GUJARAT TECHNOLOGICAL UNIVERSITY
SEMESTER-IV(NEW) — EXAMINATION — SUMMER 2019
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Subject Code: 2142201 Date: 15/05/2019
Subject Name: Mining Machinery-I
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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What do you mean by non-stranded rope? [03]
Differentiate between Lang's lay and Ordinary lay with neat sketch. [04]
Explain main & tail rope haulage with neat sketches. [07]
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Write short note on shuttle car. [03]
Explain various types of aerial ropeway system. [04]
Describe in detail different types of rope capels used in wire rope. [07]
OR
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An endless haulage operates on a roadway 700 m long dipping at 1 in 12 and draws 600 tonnes of coal a shift (1 shift = 7.5 hours effective time). An empty tub weighs 500 kgf and its carrying capacity is 1000 kgf of coal. The rope weighs 3.2kgf/m, tub friction is 1/50 and rope friction is 1/20. Speed of the rope is 5 km/hr. Estimate the power required by the motor. The loads are pulled up the gradient. [07]
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Discuss the various applications of aerial ropeway. [03]
Describe the advantages of compressed air over other power sources. [04]
Explain pipe line and distributions of compressed air used in mines. [07]
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OR
Discuss the important feature of a good haulage track [03]
State the type of rope to be used for: [04]
- Coal Cutting Machine
- Winding Rope
- Haulage Ropes
- Dragline Hoist Rope
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What do you mean by rope splicing? Describe the full procedure of splicing a wire rope with neat sketch. [07]
Write short note ‘on Clifton pulley. [03]
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A locked coil wire rope has a diameter of 45 mm. If the steel has a tensile strength of 170 kg/mm², find out the total mass of the rope and breaking strength in SI units if the length of the rope is 150 m. [04]
What are the different types of safety devices used on haulage roads? Explain with neat sketches. [07]
OR
What is space factor of wire rope? How mass and strength of wire ropes is determined? [03]
Discuss the factors affecting the selection of wire rope? Also explain the care of wire ropes during storage and use. [04]
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Why rope clips are used in rope haulage system? Explain different types of rope clips with neat sketch. [07]
What are the limitations on the use of different types of locomotives in underground mines? [03]
A direct rope haulage pulls 12 loaded tubs at a time up an incline dipping at 1 in 8. An empty tub weighs 350 kg and has a capacity of 950 kg of mineral. Length of the roadway covered by the haulage is 600 m. The rope diameter is 35 mm. Rope speed is 10 km/hr. Coefficient of friction for the tubs and for rope is 1/40 and 1/20 respectively. Find the power required by the engine. [04]
OR
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Discuss the advantages of gravity rope haulage. [07]
State the limitations for the working of endless rope haulage system. Also state its advantages and disadvantage. [03]
What are the different types of locomotives used in Underground coal mines? Explain diesel locomotive in detail. [04]
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