
) in the strata is 8 MPa. If fluid pressure of 10 MPa is required to fracture the vertical bore in that strata, the magnitude of
, in MPa, is _____ (rounded off to 2 decimal places)Log in to check the answer
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The value of
is, _____ (rounded off to 1 decimal place)Log in to check the answer
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The box plot of a data set is shown below
The interquartile range of the data set is_____ (in integer)
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