GATE MN exam:gate PYQs & Answers — Page 20

Questions 191–200 of 650. Imported answers require independent review unless marked reviewed.

In an opencast coal mine, blast vibrations are measured at two locations, A and B simultaneously for a maximum charge per delay (Q) of 100 kg is given.

Location	Distance from the blast face, D (m)	PPV (mm/s)
A	100	112.5
B	300	20.3

Assume the relation

where, K and

are site constants. The PPV in mm/s, at a distance of 200 m from the blast face, is _____. (round off up to 2 decimals)

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A 35.0 kW motor transmits power to a pulley of 600 mm diameter, which rotates at 400 rpm to drive a flat belt. The tension in the tight side is 2.5 times of the slack side. Neglect all transmission losses. If the maximum allowable tension is 8.0 N per mm of belt width, then the minimum width of the belt in mm, is _____. (round off up to 2 decimals)

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A 1.2 m diameter drum winding system is shown. One of the winding ropes will be replaced for the manwinding cage.

Diagram for Mining Engineering question 63

Consider the following:

A new rope is recapped once at least in every 6 months and a length of 2 m including existing capping is to be cut off from the rope before recapping.

The maximum life of a rope is 3.5 years and at least 2 rounds of rope should remain on the drum while the descending cage lands at the bottom most landing point.

No overwinding will take place during the maximum life of the new rope.

Neglecting the impact of fleet angle on the length of the rope, the minimum length, in m, of new winding rope is _____. (round off up to 2 decimals)

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For a continuous miner (CM) panel, the following data are given.

Data related to CM

Dimension of a working face: 5.0 m (width) x 3.0 m (height) Web depth, m: 0.6 Time for one web cut up to full height, min: 9

Data related to shuttle car

Bucket capacity of shuttle car, tonne: 10 Fill factor: 0.9 Number of cars: 2 Cycle time of each including loading, travel and unloading, min: 6

Assume, unit weight of coal is 1.4 tonne/m³ and its swell factor is 1.2. Consider, 6 working hours per shift.

The non-working time in min, in working hours per shuttle car to dispatch all coal cut by the CM, is _____. (round off up to 2 decimals)

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In a development coal face, 12 holes are drilled and charged with explosive. Holes are initiated with electric delay detonators connected in series. The length of a detonator lead wire is 1.5 m. The length of the blasting cable is 120 m.

Data are as given:

Resistance of each detonator: 1.48 Ω Resistance of lead wire: 0.04 Ω/m Resistance of one wire of the blasting cable: 0.009 Ω/m

The total resistance of the circuit in Ω, is _____. (round off up to 2 decimals)

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The line ran ______ the page, right through the centre, and divided the page into two.

Your answerChoose one option.

across

between

about

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Kind : ______ : : Often : Seldom (By word meaning)

Your answerChoose one option.

Cruel

Variety

Type

Kindred

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In how many ways can cells in a 3 × 3 grid be shaded, such that each row and each column have exactly one shaded cell? An example of one valid shading is shown.

Diagram for Mining Engineering question 3

Your answerChoose one option.

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There are 4 red, 5 green, and 6 blue balls inside a box. If

number of balls are picked simultaneously, what is the smallest value of

that guarantees there will be at least two balls of the same colour?

One cannot see the colour of the balls until they are picked.

Your answerChoose one option.

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Consider a circle with its centre at the origin (O), as shown. Two operations are allowed on the circle.

Operation 1: Scale independently along the x and y axes. Operation 2: Rotation in any direction about the origin.

Which figure among the options can be achieved through a combination of these two operations on the given circle?

Diagram for Mining Engineering question 5

Your answerChoose one option.

Diagram for Mining Engineering question 5 (figure 2)

Diagram for Mining Engineering question 5 (figure 3)

Diagram for Mining Engineering question 5 (figure 4)

Diagram for Mining Engineering question 5 (figure 5)

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GATE MN exam:gate PYQs

Question 61

Question 62

Question 63

Question 64

Question 65

Question 1

Question 2

Question 3

Question 4

Question 5