Mining Engineering
GATE MN discipline:mining-engineering PYQs
Build your understanding with focused practice from past exam papers.
Questions 431–440 of 650. Imported answers require independent review unless marked reviewed.
Question 31
Open questionMNMCQ2 marksNeeds review
A linear programming problem is stated below.
Maximize
subject to,
The objective function has
Your answerChoose one option.
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Open questionMNMCQ2 marksNeeds review
An explosive mixture has 80 g of ammonium nitrate (NH
NO
) and 14 g of fuel oil (C
H
). The oxygen balance in the mixture isYour answerChoose one option.
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Open questionMNMCQ2 marksNeeds review
A cylindrical sample of cross-sectional area
, length
, and Young’s Modulus
, is subjected to a constant uniaxial load
. Within the elastic limit of loading, the total strain energy stored isYour answerChoose one option.
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Open questionMNNAT2 marksNeeds review
A surface mine production system along with the reliability of the individual components is shown below. The system reliability is ________ (round off to 3 decimal places).
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Open questionMNNAT2 marksNeeds review
The selling price of one rock bolt (in Rs.) is given as,
, where
is the number of bolts produced. The manufacturing cost of rock bolts has a fixed component of Rs. 1500, and a variable component of Rs. 100 per bolt. The minimum break-even production, in number of rock bolts, is ________ (round off to 1 decimal place).Log in to check the answer
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Two underground mines are separated by a horizontal coal barrier of 60 m thickness. One mine is inundated, where the other mine has a blind heading of dimensions 4.0 m wide and 2.5 m height terminating at the barrier. The overall in-situ shear strength of the coal mass is 500 kPa. Assume that the failure mode is in shear. At a factor of safety of 10, the maximum water head that can be withstood by the coal barrier, in m, is ________ (round off to 1 decimal place).
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Open questionMNNAT2 marksNeeds review
Air enters from ambient atmosphere into a level duct of uniform cross-section area 0.2 m
at a flow rate of 2.0 m
/s and density of 1.2 kg/m
. The entry shock loss factor is 1.0 and the resistance of the duct per meter length is 1.0 Ns
/m
. The static pressure measured at a distance of 20 m from the duct entrance in Pa, is ________ (round off to 1 decimal place).Log in to check the answer
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Open questionMNNAT2 marksNeeds review
A sealed-off area air sample consists of 16.0% O
, 3.0% CO
, and the rest is N
. Assume that the standard composition of atmospheric air is 21.0% O
and 79.0% N
. The percentage of blackdamp in the air sample is ________ (round off to 2 decimal places).Log in to check the answer
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Open questionMNNAT2 marksNeeds review
A diesel loader produces 60 l/s of exhaust fumes containing 500 ppm of CO. The incoming air has 10 ppm of CO. The minimum amount of air flow in m
/s that is needed at the loader to dilute CO to a permissible level of 50 ppm is ________ (round off to 1 decimal place).Log in to check the answer
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Open questionMNNAT2 marksNeeds review
The equation for peak particle velocity (PPV) from blast induced ground vibration is given by
, where
and
are site constants.In a field study, the following readings are recorded.
Sensor No. | PPV in mm/s | Sensor distance from blast site (D) in m | Charge per delay (Q) in kg |
|---|---|---|---|
1 | 5.5 | 200 | 100 |
2 | 3.4 | 300 | 100 |
The value of
is ________ (round off to 3 decimal places).Log in to check the answer
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