Mining Engineering Gate 2025 Questions with Answer

Ques 27 GATE 2025

In a bord and pillar panel, the following data are obtained:
Number of blasting rounds per shift: 8
Face dimension (m×m): 4.2×2.5
Average pull (m): 1.2
Specific gravity of coal: 1.4
Manpower per shift: 100
The OMS (output per manshift) of the panel, in tonne, is ______ (rounded off to 2 decimal places)

Ques 28 GATE 2025

If the in-situ density of coal is 1320 kg/m³ and the density of blasted coal is 952 kg/m³, the swell factor is ______ (rounded off to 3 decimal places)

Ques 29 GATE 2025

A continuous miner serves two shuttle cars of 12 tonne capacity each. Shuttle cars I and II operate with a total cycle time of 12 minutes and 15 minutes respectively, which includes loading time of 8 minutes for each car. The production rate of the continuous miner, in tonne/hour, is ______ (rounded off to 2 decimal places)

Ques 30 GATE 2025

A pit slope has the following information:
Number of benches =5
Height of each bench =8m
Bench slope angle =70 degree
If width of one bench is 24 m and that of other four benches is 10 m each, the overall pit slope angle, in degree, is ______ (rounded off to 2 decimal places)

Ques 31 GATE 2025

A double ended ranging drum (DERD) shearer uni-directionally cuts coal in a longwall panel having the following details:
Shearer drum diameter =1.4m
Panel dimension =1200m×200m×2.4m
Web depth =0.6m
Average cutting speed =5 m/minute
Average retreating speed =10 m/minute
Average operational delay between cuts is 2 hour. There are two production shifts, each of 8 hour duration. The number of days required for complete extraction of the panel is ______ (in integer)

Ques 32 GATE 2025

The chemicals used in a foam type fire extinguisher are

Ques 33 GATE 2025

Average noise level at a working place is 80 dB(A) for the first 10 minutes and 60 dB(A) for the next 30 minutes. The energy equivalent continuous noise level at the place for the entire period of 40 minutes, in dB(A), is ______ (rounded off to 2 decimal places)

Ques 34 GATE 2025

A longwall panel is to be developed in a flat seam at a depth of H m. The surface subsidence profile (s) of the area with the horizontal distance x is estimated as
s = S_max/2 [1.002-tanh(4.8x/H)]
where, S_max is the maximum subsidence at the centre of the panel, x is measured from the inflection point. The value of x is negative towards the panel centre and positive towards the panel boundary.
The ratio between the critical width of the panel and the depth is ______ (rounded off to 2 decimal places)

Ques 35 GATE 2025

Three frictionless pulleys with rope attachment are in a static equilibrium as shown in the figure. The mass m₁ and m₂, in kg, respectively are

Ques 36 GATE 2025

A direct rope haulage has the following details:
Output=24 tonne/hour
Length of trip =610m
Gradient 1 in 12
Capacity of mine car =1.0 tonne
Tare weight of mine car =0.5 tonne
Average rope speed =1.694 m/s
Change over time of cars =3 minute
Acceleration due to gravity =10.0 m/s²
Neglecting all frictional resistance and mass of the rope, the minimum power required, in kW, to raise the loaded mine cars is ______ (rounded off to 3 decimal places)

Ques 37 GATE 2025

A 2.5 tonne diesel locomotive hauls 5 mine cars upslope having a gradient of 1 in 20. The constant tractive force of the locomotive is 1800 kN. The gross weight of a car is 3 tonne. Acceleration due to gravity is 10.0 m/s². If the acceleration of the system is 0.5 m/s², the rolling resistance in kN/tonne is ______ (rounded off to 3 decimal places)

Ques 38 GATE 2025

The safety device used to arrest forward runaway tubs in rope haulage, is

Ques 39 GATE 2025

The percent Fe content of a random sample consisting of five observations is shown.
64, 63, 60, 61, 62
If mean grade of the stockpile is estimated using the above data, the standard error of mean grade, in %, is ______ (rounded off to 3 decimal places)