Mn:mining Engineering Worksheet - 2013 Page 5
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152013
MINING ENGG. –MN
Q.9
Incubation period is NOT related to
(A) crossing point temperature of coal
(B) panel size
(C) seam thickness
(D) explosibility of coal dust
Q.10
The rotational speed and cutting velocity of a drill are 350 rpm and 71.50 m/min respectively. The
diameter of the rotary drill bit in mm is
(A) 65
(B) 67
(C) 68
(D) 70
Q.11
The pressure on a phreatic surface is
(A) less than atmospheric pressure
(B) greater than atmospheric pressure
(C) equal to atmospheric pressure
(D) independent of atmospheric pressure
Q.12
Events A and B are independent but NOT mutually exclusive. If the probabilities P(A) and P(B) are
0.5 and 0.4 respectively, then P( ∪ B) is
(A) 0.6
(B) 0.7
(C) 0.8
(D) 0.9
Q.13
Among the following options, the specific energy for rock-drilling is lowest in
(A) rotary diamond drilling
(B) rotary roller drilling
(C) percussive drilling
(D) jet piercing
Q.14
Identify the correct statement for a ‘normal distribution’.
(A) Mean is greater than mode but less than median
(B) Mean is less than mode but greater than median
(C) Mean is greater than mode and median
(D) Mean, median and mode are equal
Q.15
An emulsion explosive of specific gravity 1.25 is used for blasting in an iron ore formation having
P-wave velocity of 3000 m/s and specific gravity of 3.20. For an explosive impedance to rock
impedance ratio of 0.5, the desired velocity of detonation of the explosive in m/s is
(A) 3840
(B) 4000
(C) 4200
(D) 7680
Q.16
The number of ways in which the letters in the word MINING can be arranged is
(A) 90
(B) 180
(C) 360
(D) 720
Q.17
Under standard temperature and pressure conditions the theoretical maximum height in m to which
water can be lifted using an air-lift pump is
(A) 10.33
(B) 9.61
(C) 7.45
(D) 6.05
Q.18
In a belt conveyor system, function of the snub pulley is to
(A) clean the inner surface of the belt
(B) clean the outer surface of the belt
(C) increase the angle of contact of belt with drive drum
(D) decrease the belt tension
MN
5/15
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