Mining Engineering Gate Yearwise 


Mining Engineering Gate 2019 Questions with Answer

Ques 27 GATE 2019

For a regionalized variable Z(x), at a lag distance h, the empirical semi-variogram γ(h) is given by

A

E[Z(x)-Z(x+h)]2

B

1/2 E[Z(x)-Z(x+h)]2

C

1/2 E[{Z(x)-E(Z(x))}×{Z(x+h)-E(Z(x+h))}]

D

E[{Z(x)-E(Z(x))}×{Z(x+h)-E(Z(x+h))}]


(b) is the correct answer.

Ques 28 GATE 2019

Respirable dust in an underground coal mine contains 4.5% free silica. As per the CMR 2017, the maximum allowable respirable dust concentration, in mg/m3, in the mine air is

A

1.5

B

2.0

C

2.5

D

3.0


(b) is the correct answer.

Ques 29 GATE 2019

The purpose of rotating a whirling hygrometer in hygrometric survey is to

A

wet the cotton wick with water thoroughly

B

maintain constant temperature of water in the container

C

create steady state evaporation of moisture from the wet bulb surface

D

prevent the heat produced by the cap lamp of the observer from affecting the readings


(c) is the correct answer.

Ques 30 GATE 2019

Stone dust barriers in underground coal mines are used to arrest

A

black damp explosions

B

air blast

C

firedamp explosions

D

coal dust explosions


(d) is the correct answer.

Ques 31 GATE 2019

The correct sequence of attachments between the winding rope and the cage in a drum winding system is

A

Triangular plate → Rope capel→ Bull chain → Detaching hook → Cage chain

B

Rope capel→ Bull chain → Triangular plate → Detaching hook → Cage chain

C

Detaching hook → Rope capel→ Bull chain Cage chain → Triangular plate

D

Rope capel→ Detaching hook → Bull chain → Triangular plate → Cage chain


(d) is the correct answer.

Ques 32 GATE 2019

The functions of automatic contrivances in a winding system are to prevent

A

over-speeding and over-winding

B

slow banking and load balancing

C

over loading and load balancing

D

over-speeding and load balancing


(a) is the correct answer.

Ques 33 GATE 2019

A low-grade deep-seated ore body dipping at 70° has a strike length of 2 km, and width of 100 m. The ore body and wall rocks are weak and fractured. The preferred method of mining is

A

shrinkage stoping

B

cut-and-fill stoping

C

block caving

D

room and pillar stoping


(c) is the correct answer.

Ques 34 GATE 2019

If the figures A and B represent contour plots in a terrain, then the correct statement is

A

Fig. A shows ridge and Fig. B shows valley

B

Fig. A shows anticline and Fig. B shows syncline

C

Fig. A shows syncline and Fig. B shows anticline

D

Fig. A shows valley and Fig. B shows ridge.


(a) is the correct answer.

Ques 35 GATE 2019

The availability of water in the root zone for plant use is maximum in the case of

A

sand

B

loam

C

clay

D

gravel


(b) is the correct answer.

Ques 36 GATE 2019

If the time to failure of a machine component is exponentially distributed, the reliability of the same at Mean Time To Failure (MTTF), (rounded off to three decimal places), is ________.


(0.350) is the correct answer.

Ques 37 GATE 2019

The major and minor principal stresses at a point are 25 MPa and -5 MPa respectively. The maximum shear stress, in MPa at that point is __________.


(15) is the correct answer.

Ques 38 GATE 2019

Proximate analysis of a coal sample gives 2.46% moisture, 25.73% volatile matter, and 42.89% ash. The volatile matter of the coal sample, in percentage, on dry ash free (daf) basis (rounded off to two decimal places) is ____________.


(46.00) is the correct answer.

Ques 39 GATE 2019

A coarse sand aquifer has porosity 20% and hydraulic conductivity 3.5×10-3 m/s. If the hydraulic gradient is 0.00423 (m/m) then the average linear velocity of the groundwater in mm/s. (rounded off to three decimal places) is ___________.


(0.070) is the correct answer.

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