Mining Machinery — Part 1 MCQs with Explanations

Independent wire rope is the correct answer to “Coal cutting machine ropes are . . . . . . . . wire rope core.”. This question is standard in competitive examination syllabi for Mining Machinery.

5.60 is the correct answer to “Steel wire rope of 25mm diameter weighing 37N/m has 6 strands of 7 wires each. The diameter and tensile strength of each wire are 2.5mm and 1800 MPa, respectively. The factor of safety for raising a cage of weight 60 kN from a depth of 200m is”. This question is standard in competitive examination syllabi for Mining Machinery.

Rope splicing is the correct answer to “The joining of ropes is termed as . . . . . . . .”. This question is standard in competitive examination syllabi for Mining Machinery.

2 is the correct answer to “How many types of lay of ropes”. This question is standard in competitive examination syllabi for Mining Machinery.

P-IV, Q-III. R-II, S-I is the correct answer to “The following characteristic curves (P, Q, R, S) pertain to rotary drilling in rock. Title of the curve I : Torque versus RPM II: Rate of penetration versus uniaxial compressive strength of rock III : Rate of penetration versus weight on bit IV : Specific energy versus weight on bit Match the curves with their titles”. This question is standard in competitive examination syllabi for Mining Machinery.

Running rope is the correct answer to “The ropes which under go frequent movement of coiling they are called . . . . . . . .”. This question is standard in competitive examination syllabi for Mining Machinery.

Capacity factor is the correct answer to “The ratio between breaking load and total suspended load on rope called . . . . . . . .”. This question is standard in competitive examination syllabi for Mining Machinery.

Seven wire strand is the correct answer to “The haulage wire ropes are generally . . . . . . . .”. This question is standard in competitive examination syllabi for Mining Machinery.

Suction is the correct answer to “Rotation of impeller inside the pump forces water to enter in the suction pipe. This is effected due to”. This question is standard in competitive examination syllabi for Mining Machinery.

DERDS is the correct answer to “Cowl is the component of”. This question is standard in competitive examination syllabi for Mining Machinery.

Wire ropes is the correct answer to “Ropes of stainless steel not used in . . . . . . . .”. This question is standard in competitive examination syllabi for Mining Machinery.

18.74, 16.73 is the correct answer to “Figure shows a two pulley system for hoisting a load of 10 kN. The coefficient of friction between each pulley and the rope is 0.2. The vertical and horizontal distances between the centers of the pulleys are 25m and 16m respectively. The tensions T 1 and T 2 respectively in kN are”. This question is standard in competitive examination syllabi for Mining Machinery.

0.12 is the correct answer to “If the track gauge of underground haulage is 0.6m, radius of curve 2m, Velocity of train 2m/sec, then find out the amount of super elevation.”. This question is standard in competitive examination syllabi for Mining Machinery.

365 is the correct answer to “White metal temperature not exceeding °C during pouring.”. This question is standard in competitive examination syllabi for Mining Machinery.

1.36 m/s is the correct answer to “A conveyor is 600m long carrying coal having bulk density 0.8 t/m 3 up a gradient of 1 in 60 at the rate of 220 t/hr. If the belt width (w) is 0.75m and cross-sectional area of the material is 0.1w 2 , determine belt speed”. This question is standard in competitive examination syllabi for Mining Machinery.

34 is the correct answer to “A cage weighing 12000 kg is raised by four chains each making an angle of 30° with the vertical. The tension in each chain in kN is”. This question is standard in competitive examination syllabi for Mining Machinery.

Winding rope and lining of sheave is the correct answer to “In koepe winders, the power is transmitted through the friction between”. This question is standard in competitive examination syllabi for Mining Machinery.

To reduce the size is the correct answer to “The object of normalising is to remove . . . . . . . .”. This question is standard in competitive examination syllabi for Mining Machinery.

