Online MiningFMC- Mine Ventilation, Fires, Explosion & Inundation Last Year Question Paper
FMC- Mine Ventilation, Fires, Explosion & Inundation
Question Text:
1 Bar pressure is equivalent to
Options:
1. 1 kPa
2. 10kPa
3. 100 kPa
4. 1000 kPa
5. None of the Options
Correction Answer : Option No.(3)
Question Text:=
Choose the correct statement
Options:
1. Rate of diffusion of gases into air is directly proportional to their densities.
2. Rate of diffusion of gases into air is directly proportional to the square root of their densities.
3. Rate of diffusion of gases into air is inversely proportional to their densities.
4. Rate of diffusion of gases into air is inversely proportional to the square root of their densities.
5. None of the Options
Correction Answer : Option No.(4)
Question Text:
Jones – Tricket ration of 0.4 indicates
Options:
1. No fire
2. Wood fire
3. Coal fire
4. Oil fire
5. No any indication
Correction Answer : Option No.(1)
Question Text:
The average concentration of respirable dust in mine atmosphere during each shift, to which person is exposed at any working is shall not exceed _______ Where the free silica in air borne dust is ________ or less.
Options:
1. 2 mg/m3 and 3%
2. 3 mg/m3 and 5%
3. 5 mg/m3 and 5%
4. 3 mg/m3 and 3%
5. 2 mg/m3 and 5%
Correction Answer : Option No.(2)
Question Text:
Ratio of CO2 given off to O2 consumed by the human being is called
Options:
(1) Life quotient
2. Life survival ration
3. Oxidation ration
4. Respiratory quotient
5. None of the Options
Correction Answer : Option No.(4)
Question Text:
When coal is burnt with insufficient supply of oxygen, _____________ Is formed?
Options:
1. carbon dioxide
2. carbon peroxide
3. carbon monoxide
4. carbon tetraoxide
5. methane
Correction Answer : Option No.(3)
Question Text:
In a ventilating district, wet bulb temperature is found to 32° C, the air velocity should not be less than
Options:
1. 0.5 m/sec
2. 1 m/sec
3. 45 m/ min
4. 75 m/ min
5. None of the Options
Correction Answer : Option No.(2)
Question Text:
What is the physiological effect of 0.2% CO inhalation by human?
Options:
1. Death in 5 min.
2. Palpitation and giddiness
3. Headache and collapse
4. Death in 10 min.
5. Death in 1 min.
Correction Answer : Option No.(4)
Question Text:
The period of time that elapses between the application of an ignition source and appearance of the flame is called
Options:
1. Ignition time
2. Incubation period
3. Lag on ignition
4. Fire time
5. Explosion time
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Correction Answer : Option No.(3)
Question Text:
Gas chromatography separates and analyse components of gas mixture by
Options:
1. adsorbant
2. Molecular species
3. Boiling water
4. Catalyst
5. None of the Options
Correction Answer : Option No.(2)
Question Text:
Why nitrogen flushing is done in mines?
Options:
1. To increase the % of nitrogen
2. Remove CO from sealed off area
3. To reduce the % of oxygen in the area
4. To improve ventilation of mine
5. To clear blasting fumes from the face
Correction Answer : Option No.(3)
Question Text:
What is full form of FLP?
Options:
1. Fast Leakage Process
2. Flameproof
3. Fire Leakage Process
4. First Lighting Process
5. Fire Lighting Potential
Correction Answer : Option No.(2)
Question Text:
Gravimetric dust sampler is used for
Options:
1. Measuring gravitational force
2. Air sampling
3. Removing dust from air
4. Dust sampling
5. Respirable air borne dust sample
Correction Answer : Option No.(5)
Question Text:
Why auxiliary fan is used in underground mine ?
Options:
1. To increase overall quantity of air in district
2. To improve working condition of the working face
3. To decrease resistance in airway
4. To increase overall quantity of air in district and to improve working condition of the working face
5. To increase overall quantity of air, to improve working condition of the working face and to decrease resistance in airway
Correction Answer : Option No.(2)
Question Text:
Which of the following is not a type of mechanical ventilator?
