DGMS EXAM Gas testing GT 29 Dec 2021 AN
DGMS GAS TESTING EXAM DEC 2021 EXAM PAPER
1) “Gas” means ______
a)
Vapor
b)
Smoke &
Vapor
c)
Smoke and fume
d)
Fume or vapor
e)
None of the
options
2) What percentage of
CO formed/O2 Observed ratio indicates existence of healing
a)
0.50%
b)
1%
c)
2%
d)
3%
e)
0.035
3) Which diagram
explains the limits of explosbility of CH4?
a)
Coward
b)
Le Chateller
c)
Grahams
d)
Palvalov
e)
None of the
above
4) The thickness of the
wires of the wire gauges is about
a)
1 mm
b)
0.1 mm
c)
2 mm
d)
0.4 mm
e)
None of the
above
5) Water spraying can
prevent
a)
Methane
explosion
b)
Coal dust
explosion
c)
Inflammable gas
explosion
d)
All of above
e)
None of the
above
6) Is H2S
poisonous?
a)
Only in confined
areas
b)
Not poisonous
c)
Yes, but only in
large amounts
d)
Yes, it is
extremely poisonous even in small amounts
e)
None of the
above
7) The normal flame of
safety lamp burns with elongated flame consisting of three zones. Which among
the following is the correct description about the inner zone of normal flame –
a)
It is blue in
color, fuel vapor is not burnt
b)
It is
white/yellow I color, fuel vapor is partially burnt
c)
It is non
luminous complete combustion takes place production CO2 and water
vapor
d)
It is
white/yellow in color, fuel vapor is not burnt
e)
It is of no
color, fuel vapor is partially burnt
8) For determining
relative humidity at a place, the whirling hygrometer is rotated at a speed of
____
a)
100 rpm
b)
200 rpm
c)
150 rpm
d)
75 rpm
e)
125 rpm
9) Every stone dust
barrier shall be of such a type as may be approved by the :
a)
Chief inspector
of mines
b)
Regional
inspector of mines
c)
Inspector of
mines
d)
Joint inspector
of mines
e)
All of these
10) Why the use of open
flame is prohibited in below ground workings of a coal mine?
a)
It may cause
spontaneous heating
b)
It may cause
fire
c)
It may cause
explosion
d)
It may cause
fire and explosion
It may cause spontaneous heating fire and explosion
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