Question:
The combined sound pressure level measured at a point in a production bench due to one dumper and one shovel is 95 dB(A). If the sound pressure level of shovel alone is 90 dB(A), the sound pressure level of the dumper alone, in dB(A), at the same point is_____.(round off up to 2 decimals)
The combined sound pressure level measured at a point in a production bench due to one dumper and one shovel is 95 dB(A). If the sound pressure level of shovel alone is 90 dB(A), the sound pressure level of the dumper alone, in dB(A), at the same point is_____.(round off up to 2 decimals)
Updated On: Jul 18, 2024
Hide Solution
Verified By Collegedunia
Correct Answer: 93
Solution and Explanation
The correct answer is: 93.00 or 94.00 (approx)
Was this answer helpful?
0
0
Top Questions on Sampling: Methods, Practices and Interpretation
- The data obtained from an air sample analysis of an old working in a coal mine are given.
O2 17.15%, CO2 3.40%, CH4 2.20%, and N2 77.25%.
Considering atmospheric air contains
O2 20.95%, CO2 0.03%, and N2 79.02%,
the percentage of blackdamp in the old working, is____.( round off up to 2 decimals)- GATE MN - 2024
- Mine Planning
- Sampling: Methods, Practices and Interpretation
- Match the following features with the corresponding symbols
Feature in mine plan Symbol P shaft 1 
Q staple shaft 2 
R Abandoned shaft 3 
S Abandoned staple shaft 4 
- GATE MN - 2024
- Mine Planning
- Sampling: Methods, Practices and Interpretation
Questions Asked in GATE MN exam
- A Bord and Pillar panel is developed at a depth of 250 m in a flat coal seam. The vertical stress gradient is 0.027 MPa/m. If the strength of a square pillar is 12.5 MPa, the extraction ratio of the pillar for a safety factor of 1.5, is____.(round off up to 2 decimals)
- GATE MN - 2024
- Room and pillar mining
- Water is pumped from a mine sump at the rate of 300 m3/hr to an inverted conical water tank, as shown. The rate of rise in water level in m/min, at the instant water level reaches at 5 m height from bottom of the tank, is____.(round off up to 2 decimals)
- GATE MN - 2024
- Levels and Levelling
- A mine worker weighing (W) 600 N lifts an object of 100 N as shown. The 50% body weight is applied downward through point A and a force FE is produced parallel to x axis by the contraction of erector spinae muscle during lifting. The lumber disc, L (shown by red box) acts as a smooth hinge and keeps the upper body in static equilibrium. Ignore all other forces in the body. The magnitude of the resultant of the reaction forces, in N at the lumber disc, is____.(round off up to 2 decimals)
- GATE MN - 2024
- Mechanization of Surface Mining
- In an opencast coal mine, blast vibrations are measured at two locations, A and B simultaneously for a maximum charge per delay (Q) of 1200 kg as given.\(PPV=K[\frac{D}{\sqrt{Q}}]^{-B}\)
Location Distance from the blast face, D (m) PPV (mm/s) A 100 112.5 B 300 20.3
where, K and ẞ are site constants. The PPV in mm/s, at a distance of 200 m from the blast face, is (round off up to 2 decimals)- GATE MN - 2024
- Ground Vibrations
- A solid ball of mass 10 kg is subjected to forces as shown. The magnitude of the acceleration in m/s2, is____.(round off up to 2 decimals)
- GATE MN - 2024
- Optimization of Facility Location
View More Questions