Options:
1. Axial-Flow fan
2. Uni-axial fan
3. Turbo- axial fan
4. Radial -flow fan
5. None of the Options
Correction Answer : Option No.(2)
Question Text:
At what scale the Dust Plan is prepared and maintained, at every mine having working belowground ?
Options:
1. Not less than 1-2500
2. Not less than 1-4000
3. Not less than 1-2400
4. Not less than 1-5000
5. None of the Options
Correction Answer : Option No.(3)
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Question Text:
A man while doing hard work, breathes 60 x 10 -3 m3 of air per minute. Amount of oxygen consumed by him will be:
Options:
1. 12.57 x 10-3 m3
2. 11.56 X 10-3 m3
3. 13.75 X 10-3 m3
4. 11.65 X 10-3 m3
5. None of the Options
Correction Answer : Option No.(1)
Question Text:
Distance of main mechanical ventilator of the mine from the opening of the shaft or incline at any point, shall be
Options:
1. less than 10m
2. Not less than 10 m
3. At the opening of the shaft or incline
4. 15 m
(5) 12 m
Correction Answer : Option No.(2)
Question Text:
To reopen a mine or part thereof, which has been isolated, sealed off or flooded with water to deal with a fire:
Options:
1. A prior permission in writing from Chief Inspector is required
2. A notice is required to be given, not less than 14 days before the commencement of work
3. A prior permission in writing from Regional Inspector is required.
4. A notice is required to be given, not less than 07 days before the commencement of work
5. A notice is required to be given, not less than 72 hrs before commencement of work
Correction Answer : Option No.(2)
Question Text:
At what interval examination of rate of emission of inflammable gas in cubic meters per tonne of coal raised shall be done?
Options:
1. 15 days
2. 7 days
3. 30 days
4. 45 days
5. 10 days
Correction Answer : Option No.(3)
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Question Text:
If a volume of 20 cm3 air sample is analysed with Haldane apparatus, and the volume remained after absorption of CO2 is 18.65 cm3. What is the percentage of CO2 present in the air sample?
Options:
1. 5.65%
2. 6.55%
3. 7.65%
4. 5.76%
5. 6.75%
Correction Answer : Option No.(5)
Question Text:
Which of the following fan testing method is more accurate?
Options:
1. Field test
2. Rating test
3. Air quantity test
4. Efficiency test
5. Mechanical test
Correction Answer : Option No.(2)
Question Text:
FMC- Mine Ventilation, Fires, Explosion & Inundation
For what purpose the Smoke-cloud Generator is used?
Options:
1. For air quantity survey
2. For pressure survey
3. For sending emergency warning
4. To generate electricity
5. None of the Options
Correction Answer : Option No.(1)
Question Text:
Which is not the advantage of axial flow fan
Options:
1. Requires less space for installation
2. Smaller and cheaper foundation
3. Reversal easier by reversal switch
4. Quantity controllable by varying the pitch of the plates
5. Suited for high water gauze and high quantity
Correction Answer : Option No.(5)
Question Text:
Stone dust barriers are normally required in
Options:
1. Degree-I
2. Only in Degree-II
3. Only in Degree-III
4. Both Degree-II and III
5. Degree-I, II and III
Correction Answer : Option No.(4)
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Question Text:
If any sampling detects respirable dust concentration of 4.6 mg/m3 and free silica content is 4%, then futher sampling should be done within or not exceeding
Options:
1. 6 months
2. 3 months
3. 2 months
4. 1 month
5. 2Weeks
Correction Answer : Option No.(2)
Question Text:
In a longwall face, % of methane at intake and return gates indicate 0.1 % and 0.4 %, air quantity flowing at the face is 1800 m3/ min, production from the face is 1500 TPD, methane emission rate in m3/tonne of coal output is equal to
Options:
(1) 0.0864
2. 0.864
3. 5.184
4. 8.64
5. 9.08
Correction Answer : Option No.(3)
Question Text:
Explosibility of coal dust generally does not depends on
Options:
1. Fineness of dust
2. Composition of dust
3. Presence of methane in air
4. Colour of dust
5. None of the Options
Correction Answer : Option No.(4)
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Question Text:
A 10% increase in cross sectional area of a roadway will reduce the resistance approximately by
Options:
1. 11%
2. 21%
3. 33%
4. 40%
5. None of the Options
