Mining Engineering
GATE MN topic:mining-machinery PYQs
Build your understanding with focused practice from past exam papers.
Questions 51–56 of 56. Imported answers require independent review unless marked reviewed.
Question 42
Open questionMNNAT2 marksNeeds review
In a direct rope haulage operating along a 1500 m long incline, 180 tonne of coal is hauled in 7 hours. The average rope speed is 7.5 km/h. The set changing time for the tubs is 2 minutes each at the top and bottom of the incline. If the tub capacity is 1.0 tonne, the number of tubs in the set is ____________________.
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Open questionMNNAT2 marksNeeds review
An SDL of 1.0 tonne capacity operates with a cycle time of 6 minutes. The dimension of the face is 4 m x 3 m. Five blasts are conducted per shift with an average pull of 1.2 m. If the density of blasted coal is 0.8 tonne/m
, the time required by the SDL in the shift to lift all the prepared coal in hours is ____________________.Log in to check the answer
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Open questionMNNAT1 markNeeds review
A double ended ranging drum shearer is employed in a longwall mine of face length 150 m. The mining height is 3.5 m and depth of the web cut is 0.76 m. The cycle time for unidirectional cutting is 40 min. Considering bulk density of the coal to be 1.4 t/m
, hourly production from the face in tonne is ________Log in to check the answer
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Open questionMNMCQ1 markNeeds review
The strength of a stranded wire rope is proportional to
Your answerChoose one option.
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Open questionMNNAT2 marksNeeds review
The discharge rate of a water pump is 0.25 m³/s. The diameter of the discharge and suction nozzles are 300 and 350 mm respectively. The measured pressure at the discharge end located 0.25 m above the center line of the impeller is 150 kN/m² and the pressure at the suction gage located at the centre line of the impeller is 20 kN/m². Specific weight of water is 9810 N/m³. The total dynamic head for the above installation in m is ________
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 52
Open questionMNNAT2 marksNeeds review
A 1.1 m wide belt conveyor carries materials of bulk density 1.35 t/m³ at a speed of 1.75 m/s. The average cross-sectional area of material is equal to
, where w is the width of the belt in m. The carrying capacity of the conveyor in t/h is ________Log in to check the answer
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