Mining Engineering Gate 2019 Questions with Answer

Ques 53 GATE 2019

Three equipment A, B, and C located side by side and operating simultaneously produce a sound power level of 77.5 dB. The sound power levels of A and B are 68 dB and 70 dB respectively. The sound power level of C (rounded off to one decimal place) in dB, is __________.

Ques 54 GATE 2019

The main surface fan of a mine as shown in the figure, has characteristic curve approximated by P=1700-10Q where P is pressure in Pa and Q is quantity in m³/s. A booster fan is installed in section A such that there is no air flow in section B. The operating pressure of the main surface fan, in Pa, (rounded off to two decimal places) is ________.

Ques 55 GATE 2019

Two points A and B are located 150 m apart in the East-West orientation on the bank of a river as shown in the figure. Considering a station C on the north bank the bearings of AC and BC are observed to be 42° and 335° respectively. The width of the river, in m, (rounded off to two decimal places) is _________.

Ques 56 GATE 2019

A pump delivers 3000 liter of water in 2.0 minutes through a pipe of length 1000 m laid on a gradient of 1 in 10. The combined efficiency of pump and motor is 70%. If friction and shock losses are negligible, the input power to the motor in kW (rounded off to one decimal place) is _________.

Ques 57 GATE 2019

A sand water slurry of specific gravity 1.45 contains sand of grain density 2.6 g/cc. The weight percent of sand in the slurry (rounded off to two decimal places) is _________.

Ques 58 GATE 2019

For a mining company the unit transportation cost from a mine to a washery, and supply and demand are shown below:

Ques 59 GATE 2019

In a bord and pillar panel, 6 square pillars are developed as shown in the figure below. The depth of the seam is 300 m and the average unit weight of overburden rock is 25 kN/m³ If the pillar strength is 15 MPa, the safety factor of the shaded pillar zone (round off to two decimal places) is _________.

Ques 60 GATE 2019

Water enters a sump having the shape of an inverted frustum at a rate of 500 m³/h. The sump is initially filled up to 2.0 m height. The time taken in days to fill the remaining part of the sump (rounded off to one decimal places) is _______.

Ques 61 GATE 2019

The uniaxial stress-strain behavior of a rock sample is shown in the figure. The elastic modulus E is 20,000 MPa. If ε_p is the plastic strain, the value of the damage parameter D (rounded off to two decimal place) is ____________.

Ques 62 GATE 2019

The insitu stress field around a circular tunnel is shown in the figure. Points A and B are located at the boundary of the tunnel. If the tangential stress at Point A is 3 times of that at Point B, the value of insitu stress ratio, k is ________.

Ques 63 GATE 2019

Data related to explosive and blasthole are given below. Assuming 1 kcal to be 4.2 kJ, the power of explosive in GW in the blasthole (round off to one decimal place) is ______.

Ques 64 GATE 2019

A rock block of mass 100 kg is to be lifted by a horizontal force P as shown in the figure below. Smooth rollers are placed between the wedges. The coefficient of static friction between wedge A and surface C and between wedge B and surface D is 0.3. Ignoring the weight of the wedges and the friction between the roller and the wedges, the minimum force P in kg required to lift the block (round off to one decimal place) is ________.

Ques 65 GATE 2019

A joint plane dipping at 30° intersects the slope edge and the crest as shown in the figure below. The unit weight of rock is 25 kN/m³, and cohesion and friction angle of the joint surface are 40 kPa and 25° respectively. The safety factor of the shaded block (round off to two decimal places) is __________.