Galvanized rope is the correct answer to “Corrosion of the rope can be delayed by using . . . . . . . .”. This question is standard in competitive examination syllabi for Mining Machinery.

Co-efficient of resistance is the correct answer to “It is the ratio between resistance to the motion of a car along a straight level track with constant speed to the total weight of car”. This question is standard in competitive examination syllabi for Mining Machinery.

safety stopping device is the correct answer to “Function of pull cord in the belt conveyor system is”. This question is standard in competitive examination syllabi for Mining Machinery.

Drum winders is the correct answer to “Detaching hooks are used only with”. This question is standard in competitive examination syllabi for Mining Machinery.

To avoid over speeding is the correct answer to “What is the main purpose of jazz rail on underground haulage track”. This question is standard in competitive examination syllabi for Mining Machinery.

Ordinary lay is the correct answer to “If the wires in the strand and the strands in the rope are laid in opposite direction called . . . . . . . .”. This question is standard in competitive examination syllabi for Mining Machinery.

1.630 is the correct answer to “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”. This question is standard in competitive examination syllabi for Mining Machinery.

0.033 is the correct answer to “According to IS specifications 1835 of 1961 neither sulphur nor phosporous content in steel for wire rope should exceed . . . . . . . . percent.”. This question is standard in competitive examination syllabi for Mining Machinery.

10 - 15m is the correct answer to “The length of splice is nearly . . . . . . . . for 25mm diameter rope.”. This question is standard in competitive examination syllabi for Mining Machinery.

Tail rope haulage is the correct answer to “Which of the following haulages is one that is situated at a lower level and empties are hoisted up the sloping track”. This question is standard in competitive examination syllabi for Mining Machinery.

Langs lay is the correct answer to “The rope used for monocable aerial rope way.”. This question is standard in competitive examination syllabi for Mining Machinery.

0.6m is the correct answer to “What is the track gauge for tubs of 1.1m 3”. This question is standard in competitive examination syllabi for Mining Machinery.

Distance between pump motor and delivery point is the correct answer to “Which of the following factor has little or no effect on the development of head”. This question is standard in competitive examination syllabi for Mining Machinery.

Endless rope haulage is the correct answer to “Clifton pulley is used in”. This question is standard in competitive examination syllabi for Mining Machinery.

0.226 is the correct answer to “A two tonne mine car is released from the top of an incline at a height of 3m as shown in the figure. The mine car travels 45m along the inclined track and another 85m along the horizontal track before coming to rest. The specific rolling resistance of the, car in N/tonne is”. This question is standard in competitive examination syllabi for Mining Machinery.

2.33 is the correct answer to “A wire rope, round stranded with fibre core, has a diameter of 2.54 cm. What is the mass of the rope per m length if the value of the constant k is 0.36”. This question is standard in competitive examination syllabi for Mining Machinery.

972 is the correct answer to “A belt conveyor conveys material of average cross-sectional area of 0.09 m 2 . of bulk density 1.5 tonnes/m 3 , at a speed 2 m/s. The carrying capacity of the belt in tonne/hr is”. This question is standard in competitive examination syllabi for Mining Machinery.

Flexible coupling is the correct answer to “Which of the following device absorbs shock of the vibrations resulting form misalignment”. This question is standard in competitive examination syllabi for Mining Machinery.

Cylindrical drum without tail rope is the correct answer to “The above figure shows the duty cycle of hoist system. The system is”. This question is standard in competitive examination syllabi for Mining Machinery.

Lack of priming is the correct answer to “Water will not be delivered by a centrifugal pump due to”. This question is standard in competitive examination syllabi for Mining Machinery.

Diesel loco is the correct answer to “Which of the following locomotive is not recommended to be used where the coal is liable to spontaneous heating”. This question is standard in competitive examination syllabi for Mining Machinery.

Haulage for waste disposal is the correct answer to “Tail rope haulage is mainly used as”. This question is standard in competitive examination syllabi for Mining Machinery.