laboursonline – MCQs, Mock Tests | Gate GATE Mining Engineering Mcq

In the Coward flammability diagram, the respective percentages of methane and oxygen at the nose limit are

1. 14.2, 0.0
2. 14.1, 18.2
3. 5.8, 12.1
4. 5.0, 19.2

✅ Correct Answer: 3

If the transpose of a matrix is equal to its inverse, then the matrix is

1. symmetric
2. orthogonal
3. skew symmetric
4. singular

✅ Correct Answer: 2

In the Moh's scale of hardness, the minerals in increasing sequence of hardness are

1. calcite, gypsum, topaz, diamond
2. topaz, gypsum, calcite, diamond
3. calcite, gypsum, diamond, topaz
4. gypsum, calcite, topaz, diamond

✅ Correct Answer: 4

In the Moh's scale of hardness, the minerals in increasing sequence of hardness are

1. calcite, gypsum, topaz, diamond
2. topaz, gypsum, calcite, diamond
3. calcite, gypsum, diamond, topaz
4. gypsum, calcite, topaz, diamond

✅ Correct Answer: 4

For a 25 mm diameter spherical charge, the maximum allowable charge length in cm is

1. 15.0
2. 25.0
3. 30.0
4. 150.0

✅ Correct Answer: 1

Long-hole drilling with crater blasting is used for the construction of

1. winze
2. shaft
3. raise
4. decline

✅ Correct Answer: 3

Rill stoping method is a form of

1. block caving
2. artificially supported stoping
3. underhand stoping
4. overhand stoping

✅ Correct Answer: 4

Transit theodolite is a

1. micro-optic theodolite
2. theodolite with face left and face right reading facilities
3. theodolite with stadia hairs
4. theodolite with two vertical circles

✅ Correct Answer: 2

Incubation period is NOT related to

1. crossing point temperature of coal
2. panel size
3. seam thickness
4. explosibility of coal dust

✅ Correct Answer: 4

The pressure on a phreatic surface is

1. less than atmospheric pressure
2. greater than atmospheric pressure
3. equal to atmospheric pressure
4. independent of atmospheric pressure

✅ Correct Answer: 3

Events A and B are independent but NOT mutually exclusive. If the probabilities P(A) and P(B) are 0.5 and 0.4 respectively, then P(A âˆª B) is

1. 0.6
2. 0.7
3. 0.8
4. 0.9

✅ Correct Answer: 1

Among the following options, the specific energy for rock-drilling is lowest in

1. rotary diamond drilling
2. rotary roller drilling
3. percussive drilling
4. jet piercing

✅ Correct Answer: 3

An emulsion explosive of specific gravity 1.25 is used for blasting in an iron ore formation having P-wave velocity of 3000 m/s and specific gravity of 3.20. For an explosive impedance to rock impedance ratio of 0.5, the desired velocity of detonation of the explosive in m/s is

1. 3840
2. 4000
3. 4200
4. 7680

✅ Correct Answer: 1

The number of ways in which the letters in the word MINING can be arranged is

1. 90
2. 18
3. 360
4. 720

✅ Correct Answer: 2

Under standard temperature and pressure conditions the theoretical maximum height in m to which water can be lifted using an air-lift pump is

1. 10.33
2. 9.61
3. 7.45
4. 6.05

✅ Correct Answer: 1

In a belt conveyor system, function of the snub pulley is to

1. clean the inner surface of the belt
2. clean the outer surface of the belt
3. increase the angle of contact of belt with drive drum
4. decrease the belt tension

✅ Correct Answer: 3

Two meshing spur gear wheels of Module 6 have 24 and 42 teeth. The distance in mm between the centres of the gear wheels is

1. 1000
2. 198
3. 126
4. 72

✅ Correct Answer: 2

In an experiment to study coal dust explosibility, it is found that at least 3.0 g of limestone dust should be added to a sample of 2.0 g of coal dust to ensure that propagation of flame does not take place. The explosibility factor of coal dust is

1. 60.00
2. 20.00
3. 6.70
4. 1.50

✅ Correct Answer: 4

A 20 m steel tape used in a mine survey is found to be 20 cm short when compared with a standard tape. If the measured volume of a dump using the tape is 4000 m3, its actual volume in m3 is

1. 3881
2. 3902
3. 3920
4. 4121

✅ Correct Answer: 1

A mine worker inhales normal air; whereas, the exhaled air contains 16.65% O2 and 3.83% CO2. The respiratory quotient of breathing for the worker is

1. 0.23
2. 0.85
3. 0.99
4. 1.13

✅ Correct Answer: 2

The boundary of a mine is plotted on a scale of 1:2000. If a planimeter measures the plotted area as 58 cm2, the actual mine area in m2 is

