JNTU
JNTU B.Tech III TRACTOR SYSTEMS AND CONTROLS Previous Question Paper (December - 2018 - R15)
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. Each question carries 10 marks and may have a, b, c as sub questions. Illustrate your answers with NEAT sketches wherever necessary.
Part A
Where is the clutch located, if : (i) the engine is placed crosswise of the frame, (ii) the engine is placed lengthwise of the frame
Answer
(i) When the engine is placed crosswise, the clutch is located between the engine and the transaxle. (ii) When the engine is placed lengthwise, the clutch is located between the engine flywheel and the gearbox input shaft.
List the components in the power transmission system of tractor.
Answer
The primary components of a tractor power transmission system include the clutch, gearbox (transmission), differential, final drives, and the power take-off (PTO) shaft.
What is the necessity for providing gear box in tractors?
Answer
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Explain the functions of crown wheel in differential unit.
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What types of brakes are used in tractors?
Answer
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How a fluid coupling can act as a mechanical clutch? Explain.
Answer
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Explain the terms Traction efficiency and Crawler tractor.
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What is an engine speed Power take-off, and how does it work?
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What do you understand by Tractor engine performance?
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How do you measure the Drawbar performance?
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Part B
Explain the tips for preventive maintenance of clutches.
Answer
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Describe, with a neat sketch, the working of a single plate friction clutch.
Answer
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A multiple disc clutch has six active friction surfaces. The power transmitted is 20 kW at 400 rpm. Inner and outer radii of the friction surfaces are 90 mm and 120 mm respectively. Assuming uniform wear with a coefficient of friction 0.3, find the maximum axial intensity of pressure between the discs.
Answer
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Explain the working of Change-speed gears in tractors.
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Describe the functions of Final drive unit in gear box.
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With a neat sketch, explain the working of a constant mesh gear box.
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Derive the expressions for (i) Mechanical advantage in gears, and (ii) Torque ratio in gears.
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With the help of a sketch, describe the construction and operation of a torque converter.
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Describe the working mechanism of a hydraulic brake system.
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What are the qualities of a good steering mechanism? Write the main parts of a steering mechanism.
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Describe the working of hydraulic position control system used in tractors.
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Describe, with a sketch, the belt pulley constructional details of tractor power out let.
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Explain the different types of Crawler tractors, their features, and working mechanism.
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What is Wheel Slip or Track slip? How do you measure / adjust it? Explain the difference between Wheel Slip and Wheel Skid.
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What is Rolling resistance? What is it caused by? How do you estimate the rolling resistance?
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Describe the tractor power take – off test with eddy current dynamometer.
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Explain the Balancing method to determine the centre of gravity of wheeled and track type tractors.
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Discuss the mechanics of tractor chassis.
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Describe the Belt or pulley shaft test at varying load.
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