Questionare on CMR & CMA
Questionare on CMR & CMA
Q1. Which cut is used for solid blasting in
Indian coal Mines
a) Fan cut b) burn cut c) wedge cut d) drag cut
Q2. Permitted explosives are safe to use
because
a) They have less strength
b) they have low velocity of
detonation
c) they do not produce much
noise during blasting
d) special chemical are used
to extinguish the spark produced during blasting.
Q3. Burden is the distance between
a) Two blast holes in same row
b) distance between two rows
c) distance between first row of blast holes and
bench
d) d) none of the above
Q4. Which of the following explosive have
maximum strength
a) ANFO b) TNT c) RDX d) Nitroglycerine
Q5. To measure the performance of blasting
which factor is calculated
a) Tonnage factor b) space factor c) stripping
ratio d) Powder factor
Q6. What
is the formula for blast ability?
a) B = c / t b)B=t / c c) B = c + t d) B=
c X 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 —
a) 100 m b) 150 m c) 200m d)
300m
Q8 While blasting in hot strata the temperature
of hole should not exceed
a)50oc b)60oc c) 70o c d) 80oc
Q9 Fly rocks during opencast blasting is
controlled by
a) Pop shooting b) Plaster
shooting c) muffled blasting d) overcharging
Q10 While dealing with Misfire shot the
relieving hole is drilled at a distance not less than
a) 10 m b) 20m c)
30 m d)40 m
Q11 As per CMR the recapping of rope is done
once at least in every
a)
3 month b) 4 months c) 6 months d) 1 year.
Q12 What is the maximum angle of fleet is
permissible in winding as per CMR
a) 1 b) 1.5 c) 2 d)2.5
Q13 A coal seam is said to be of degree III if rate
of emission of gas in m3/te of coal raised is
a) is equal to 10 b) less than 10 c) more than 10 d) in between 1 to 10
Q14 Reportable injury means any injury other than serious bodily injury, which involves the enforced absence of injured person from work for a period of
a) 24 hours or more b) 36 hours or more c) 48 hours or more d) 72 hours or more
Q15 When the air and mineral flow is in same direction
the ventilation is known as
a) Homotropal ventilation b) antitropal ventilation c) boundary ventilation
d) natural ventilation
Q16 Roof falls are more common if the face is at
a) Right angles to the main cleat
b) Parallel to the main cleat
c) 60 degrees to the main cleat
d) None of the above
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
a) 15.0 mtrs
b) 16.5 mtrs
c) 19.5 mtrs
d) 13.5 mtrs
Q18 In board and pillar panel worked in conjunction
with hydraulic slowing extraction line preferred is
a) Step diagonal
b) Diagonal
c) Steep diagonal
d) Straight
Q19 emulsion explosive is mixture of
a) Ammonium nitrate, TNT, NG
b) Ammonium nitrate, TNT, guar gum
c) Ammonium nitrate, NG , water
d) Ammonium nitrate, water, hollow microballons
Q20 Coalfication has taken place in order of
a) Peat. Lignite, bituminous, anthracite
b) Lignite, peat, bituminous, anthracite
c) Peat, lignite, anthracite, bituminous
d) Bituminous, peat, anthracite, lignite
Q21 coal seams are normally found in
a) Sedimentary rocks
b) Igneous rocks
c) Metamorphic rocks
d) Any type of rocks
Q22 In India a coal seam is defined as a thick coal
seam if its thickness is
a) 3m or more
b) 3.5 m or more
c) More than 4.8 m
d) 2.5m or more
Q23 black damp is a mixture of
a) CO2+N2
b) CH4+CO
c) CO+ CO2
d) O2 + H2S
Q24 When working approaches waterlogged areas apparatus
used as precautionary measure is
a) Diamond drilling
b) Bum side boring
c) Jackhammer drilling
d) Chilled shot drilling
Q25 Keps
are used in
a) Koepe winding
b) Direct haulage
c) Endless haulage
d) Drum winding
Q26 Chasnala mine disaster was due to
a) Fire
b) Inundation
c) Explosion