1. 5800
2. 11600
3. 23200
4. 29000

✅ Correct Answer: 3

For a shrinkage stope the following data values are given Insitu tonnage 9000 tonne Insitu grade 5.2 g/tonne Average grade of waste 1.4 g/tonne Loss of ore in the stope 10% Dilution 20% The grade at the mill-head in g/tonne is ________

1. 4.5 to 4.518
2. 4.2 to 4.215
3. 6.3 to 6.344
4. 1.3 to 1.367

✅ Correct Answer: 1

In an experiment to determine specific gravity of a soil sample, the following data is obtained: Mass of empty pycnometer 20.4 g Mass of pycnometer with soil sample 51.6 g Mass of pycnometer with soil sample filled with water 88.6 g Mass of pycnometer filled with water 70.4 g The specific gravity of the sample is __________

1. 1.25 to 1.35
2. 1.45 to 1.55
3. 3.56 to 3.66
4. 2.35 to 2.45

✅ Correct Answer: 4

A cylindrical rock specimen of diameter 54 mm has Young's modulus of 68.97 GPa and Poisson's ratio of 0.35. The rock specimen fails in uniaxial compression at a lateral strain of 0.01%. The axial load at failure in kN is __________

1. 34.6 to 35.3
2. 44.8 to 45.5
3. 54.7 to 55.3
4. 12.6 to 13.3

✅ Correct Answer: 2

A surface miner with 2.0 m cutting drum width excavates coal in windrowing mode from a bench with effective face length 200 m. The cutting speed of the surface miner is 10 m/min and the cutting depth 25 cm. The density of coal is 1.4 tonne/m3. If the average turning time of the machine at the face end is 5 min, the rate of production in tonne/hour becomes ____________

1. 654 to 656
2. 335 to 337
3. 267 to 269
4. 483 to 485

✅ Correct Answer: 2

A surface miner with 2.0 m cutting drum width excavates coal in windrowing mode from a bench with effective face length 200 m. The cutting speed of the surface miner is 10 m/min and the cutting depth 25 cm. The density of coal is 1.4 tonne/m3. If the average turning time of the machine at the face end is 5 min, the rate of production in tonne/hour becomes ____________

1. 654 to 656
2. 335 to 337
3. 267 to 269
4. 483 to 485

✅ Correct Answer: 2

A core sample of a rock, having diameter 54 mm and length 108 mm, is subjected to axial loading. If the axial strain and Poisson's ratio are 2000 * 10-6 and 0.28 respectively, the value of volumetric strain , represented in micro-strain is ___________

1. 0.000835 to 0.000845
2. 0.000855 to 0.000865
3. 0.000865 to 0.000875
4. 0.000875 to 0.000885

✅ Correct Answer: 4

A bucket wheel excavator with 20 buckets of capacity 0.5 m3 each, rotates at 5 rev/min. The bucket fill factor is 80%. The excavator loads on to 1200 mm wide belt conveyor. The cross-section area (m2) of the material on the belt is 0.1B2, where B is the belt width in m. The minimum speed of the belt in m/s to avoid spillage of material is

1. 7.23
2. 5.79
3. 4.63
4. 3.70

✅ Correct Answer: 3

Given the following, Machine Component P. Dint header 1. Cowl Q. Coal plough 2. Cutting chain R. Road header 3. Loading apron S. Shearer 4. Static set of bits the correct match is

1. P-4,Q-2,R-3,S-1
2. P-3,Q-4,R-2,S-1
3. P-2,Q-3,R-4,S-1
4. P-2,Q-4,R-3,S-1

✅ Correct Answer: 4

Given the following, Equation/formula/law Application P. Bernoulli equation 1. Pressure loss in laminar flow of fluid Q. Poiseuille equation 2. Drag loss due to regular obstructions in fluid flow R. Bromilow's formula 3. Energy conservation in ideal fluid flow S. Stokes law 4. Terminal settling velocity of fine particles in fluid the correct match is

1. P-3, Q-1, R-2, S-4
2. P-1, Q-3, R-2, S-4
3. P-2, Q-3, R-4, S-1
4. P-3, Q-1, R-4, S-2

✅ Correct Answer: 1

Given the following differential equation d2y/dx2 + 7 dy/dx + 12y = 0 the general solution is

1. y = Ae4x + Be-3x
2. y = Ae-4x + Be-3x
3. y = Ae3x + Be-4x
4. y = Ae4x + Be3x

✅ Correct Answer: 2

Given the following, Mining method Technique P Thick seam extraction 1 Double unit face Q Bord and pillar extraction 2 Jet cutting R Longwall face development 3 Inclined slicing S Hydraulic mining 4 Half moon method the correct match is

