Mining Engineering · all questions

Introduction to Mining Engineering
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Q121

In a cut-and-fill stope, the main purpose of back filling is to

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Q122

Maximum Lump size that can be conveyed by belt conveyer is

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Q123

How much time a dragline may take to complete a cycle for a single pass?

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Q124

A narrow vertical or inclined excavation made in the ore block along the width and the height of a stope to continue stoping is termed as

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Q125

Two coal seams are called contiguous if they are A m (maximum) apart from each other. A is given by

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Q126

The sale value of chromite ore from an open pit mine is Rs. 6500 per tonne. Cost of mining, excluding stripping cost, is Rs. 2450 per tonne. If the cost of stripping is Rs. 1150 per m³, the breakeven stripping ratio in m³/tonne is

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Q127

From a hard rock open pit mine, the following data available
Burden : 3 m
Spacing : 4 m
Bench height : 12 m
Sub-drilling : 1 m
Collar stemming : 4 m
Diameter of hole : 150 mm
Density of rock : 2500 kg/m³
Density of explosive : 800 kg/m³
The powder factor in kg/t is

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Q128

As per the Indian Electricity Rules 1956. the maximum permissible length of a flexible cable used with an electric rope shovel in m is

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Q129

The slope angle for hard and compact ground should not be more than

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Q130

The opening cut in open cast mining is known as

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Q131

Advance supporting of 30 m at both the gate roads is required due to

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Q132

A 15 m³ dragline is deployed in an O.B. bench of an O.C. mine. It works for 40 days at the rate of 6 hrs per shift and 3 shifts a day. The cycle time, bucket fill factor, and operating efficiency of the dragline are respectively 50 s, 0.8, and 75%. The total volume of O.B. in m³ handled by the dragline is

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Q133

Mine life time should be calculated based on

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Q134

No mode or type of Capping shall be used which fails to withstand a load of atleast "N" times the maximum static load. N is given by

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Q135

Over 80% of underground coal production in India comes from

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Q136

The following data are provided for a surface mine to be excavated by a shovel:
Production target : 10000 te/shift
Available hours per shift : 6 hrs
Shovel loading cycles per hour : 10⁶
Bank density of the material mined : 2400 kg/m³
Swing factor at 120° swing : 0.91
Bucket fill factor : 0.64
Utilization of available time : 83%
No of working days in a year : 300
No of shifts per day : 3
The annual production target in Mte is

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Q137

Select the correct order with respect to the core sizes

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Q138

A non-electric detonating relay does not contain

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Q139

Which of the following sampling technique is followed during sampling from wagons or dumps in the form of scoop taken at regular intervals?

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Q140

Value of Bulking Factor is

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