Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech II MINE MECHANISATION-I Previous Question Paper (May - 2019 - R16)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit.
Part A
(25 Marks)
What are the different types of couplings?
Answer
Couplings are primarily classified into two types: Rigid couplings, which connect shafts that are perfectly aligned (e.g., flange, sleeve, or muff couplings), and Flexible couplings, which allow for slight misalignment or absorb shocks and vibrations (e.g., pin-bush, universal, or gear couplings).
Describe about the Eccentric?
Answer
An eccentric is a circular disc or wheel mounted on a shaft such that its center of rotation is offset from the geometric center of the disc. It is primarily used in mechanical systems to convert rotary motion into reciprocating linear motion. In mining machinery, it is commonly employed in mechanisms like shaker conveyors or pump drives to provide a stroke or throw proportional to the degree of eccentricity.
Under what circumstances signaling is to be provided on a haulage roadway?
Answer
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What is rope splicing?
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What is the importance of sleepers and ballast on a track?
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What are the limitations of mono-cable aerial ropeways?
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What are the pre-requisites for use of Trolley wire locomotives in mines?
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What is the difference between the stage loader and an armoured face chain conveyor used in Longwall?
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What is the purpose of inter cooler in a compressor?
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What are the fittings on receiver of a compressor?
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Part B
(50 Marks)
Describe the Hydraulic coupling and explain the principle of its working.
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The rpm of a motor is 675 and its diameter is 440 mm and the driven pully is having 660 mm, what is the rpm of the driven shaft?
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What are the limitations of chain drives?
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Derive the equation for the power transmitted by a belt with a simple sketch.
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Explain the selection of Wire ropes.
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An Endless rope haulage operates in a roadway of 1200 m long dipping at 1 in 15 and draws 660 tonnes of coal in shift of 8 hours and 6 hours of effective time. The loads weighs 1.5 tonne each, are pulled up gradient and the empty weigh 0.5 tonne. The rope weighs 3 kgf/m, tub friction is 1/50 and rope friction is 1/10. Speed of the rope is 4 km/hr. Calculate the power required at the surge wheel?
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What are the different safety appliances used on haulage road?
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Explain about reliance capel is to be fitted on a winding rope.
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Describe the essentials of a good haulage track.
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A locomotive weighing 20 tonnes travels round a curve of 90 m radius at a speed of 36 kmph. If the gauge of rail is 1 meter, what should be the super-elevation of outer rail over the inner rail so that there is no thrust between the flanges of the outer wheels and the out rail?
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Explain the different crossings and turn outs used on a haulage track with a simple sketch.
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Describe the a) Construction, b) Operation, c) Applications, d) Advantages and e) Limitations of Diesel Locomotives.
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Explain the construction, installation, operation and application of High angle Conveyors in open cast mines?
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Write short notes on unloading of compressors, moisture in compressed air and its effect on efficiency?
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Find the work done in a compressor in compressing the air isothermally with the following details: Initial abs pressure = 2 × 10^5 N/m^2, Final abs pressure = 8 × 10^5 N/m^2, Initial volume = 7 m^3.
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Describe the different types of compressors used in Mining Industry for different purposes?
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Discuss about the difference between reciprocating and centrifugal compressors?
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