Mining Engineering Gate 2022 Questions with Answer

Ques 40 GATE 2022

The modified Lauffer diagram as shown in the figure relates to roof span, RMR and stand-up time. In a metal mine, roof span of a drive is 4 m. If the RMR of the rock mass changes from 40 to 60, then the stand-up time increases by a factor of __________.(round off to two decimal places)

Ques 41 GATE 2022

In a friction winder, the skip accelerates to a steady speed over a time span of 15 s from the start. The torque vs. time diagram for the winding cycle is shown in the figure. The deceleration time in seconds is ____________. (round off to one decimal place)

Ques 42 GATE 2022

At a measurement station, the air quality parameters PM_2.5, NO₂ and O₃ have the AQI sub-index values as 180, 96, and 84, respectively. The AQI for the station is __________. (in integer)

Ques 43 GATE 2022

Match the drilling pattern with mining operation

Ques 44 GATE 2022

A 3-point borehole extensometer is installed to identify the location of a single discontinuity plane in a hanging wall rock by measuring deformations at three locations as shown in the figure. The absolute readings of deformations measured on two different dates are listed in the table. Based on the measured data the most likely inference is

Ques 45 GATE 2022

Match the semi-variogram shape with the model name and the property Shape Q P Semi-variogram model Property

Ques 46 GATE 2022

In a uniaxial compressive strength test, a rock sample of diameter 50 mm fails at an angle of 60° as shown in the figure. If the peak load at failure is 120 kN, the normal and shear stresses on failure plane respectively, in MPa are __________ and ________.

Ques 47 GATE 2022

A coal mining company examines the option of buying two types of dumpers with the following details.

Ques 48 GATE 2022

Following information is given for a drilling operation to be carried out for overburden removal in a surface mine.

Ques 49 GATE 2022

The shaft-top coordinates of two vertical shafts A and B are given below. The depth of the shaft A and B are 200 m and 149 m, respectively.

Ques 50 GATE 2022

The oxygen-balanced equation for explosive ANFO is given below.
3NH₄NO₃+CH₂→7H₂O+CO₂+3N₂
For 100 litre of fuel oil having density 850 kg/m³ the amount of ammonium nitrate to be mixed, in kg, is (round off to two decimal places)

Ques 51 GATE 2022

Two weightless cables of equal length and cross sectional area are hanging from a ceiling as shown in the figure. They are connected by a horizontal light bar of length 1.0 m and pulled by a force, F. The modulus of elasticity of Cable-1 and Cable-2 are 50 GPa and 200 GPa, respectively. If the deformation in both the cables is equal, the distance x, in m is _____________. (round off to one decimal place)

Ques 52 GATE 2022

A circular tunnel of radius 3 m is constructed in a hydrostatic stress field of 15 MPa. The modulus of elasticity and Poisson's ratio of the rock are 5 GPa and 0.25, respectively. A uniform support pressure p_i is applied at tunnel boundary to restrict the radial deformation at the tunnel boundary to 4 mm. The value of p_i in MPa is __________. (round off to two decimal places)