1. ANSWER SHEET
Q1. Which cut is used for solid blasting in Indian coal Mines
c) Wedge cut
Q2. Permitted explosives are safe to use because
d) Special chemical are used to extinguish the spark produced during blasting.
Q3. Burden is the distance between
c) Distance between first row of blast holes and bench
Q4. Which of the following explosive have maximum strength
c) RDX
Q5. To measure the performance of blasting which factor is calculated
d) Powder factor
Q6. What is the formula for blast ability?
a) B = c / t
Where B = Blast ability c = compressive strength t = tensile strength of a
rock
Q7 As per provision of regulation 170 (1a)(b) of CMR 1957 danger zone is an area
falling a radius of --------
d) 300m
Q8 While blasting in hot strata the temperature of hole should not exceed
d) 80 c
Q9 Fly rocks during opencast blasting is controlled by
c) muffled blasting
Q10 While dealing with Misfire shot the relieving hole is drilled at a distance not less
than
a) 10 m
Q11 As per CMR the recapping of rope is done once at least in every
c) 6 months
Q12 what is the maximum angle of fleet is permissible in winding as per CMR
b) 1.5
Q13 a coal seam is said to be of degree III if rate of emission of gas in m3 /te of coal
raised is
c) more than 10
2. Q 14 reportable injury means any injury other than serious bodily injury, which involves
the enforced absence of injured person from work for a period of
d) 72 hours or more
Q15 When the air and mineral flow is in same direction the ventilation is known as
a) Homotropal ventilation
Q16 Roof falls are more common if the face is at
b) Parallel to the main cleat
Q17 A seam is worked at a depth of 70 mtrs . from surface and the width of the
galleries is 3.2 mtr the dimension of the pillar should not exceed
b)16.5 mtrs
Q18 in board and pillar panel worked in conjuction with hydraulic stowing extraction
line preferred is
a) step diagonal
Q19 emulsion explosive is mixtur
d) ammonium nitrate, water, hollow microballons
Q20 Coalfication has taken place in order of
a) peat . lignite, bituminous, anthracite
Q21 coal seams are normally found in
a) Sedimentary rocks
Q22 In India a coal seam is defined as a thick coal seam if its thickness is
c)More than 4.8m
Q23 black damp is a mixture of
a) CO2 + N2
3. Q24 When working approaches waterlogged areas apparatus used as precautionary
measure is
b) Burn side boring
Q25 keps are used in
d)Drum winding
Q26 Chasnala mine disaster is due to
c) Explosion
Q27 permissible dust concentration in Indian mines is
d) 5mg/m2 of air
Q28 Factor of safety for winding rope is
a) 10
Q29 Life of winding rope is
a) 4.5 years
Q30 Runaway switch is used in
a) Rope haulage
Q31 The purpose of wire gauge in flame safety lamp is
a) to prevent the passage of flame from inside to the outside of the lamp
Q32 the hopkalite used in CO detector is a mixture of MnO2 and
e) Silica gel
Q33 Self-rescuer can be used upto ________ % of CO
b) 3
Q34 According to CMR 1957 CH4 % in return airway should not exceed
c) 0.75%
4. Q35 the wet bulb temperature in development faces should not exceed
a) 33 C
Q36 In contiguous seams means the parting between two seams is within
b) 9m
Q37 which of the following instruments is used to measure the cooling power of the air
d) Katathermometer
Q38 Joining of two ropes is called as
a) Splicing
Q39 Clifton pulley is used in
d) Endless rope haulage
Q40 when shot hole is blasted at a quarry face, fracture of rock takes place by
c) Both by compression and tensile
Q41 The minimum accuracy of colliery triangulation survey is aimed at
a) 1 in 5000
Q42 fast and accurate extension of centerlines in long tunnels can be done by
c) Laser beam ranger
Q43 Mechanized opencast mining in India is economically feasible at present if the
overburden to coal ratio is approximately up to
c) 1in 8
Q44 for overburden removal with shovel dumper combination the optimum size of the
dumper depends on
c) Size of the shovel and the distance of haul
5. Q45 In an underground coal mine the place where explosive is stored in underground is
called as
a) Reserve station
Q46 for heavy duty crushing on hard material the type of jaw crusher normally selected is
a) Blake type double toggle
Q47 To separate two finely divided solids from one another the process to be selected is
a) Floating
Q48 A Zn deposit is formed by a geological process is called
a) Hydrothermal
Q49 cut and fill stoping can be operated
c) Both underhand and overhand
Q50 If the RQD of the ore and wall rock are low the method of stoping selected will be
c) Block caving
Q51 the stoping method in which maximum cost is incurred is
a) Square set stoping
Q52 In the panel caving system of block caving the contact between the ore and capping
is kept
b)Inclined
Q53 The ventilation plan of a mine should be on a reference scale o
c)2000:1
Q54 In any working below ground there should be provided at least two shafts or incline
which should be away from each other by a minimum distance
b)13.5 mtrs
Q55 Poisson ratio is a relationship between
d) Longitudinal strain and lateral strain
6. Q56 RQD is a quantitative index based on core recovery procedure, which is determined
by incorporation of only those pieces of core that is
b) Greater than or equal to 100mm
Q57 In a contoured Map if there are higher values in side the loop it indicates
a) Ridge
Q58 The intersection of a vertical line through the observer’s station with the upper
portion of the celestrial sphere is called
a) Nadir
Q59 the effect of curvature in leveling is an error, which is
a) Subtractive
Q60 The minimum accuracy of colliery triangulation survey is aimed at
a) 1in 5000
Q61 The earliest indication of the spontaneous heating of coal can be given by
a) Sweating of strata
Q62 In an underground coal mine ventilated by 100 HP fan (Air HP) it is required to
double the quantity ofair for the purpose of air HP required will be
c) 800 H.P.
