Mining Engineering
GATE MN Mine Ventilation PYQs
Build your understanding with focused practice from past exam papers.
How to practice Mine Ventilation
Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.
Questions 1–10 of 37. Imported answers require independent review unless marked reviewed.
Question 26
Open questionMNMCQ1 markNeeds review
A gradually expanding duct fitted to the outlet of an exhaust fan is known as
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 33
Open questionMNNAT1 markNeeds review
In an underground mine, an airflow of 30 m³ s⁻¹ is delivered through a circular opening having a diameter of 5 m and a length of 500 m. Assuming that there is no change in the surface characteristics, the diameter of the opening, in m, required to double the quantity of airflow at same pressure loss is ____________. (rounded off to two decimal places)
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Open questionMNNAT1 markNeeds review
In an underground mine atmosphere, the alcohol of a Kata thermometer took 60 s to fall from 38 °C to 35 °C. The Kata factor of the thermometer is 480 milli-calories cm⁻². The Kata cooling power, in W m⁻², is ____________. (rounded off to one decimal place)
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 40
Open questionMNMCQ2 marksNeeds review
In an underground coal mine, the air quantities
and
pass through ventilation districts A and B, respectively as shown, with a pressure drop of
across them. The air quantity in district B is to be increased to
by installing a booster fan, as shown, without affecting the air quantity in ventilation district A. The capacity of booster fan (
) can be expressed as 
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 52
Open questionMNNAT2 marksNeeds review
A main mechanical ventilator installed for an underground mine develops a pressure of 25 mm wg. A natural ventilation pressure (NVP) of 15 mm wg acting in the mine aids the ventilator, and a total 500 m
min
of air is circulated in the mine. Considering the same NVP aiding the ventilator, the pressure required, in mm wg, to be generated by the ventilator to circulate 1000 m
min
of air, is ____________. (answer in integer)Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 21
Open questionMNMCQ1 markNeeds review
The figure below shows four profiles of the environmental lapse rate. Given the dry adiabatic lapse rate = −10 °C/km, the atmosphere is highly unstable for the profile
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Open questionMNMCQ1 markNeeds review
In a depillaring face of an underground coal mine, both wet and dry bulb temperatures are 30 °C. The relative humidity of the face environment, in percentage, is
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Open questionMNMCQ1 markNeeds review
Pressure head characteristic of a mine fan and a mine characteristic curves are shown in figure below:
Point | Nomenclature |
|---|---|
P | 1: Stall point |
Q | 2: Operating point |
R | 3: Theoretical shut-off head |
Match the points with their corresponding nomenclatures
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Open questionMNNAT1 markNeeds review
In a ventilation network, three airways with resistances of 4.0 Ns
m
, 6.25 Ns
m
and 9.0 Ns
m
are connected in parallel. The equivalent resistance of the network in Ns
m
is_____ (rounded off to 2 decimal places)Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 40
Open questionMNMCQ2 marksNeeds review
A fixed quantity of air needs to be sent through a cross section, as shown in the figure. The perimeter of the cross section is 20 m. The radius (r) of the semicircle, in m, to minimize the air velocity through the section is
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