d) Noxious gases
Q27 permissible dust concentration in Indian mines
is
a) 3mg/m2 of air
b)
4mg/m2 of air
c)
3.5mg/m3 of air
d)
5mg/m2 of air
Q28 Factor of safety for winding rope is
a) 10 b) 15
c) 5 d) 7.5
Q29 Life of winding rope is
a) 4.5 years
b) 14 months
c) 2 years
d) 3.5years
Q30 Runaway switch is used in
a) Rope haulage
b) Winding
c) Belt conveyor
d) Aerial ropeway
Q31 The purpose of wire gauge in flame safety lamp
is
a) To prevent the passage of flame from inside lo the
outside of the lamp
b) To prevent the passage of CH4 from outside to the
inside of the lamp
c) To disperse the combustion gases uniformly
d) For proper circulation of air current
Q32 The hopkalite used in CO detector is a mixture
of MnO2 and
a) Lead oxide
b) Copper oxide
c) NaCl
d) Silica gel
Q33 Sell-rescuer can be used upto_______% of CO
a) 2 b)
3 c) 1.5 d) 2.5
Q34 According to CMR 1957 CH4 % in return airway should not exceed
a) 1% b) 1.75% c) 0.75% d) 1.25%
Q35 the wet bulb temperature in development faces should not exceed
a) 33oC b) 32.5oC c) 33.5oC d) 30oC
Q36 In contiguous seams means the parting
between two seams is within
a) 10m b) 9m
c) 15m d) 20m
Q37 which of the following instruments is used
to measure the cooling power of the air
a)Anemometer
b)Velometer
c) Manometer
d) Katathermometer
Q38 Joining of two ropes is called as
a) Splicing b) Capping c) Interlocking d) Gassing
Q39 Clifton pulley is used in
a) Direct rope haulage
b) Main and tail rope haulage
c) Gravity haulage
d) Endless rope haulage
Q40 when shot hole is blasted at a quarry face,
fracture of rock takes place by
a) Compression shock wave
b) Reflected shock wave
c)
Both by compression and tensile
d) By gas pressure
Q41 The minimum accuracy of colliery
triangulation survey is aimed at
a) 1 in 5000
b) 1 in 7000
c) 1 in 10000
d) 1 in 15000
Q42 Fast and accurate extension of center lines
in long tunnels can be done by
a) Miners dial
b) Theodolite
c) Laser beam ranger
d) Strings with chalk marks
Q43 Mechanized opencast mining in India is
economically feasible at present if the overburden to coal ratio is
approximately up to
a) 1 in 2
b) 1 in 4 c) 1 in 8 d) 1 in 10
Q44 for overburden removal with shovel dumper
combination the optimum size of the dumper depends on
a) The distance of the haul
b) Size of the shovel
c) Size of the shovel and the distance of haul
d)
Tonnage to be handled
Q45 In an underground coal mine the place where
explosive is stored in underground is called as
a)
Reserve station
b)
Shelter
c)
Magazine
d)
None of the above
Q46 For heavy duty crushing on hard material the
type of jaw crusher normally selected is
a)
Blake
type double toggle
b)
Dodge
type
c)
Single
toggle type
d)
None
of the above
Q47 To separate two finely divided solids from
one another the process to be selected is
a) Floating
b) Washing
c) Jigging
d) None of the above
Q48 A Zn deposit is
formed by a geological process is called
a)
Hydrothermal
b)
magmatic
separation
c)
supergene
d)
None
of the above
Q49 Cut and fill sloping can be operated
a) Underhand only
b) Overhand only
c) Both underhand and overhand
d) None of the above
Q50 If the RQD of the
ore and wall rock are low, the method of sloping selected will be
a)
Shrinkage
b)
Sublevel
caving
c)
Block
caving
d)
Cut
and fill
Answers :
1.c
|
2.d
|
3.c
|
4.c
|
5.d
|
6.a
|
7.d
|
8.d
|
9.c
|
10.a
|
11.c
|
12.b
|
13.c
|
14.d
|
15.a
|
16.b
|
17.b
|
18.a
|
19.d
|
20.a
|
21.a
|
22.c
|
23.a
|
24.b
|
25.d
|
26.c
|
27.d
|
28.a
|
29.a
|
30.a
|
31.a
|
32.c
|
33.b
|
34.c
|
35.a
|
36.b
|
37.d
|
38.a
|
39.d
|
40.c
|
41.a
|
42.c
|
43.c
|
44.c
|
45.a
|
46.a
|
47.a
|
48.a
|
49.c
|
50.c
|
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