Q63 Ore for metal lead is
a) Galena
Q64 DGMS comes under
b) Labour Ministry
7. Q65 lily controller is used for the protection in winder
a) Over wind
Q66 balance rope is used on Koepe friction winder
d) To balance cage winding rope and to reduce power consumption
Q67Factor of safety (FOS) in connection with winding
d)applicable to static loading
Q68 LHD is a
d) Loading, hauling and dumping machine
Q69 the shape of the casting in a centrifugal pump is
a) involute
Q70 Magnetic separation is
a) A dry method
Q71 Notice to regional inspector of mines about occurrence of serious accident is given
in form
a) IV A
Q72 Blasting Gallery method is not suitable for working seam thickness
a) Less than 7 m
Q73 The size and speed of rotation being the same the head developed is max in case of
d) A forward bladed centrifugal fan
Q74 In water gas explosion the two highly explosive gases that are involved are
a) H2 and CO
Q75 In an underground working area CH4 and CO2 are normally expected to be found
respectively
c) Near the roof and near the floor
Q76 The most important parameter of a dust that governs its physiological effect is
8. d) Size of dust
Q77 In a mine a big roof fall has taken place in the mine intake place in main intake
airway. The fan drift water gauge
b) Will register an increase
Q78 Stone dust barriers are installed in underground
a) to prevent the imitation of coal dust explosion
Q79 . 60 dB + 60dB
c) 63 dB
Q80 In ventilation network analysis, kirchhoff’s first law is used which states
b)the algebraic sum of quantitities flowing at a junction is zero
Q81 Atkinson’s equation P = RQ2 is applicable for
a) Laminar flow only
Q82 NVP in a mine is more in
b)Winter as the air going in is cold
Q83 Reynolds number varies
b) Directly with flow velocity
Q 84 Resistance of a mine airway does not depend upon
c) Quantity of air flowing in it
Q85 An electric cap lamp as used in mine has a fuse of capacity
d) 4 amp
Q86 A 10% increase in cross sectional area of a roadway will reduce the resistance
approximately by
a) 10%
Q87 The recommended instrument for the air borne respirable dust sampling in the
Indian mines is
d)NCB/MRE-113A
Q88 The oxygen concentration in underground mine should not be less than
9. c)19%
Q89 the thickness of ventilation stopping should not be less than
b)38 cms
Q90 A cap lamp must be able to produce an illumination of
a) 0.25 lumans
Q91 Gravimetric dust samplers works on the principals of
a) filtration
Q92 carbon monoxide detector tubes uses
d)Potassium palladium sulphate
Q93 Installation of booster fan in one district
a) Reduces the flow of air in other district
Q94 Pitot tube is generally used for
c) Measurement of air velocity in ducts
Q95 Gas chromatography utilizes the principal of
c)Solid gas absorption
Q96 Explosibility of coal dust generally does not depends on
d)Colour of dust
Q97 For measuring relative humidity we use
c)Psychrometer
Q98 Geothermal gradient in Indian coalfields is about
c)1 0 C / 38m
Q99 A drum Shearer is mounted on
a) Its own skid
Q100 Dust generation may be reduced by drilling b) Sharp bit