Correction Answer : Option No.(2)
Question Text:
The most important parameter of a dust that governs its physiological effect is
Options:
1. Concentration of dust in air
2. Shape of dust
3. Time of exposure
4. Size of dust
5. None of the Options
Correction Answer : Option No.(4)
Question Text:
Atkinson's equation P = RQ2 is applicable for
Options:
1. Laminar flow only
2. Fully turbulent flow only
3. Leakage paths only
4. both Laminar and fully turbulent flow only
5. None of the Options
Correction Answer : Option No.(1)
Question Text:
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The size and speed of rotation being the same the head developed is maximum
Options:
1. an Axial flow fan
2. a backward bladed centrifugal fan
3. a radial bladed centrifugal fan
4. forward bladed centrifugal fan
5. None of the Options
Correction Answer : Option No.(4)
Question Text:
If the blade angle of the main fan is increased, the pressure developed by the fan
Options:
1. Increases
2. Decreases
3. May increase and decrease
4. Remains unchanged
5. None of the Options
Correction Answer : Option No.(1)
Question Text:
A hard working man consummes 2 X 10-3 m3/ min of oxygen, the required air Q in m 3/ min containing 21% of oxygen needed to be supplied to the working place per minute so as to keep the level of oxygen concentration of exhale air at 19% will be
Options:
1. 0.1
2. 0.125
3. 0.15
4. 0.2
5. None of the Options
Correction Answer : Option No.(1)
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Question Text:
If fire damp emission rate is 5m3/ min and it is proposed to be brought down to 0.5% by circulating air. The approximate air quantiy in will be
Options:
1. 12.5
2. 16.7
3. 18.2
4. 21.2
5. None of the Options
Correction Answer : Option No.(2)
Question Text:
Measures of risk is obtained from the likelyhood of occurrence (l) and consequence of these occurrence © by
Options:
FMC- Mine Ventilation, Fires, Explosion & Inundation
1. l + c
2. l – c
3. l x c
4. l / c
5. c / l
Correction Answer : Option No.(3)
Question Text:
With normal diet and rest in bed, the respiratory quotient is around
Options:
1. 0.01
2. 0.3
3. 0.5
4. 0.6
5. 0.85
Correction Answer : Option No.(5)
Question Text:
Specific cooling power of mine air depends on
Options:
1. Dry bulb temperature, wet bulb temperature, velocity of air
2. Dry bulb temperature, wet bulb temperature, velocity of air, radiant temperature
3. Dry bulb temperature, wet bulb temperature, velocity of air, radiant temperature, atmospheric pressure
4. Dry bulb temperature, wet bulb temperature, velocity of air, atmospheric pressure, skin temperature
5. None of the Options
Correction Answer : Option No.(4)
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Question Text:
1 Kg of methane on complete combustion produces _____ kJ of heat
Options:
1. 55.7
2. 556.8
3. 5568
4. 55685
5. None of the Options
Correction Answer : Option No.(4)
Question Text:
CO make of more than ________lit/min. indicates that the heating is well developed & urgent action must be taken
Options:
1. 10
2. 20
3. 30
4. 40
(5) 50
Correction Answer : Option No.(2)
Question Text:
The input motor power consumption in a mine can be reduced by
Options:
1. reducing the mine resistance
2. selecting the fan which has maximum efficiency at the operating point
3. Selecting motor having maximum efficiency & maximum tranmission efficiency in case of V-Belt drive
4. All the Options
5. by increasing the size of airways
Correction Answer : Option No.(4)
Question Text:
Which coal is more prone to spontaneous combustion
Options:
1. High thermal conductivity
2. Low porosity
3. Self heating rate from 40°C to 70°C is 1.5°C/hr i.e. R70 = 1.5°C/hr.
4. High thermal conductivity and Self heating rate from 40°C to 70°C is 1.5°C/hr i.e. R70 = 1.5°C/hr.
5. None of the Options
Correction Answer : Option No.(3)
Question Text:
When Tâ‚ is absolute temperature at which evaporation of vapour takes place,T2 is absolute temperature at which condensation of vapour takes place, then co-efficient of performance can be expressed as
Options:
1. Tâ‚/(T2-Tâ‚)
2. Tâ‚/T2
3. (T2-Tâ‚)/Tâ‚
4. Tâ‚/(Tâ‚-T2)
5. None of the Options
Correction Answer : Option No.(1)
Question Text:
What is required to be done, to get high head from axial flow fan, keeping its size and speed within reasonable limit ?
