Mining Engineering Gate 2017 Questions with Answer

Ques 40 GATE 2017

A mining company having three mines A B and C supplies coal to three power plants P, Q and R located close to the mines. The daily production capacities of the three mines in tonnes are 700, 1200, and 1100 respectively. The daily requirements at the power plants in tonnes are 1000, 1000, and 1000 respectively. The transportation costs in rupees per tonne is given in the matrix below:

Ques 41 GATE 2017

The series-parallel configuration of a system, consisting of 6 independent components A, B, C, D, E, and F with their individual reliability, is shown in the figure:

Ques 42 GATE 2017

500 coal miners were randomly selected from an underground coal mine. It was found that 50 workers experienced an injury in the year 2014. The distribution of injury based on younger age group (age≤40 years) and older age group (age>40 years) generated the following cross classification table.

Ques 43 GATE 2017

A bord and pillar panel is being planned at a depth of 300 m. The dimension of square pillar is 35 m centre-to-centre. The average unit weight of the overburden rock is 25 kN/m³. If the strength of the pillar is 14.0 MPa, the gallery width in m for a safety factor of 1.3 is _____________.

Ques 44 GATE 2017

A sandstone sample having 15% moisture content and volume of 75 cm³ weighs 180 g. If the grain density is 2.6 g/cm³ porosity of the sample in % is

Ques 45 GATE 2017

Let σ₁ and σ₃ are major and minor principal stresses respectively. The equation σ₁=f(σ₃) denotes the failure envelop of a rock as shown in the figure. Match the zones (P, Q. R and S) with the legend code.