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Category: General

1. A coal heading 4m wide and 2.5m high has an advance of 1m per blast round. The amount of explosive used in blasting is 6 kg. taking specific gravity of coal as 1.5, the powder factor (tonne/kg) is

2. What is the sound power level of a sound source radiating energy at a rate of 0.2 W?

3. At a surface mine office, the independent Sound Pressure Level (SPL) measured in dB(A) on account of 3 drill machines are 85, 88 and 85. If all the three machines work simultaneously, the combined SPL, in dB(A) is

4. In the Moh’s scale of hardness, the minerals in increasing sequence of hardness are

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