1. P-3, Q-4, R-2, S-1
2. P-1, Q-4, R-2, S-3
3. P-3, Q-2, R-1, S-4
4. P-3, Q-4, R-1, S-2

✅ Correct Answer: 4

Given the following, Excavating/loading machine Transportation scheme P Bucket Wheel Excavator 1 Mine tub Q Continuous Miner 2 Armoured flexible chain conveyor R Shearer 3 Shiftable Conveyor S Load Haul Dumper 4 Shuttle car the correct match is

1. P-3, Q-2, R-4, S-1
2. P-3, Q-4, R-2, S-1
3. P-3, Q-2, R-1, S-4
4. P-1, Q-4, R-3, S-2

✅ Correct Answer: 2

Given the following, Excavating/loading machine Transportation scheme P Bucket Wheel Excavator 1 Mine tub Q Continuous Miner 2 Armoured flexible chain conveyor R Shearer 3 Shiftable Conveyor S Load Haul Dumper 4 Shuttle car the correct match is

1. P-3, Q-2, R-4, S-1
2. P-3, Q-4, R-2, S-1
3. P-3, Q-2, R-1, S-4
4. P-1, Q-4, R-3, S-2

✅ Correct Answer: 2

The uniaxial compressive strength of a limestone sample is 80 MPa. The sample is confined at a pressure of 20 MPa in a triaxial compressive strength test. Based on Hoek-Brown failure criteria the maximum principal stress at failure in MPa is (consider rock constants as m = 7.88, s = 1.0 and a = 0.5)

1. 11.79
2. 132.3
3. 137.9
4. 157.9

✅ Correct Answer: 4

A wire of length L is cut into two pieces to construct a circle and an equilateral triangle such that the combined area is minimum. The length of the wire used to construct the circle is

1. √3Ï€L/(9 + √3Ï€)
2. 9L/(9 + √3Ï€)
3. L/2
4. 18L/(9 - √3Ï€)

✅ Correct Answer: 1

Pressure characteristic of a mine fan is given by, P = -0.06 Q2 + 400, where P is the pressure in Pa and Q the quantity in m3/s. The resistance of the mine is 0.19 Ns2/m8. The mine quantity in m3/s is

1. 160.0
2. 53.5
3. 45.9
4. 40.0

✅ Correct Answer: 4

Pressure characteristic of a mine fan is given by, P = -0.06 Q2 + 400, where P is the pressure in Pa and Q the quantity in m3/s. The resistance of the mine is 0.19 Ns2/m8. An identical fan is installed in the mine to operate in series with the existing fan. The new mine quantity in m3/s is

1. 75.6
2. 56.7
3. 50.8
4. 30.2

✅ Correct Answer: 3

A 4.6 m wide vein dipping at 800 is mined by horizontal cut-and-fill stoping method. The fill is to be placed in the stope along the length of 46 m and to a height of 3.0 m. If the specific weight of the fill material is 15.86 kN/m3 and the porosity is 35%, under fully saturated conditions the volume of water in the fill in m3 is

1. 222.18
2. 332.40
3. 336.44
4. 634.80

✅ Correct Answer: 1

A 4.6 m wide vein dipping at 800 is mined by horizontal cut-and-fill stoping method. The fill is to be placed in the stope along the length of 46 m and to a height of 3.0 m. If the specific weight of the fill material is 15.86 kN/m3 and the porosity is 35%, under fully saturated conditions the mass of solids in saturated fill in tonnes is

1. 820.00
2. 804.10
3. 799.30
4. 788.80

✅ Correct Answer: 2

All engineering students should learn mechanics, mathematics and how to do computation. I II III IV Which of the above underlined parts of the sentence is not appropriate? I, II, III Iv

1. I
2. II
3. III
4. IV

✅ Correct Answer: 4

Select the pair that best expresses a relationship similar to that expressed in the pair: water: pipe::

1. cart: road
2. electricity: wire
3. sea: beach
4. music: instrument

✅ Correct Answer: 2

Velocity of an object fired directly in upward direction is given by V = 80 - 32 t, where t (time) is in seconds. When will the velocity be between 32 m/sec and 64 m/sec?

1. (1, 3/2)
2. (1/2, 1)
3. (1/2, 3/2)
4. (1, 3)

✅ Correct Answer: 3

In a factory, two machines M1 and M2 manufacture 60% and 40% of the autocomponents respectively. Out of the total production, 2% of M1 and 3% of M2 are found to be defective. If a randomly drawn autocomponent from the combined lot is found defective, what is the probability that it was manufactured by M2?

1. 0.35
2. 0.45
3. 0.5
4. 0.4

✅ Correct Answer: 3

If |-2X + 9| = 3 then the possible value of |-X| - X2 would be:

1. 30
2. -30
3. -42
4. 42

✅ Correct Answer: 2

All professors are researchers Some scientists are professors Which of the given conclusions is logically valid and is inferred from the above arguments:

1. All scientists are researchers
2. All professors are scientists
3. Some researchers are scientists
4. No conclusion follows

✅ Correct Answer: 3