Mining Machinery - Mining Methods and Machinery - Mining Engineering Previous Year Questions

Which one of the following supports does NOT require a power pack for its operation

A 3.3 kV, 3-phase AC motor having a PF of 0.85 draws current at 95 A. The motor input power in kW is

A 15 yd3 dragline is deployed in an overburden bench of an opencast mine. It works for 40 days at the rate of 6 hours per shift and 3 shifts a day. The cycle time, bucket fill factor, and operating efficiency of the dragline are respectively 50 s, 0.8, and 75%. The total volume of overburden in m3 handled by the dragline is (1 yd3 = 0.765 m3)

In an opencast mine, a centrifugal pump is required to lift water at the rate of 60 L/s to a height of 80 m above the pump level. The vertical suction head is 4 m. The total friction head including shock and energy loss is 10 m. If the pump runs at an efficiency of 80%, the brake power of the motor in kW is

The shear force diagram for the shaft shown below resembles which one of the following graphs?

A 12 tonne diesel locomotive of 60 kW is plying in an underground haulage roadway. The coefficient of adhesion is 0.25 and the maximum gear efficiency is 80%. The speed in m/s at which it will haul a train at its full power is

For a track gauge of 1.05 m and a speed of 10 km/hour, the super-elevation in cm from the following figure is

The power requirement of the motor of the chain conveyor in kW, if it moves in the uphill direction at a gradient of 1 in 10, is

The standard time required for the same drilling job by the crew in min is

Match the following:

A drum winder of radius 2.5 m draws a power of 308 kW when the maximum rope speed is 7 m/s. The RMS torque in kNm is