Options:
1. Increase in power input
2. Changing the shape
3. Installing another fan in series
4. Increasing no of stages
5. None of the Options
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Correction Answer : Option No.(4)
Question Text:
Eddy loss for fan is significant when____________
Options:
1. fan runs at its full capacity
2. fan operates at low volume
3. fan drift cross-section is very high
4. fan drift cross-section is very low
5. fan operates at high volume
Correction Answer : Option No.(2)
Question Text:
Large ventilation fan with high starting torque preferable motor will be
Options:
1. Squirrel cage Induction Motor
2. Capacitor start Motor
3. DC shunt Motor
4. Slip ring Induction Motor
5. None of the Options
Correction Answer : Option No.(4)
Question Text:
Which statement is correct?
Options:
1. Flammability of coal dust increases in proportion with increase in percentage of fire damp
2. Flammability of coal dust decreases in proportion with increase in percentage of fire damp
3. Flammability of coal dust does not depend on presence of fire damp
4. Flammability of the coal dust initially increases and then decreases
5. None of the Options
Correction Answer : Option No.(1)
Question Text:
The purpose of evassee in a fan is not
Options:
1. To reduce the final velocity of the discharged air by providing a passage of increasing cross section through which air must pass
2. To eliminate turbulence
3. To promote smooth flow of air and prevent re-entry of air from atmosphere
4. To reduce the air quantity
5. To increase fan efficiency
Correction Answer : Option No.(4)
Question Text:
The permission to extract pillars below an area has been obtained. The HFL of the area changes and HFL passes over this area. Under the circumstances what needs to be done.
Options:
1. Extraction can be continued as permitted earleir.
2. Fresh permission from DGMS will be required for extracting pillars.
3. Embankment may be constructed to keep the area unaffected from new HFL
4. Embankment may be constructed to keep the area unaffected from new HFL and fresh permission from DGMS will also be required for extracting pillars.
5. None of the Options
Correction Answer : Option No.(4)
Question Text:
The unit kgf.s².m¯â¸ is also known as
Options:
1. gaul
2. Murg
3. Killomurg
4. Atkinson
5. None of the Options
Correction Answer : Option No.(3)
Question Text:
Mass of water vapour present in a unit mass of air is known as
Options:
1. absolute humidity
2. relative humidity
3. specific humidity
4. mixing ratio
5. None of the Options
Correction Answer : Option No.(3)
Question Text:
Choose the wrong statement
Options:
1. Trickett"s ratio for assessing status of fire in a sealed area will not work, if intake air is oxygen deficient through the injection of nitrogen and carbon dioxide or through a high methane make)
2. Fresh air dilution of the fire products has no effect on Trickett"s ratio.
3. If Trickett"s ratio is less than 0.4, there is no fire and gases are residual than active
4. If Trickett" ratio is > 1.6, there is serious fire
5. None of the Options
Correction Answer : Option No.(4)
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Question Text:
When regulator is installed to regulate air quantity in a district, the pressure developed in the main fan
Options:
1. decreases
2. increases
3. remain same
4. may increase or decrease depending on the fan type
(5) None of the Options
Correction Answer : Option No.(2)
Question Text:
Which is correct statement ?
Options:
1. Foam extinguisher when directed against a fire, the foam spreads over the entire fire area covering or blanketing it, thus cutting oxygen supply.
2. Wet foam layer produces a cooling effect to extinguish the fire.
3. Foam extinguisher when directed against a fire, the foam spreads over the entire fire area covering or blanketing it, thus cutting oxygen supply; and Wet foam layer produces a cooling effect to extinguish the fire.
