Space factor of locked coil rope is . . . . . . . .
A. 30 - 40%
B. 40 - 50%
C. 50 - 60%
D. 75%
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The Alluminium body of the coal drill weights . . . . . . . .
A. 17.5 kgf
B. 23 kgf
C. 21.5 kgf
D. 24 kgf
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Expected out put from a continuous miner in underground.
A. 1500 tpd
B. 1000 tpd
C. 500 tpd
D. 100 tpd
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The rope speed is generally . . . . . . . . km/h in direct rope haulage.
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Drill rod fits in drill chuck by . . . . . . . . joint the bit attached to the rod by . . . . . . . .
A. Bonnet, ring
B. Lap, spring
C. Butt, wrapping
D. Bayonet, wire nail
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For hoisting in deep mines, the type of drum employed as it reduces the net starting torque.
A. Cylindro conical
B. By-cylindro conical
C. Cylindrical
D. None
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If U and V are the velocities of water at two points in a pipe line, the difference in pressure energy to water is P =
A. 2 g V 2 + 2 g U 2
B. 2 g V 2 − 2 g U 2
C. g V 2 − g U 2
D. 3 g V 2 − U 2
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The head volume curve is considered to be true characteristic of the pump as it depends only on the . . . . . . . .
A. Impeller design
B. Volute
C. Casing
D. Speed
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The type of motor employed in endless haulage . . . . . . . .
A. Slip ring
B. Squirrel cage
C. Shut
D. None
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Triangular distribution plate is made of . . . . . . . .
A. Alluminium
B. Nicel steel
C. Mild steel
D. Galvonised iron
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When the water leaves from volute casing of pump it posses high . . . . . . . . energy but only a little . . . . . . . .
A. Thermal energy, Heat energy
B. Pressure energy, Kinetic energy
C. Electric energy, Velocity energy
D. None
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A steel or concrete frame work on the mouth of shaft called
A. Winding
B. Skip
C. Head gear sheave
D. Head gear
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The co-efficient of running friction in a michell thrust being is about . . . . . . . .
A. 0.01
B. 0.002
C. 0.004
D. 0.006
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Which plates of the oremerod safety hooks . . . . . . . . actually transmit the load of the cage to the rope.
A. Inner plate
B. Middle plate
C. Outer plates
D. All of these
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Ropes used for guide ropes . . . . . . . .
A. Full locked coil
B. Half locked coil
C. Non Rotating
D. None
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When a body is immersed, either partially or wholly, in a liquid, the liquid presses vertically upwards with a force equal to weight of the liquid displaced called
A. Bournalis principle
B. Hydraulics principle
C. Archimedes principle
D. None
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Keps are not required at . . . . . . . .
A. Pit bottom
B. Shaft mid set
C. Pit top
D. All of these
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The type of electric motor employed in direct rope haulage.
A. Squirrel cage
B. Slip ring
C. Induction
D. All of these
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AM 50 driven by . . . . . . . .
A. Compressed air motor
B. Steam IC engine motor
C. Hydrualic motor
D. Electric motors
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Which haulage system need more number of tubs and rope clips required . . . . . . . .
A. Direct
B. Main and tail
C. Gravity
D. Endless
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