4. Foam extinguisher is generally recommended for fighting electrical fire.
5. All the Options
Correction Answer : Option No.(3)
Question Text:
The auxiliary fan should not suck more than ______% of available air to avoid recirculation.
Options:
1. 30
2. 40
3. 50
4. 60
5. 70
Correction Answer : Option No.(3)
Question Text:
Which is wrong statement ?
Options:
1. Reversing of air current is easier in axial flow fan compared to centrifugal fan.
2. Less space is required in case of axial flow fan compared to centrifugal fan
3. Axial flow fan is used when low air quantity at high pressure is required.
4. Cost of axial flow fan is less compared to centrifugan fan
5. None of the Options
Correction Answer : Option No.(3)
Question Text:
Which of the following is not the advatage of fighting fire with inert gases
Options:
1. It offers maximum possible safety against risk of explosion & spread of fire, if applied at correct time
2. Recovery work negligible & hence rapid
3. Inert gas penetrates easily into cracks & cavities than clay or sand
4. Fire brigade can operate for longer periods
5. None of the Options
Correction Answer : Option No.(5)
Question Text:
Match the following thickness of
A. Brick isolation stopping 1. 1.5m
B. Walls of air crossing 2. 0.5m
C. Minimum thickness of concrete dam 3. 0.25m
D. RCC isolation stopping 4. 1.0 m
Options:
1. A-2, B-3, C-4, D-1
2. A-3, B-4, C-2, D-1
3. A-1, B-2, C-3, D-4
4. A-2, B-4, C-2, D-1
5. A-4, B-3, C-1, D-2
Correction Answer : One option in the question text was incorrect, so mark was awarded to all the candidates
Question Text:
The direction of natural ventilation is mainly dependent on
Options:
1. Length of the mine
2. Depth of the mine
3. Quantity of CHâ‚„ emission in mine
4. Amount of explosives used in the mine
5. Number of persons deployed in the mine
Correction Answer : Option No.(2)
Question Text:
An auxiliary fan ventilating a heading through a duct of 600 mm diameter, circulates 5 m3 / sec of air at the face. What will be the velocity of air in the duct ?
Options:
1. 17.67 m/s
2. 16.76 m/s
3. 17.00 m/s
4. 16.67 m/s
5. None of the Options
Correction Answer : Option No.(1)
Question Text:
Which of the following is a type of Centrifugal Fan?
Options:
1. Radial bladed
2. Invert bladed
3. Upper bladed
4. lower bladed
5. twisted blade
Correction Answer : Option No.(1)
Question Text:
Pressure required to circulate 3000 m3 / min of air through 2000 m long gallery of 2m X 5 m cross section.
Value of K= 0.001 Ns2m-4
Options:
1. 70 Pa
2. 700 Pa
3. 14 Pa
4. 7 Pa
5. 35 Pa
Correction Answer : Option No.(1)
Question Text:
In a gassy seam of degree II, the quantity of air shall be measured once at least in every
_________ days and examination of every airway, air crossing, ventillation stopping and door in use shall be done once at least in every ___________days
Options:
1. 14, 30
2. 7 , 14
3. 20, 30
4. 14, 14
5. 30, 45
Correction Answer : Option No.(4)
Question Text:
Where the embankment is provided against any water course, the height of embankment above HFL as per Coal Mines Regulation, 1957 should not be less than
Options:
1. 1.5 m
2. 2.0 m
3. 3 m
4. 6 m
5. None of the Options
Correction Answer : Option No.(1)
Question Text:
During rainy season to prevent inrush of surface water inside the mine, every protective work constructed for the purpose shall be inspected at least once in
Options:
1. daily
2. 7 days
3. 14 days
4. 20 days
5. 30 days
Correction Answer : Option No.(3)
Question Text:
Methane layering number is 15.
Options:
1. No action required
2. Immediate action needed
3. Further investigation required
4. No interpretation can be made
5. None of the Options
Correction Answer : Option No.(1)
Question Text:
A fan delivers 60 m3/sec at 100 mm of w.g. pressure when the rpm of fan is 700. The rpm changes to 900. The pressure developed by fan will be
Options:
1. 593.4 Pa
2. 1261.3 Pa
3. 1425.3 Pa
4. 1621.6 Pa
5. None of the Options
Correction Answer : Option No.(4)
Question Text:
The man during hardwork (mining operations with handheld tools) produces heat in the range of
Options:
1. 50 to 100 Kcal/hr
2. 100 to 150 Kcal/hr
3. 150 to 200 Kcal/hr
4. 200 to 250 Kcal/hr
5. 250 to 400 Kcal/hr
Correction Answer : Option No.(5)
Question Text:
Carbon monoxide detector tubes uses
Options:
1. PETN
2. Protosorb
3. Hopcolite
4. Potassium palladium sulphate
5. None of the Options
Correction Answer : Option No.(4)
Question Text:
A cap lamp must be able to produce an illumination of
Options:
1. 0.25 lumans
2. 0.25 lux
3. 0.25 candlas/m
4.
4. 0.25 foot candlas
5. None of the Options
Correction Answer : Option No.(1)
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Question Text:
The operating point of a PV-200 fan is as follows. Quantity =1800m3/min, pressure=10 mm w.g. The mine resistence in kilo murg is equal to
Options:
6. 0.011
7. 0.11
3. 0.278
4. 1.1
5. None of the Options
Correction Answer : Option No.(1)
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Question Text:
When Q is in m3 / sec and P in Pa and R is in Gaul, Equivalent orifice in m2 can be defined as
Options:
6. 1.29Q/√P
7. 1.29/√R
8. 1.29√P/Q
9. 2.29√P/Q
10. 2.29Q/√P
Correction Answer : Option No.(2)
Question Text:
Which of the following is true?
Options:
11. Q2=R/P
2. Q=√R/P
3. Q=√R/√P
4. Q=√P/√R
5. Q=R/P
Correction Answer : Option No.(4)
Question Text:
If air quantity circulated by the fan is 6000 m3 /min and pressure developed by the fan is 100 Pa, air power is equal to
Options:
6. 10 kW
7. 100 kW
3. 600 kW
4. 700 kW
5. None of the Options
Correction Answer : Option No.(1)
Question Text:
In a sealed off area, the analysis report shows the following gas percentage O2-19.2, CO-0.8, CO2-2, and N2-78 , the Graham's ratio is
Options:
6. 0.04
2. 0.54
3. 0.78
4. 1.36
5. None of the Options
Correction Answer : Option No.(2)
Question Text:
Which statement is most correct?
Options:
6. Coal dust explosion are more severe than methane explosion
2. With methan explosion, CO is occasionally found while in coal dust explosion CO is always found
3. With methane explosion H2S gas is always found
4. Coal dust explosion are more severe and always associated with presence of CO; where as methane explosion comparatively weaker with lesser CO generation
5. None of the Options
Correction Answer : Option No.(4)
Question Text:
Fire extinguishing index is
Options:
6. intensity of inert gas injection rate to reduce oxygen from a level of 21% to 2% in a sealed off area
2. the ratio of total injection of inert gas in m3 to the time in hours it requires to fill the sealed off volume
3. a measure for the fraction of the sealed volume which is filled with inert gases per month
4. a measure for the fraction of the sealed volume which is filled with inert gases per day
5. None of the Options
Correction Answer : Option No.(2)
Question Text:
Minimum velocity required at 4.5m from any discontinued face in degree III mine?
Options:
6. 15 m/ min
7. 30 m/min
8. 45m/min
9. 60m/min
10. None of the Options
Correction Answer : Option No.(3)
Question Text:
When nitrous fumes passes over a filter paper soaked with starch and potassium iodite, the filter paper becomes
Options:
5. red
2. yellow
3. black
4. green
5. blue
Correction Answer : Option No.(5)
Question Text:
The mechanical efficiency of a fan is
Options:
7. the ratio of the power actually absorbed by the impeller and converted into head to the power applied to the shaft
2. the ratio of the air power to the input power
3. the ratio of the input head to Euler's head
4. the ratio of total head developed to the velocity head
5. None of the Options
Correction Answer : Option No.(1)
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