JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III TRACTOR SYSTEMS AND CONTROLS Previous Question Paper (April - 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
What is the function of clutch?
Answer
The clutch serves to connect and disconnect the engine power from the transmission system. It allows the tractor to be started, stopped, and shifted between gears without stalling the engine.
What is the principle of working of Ratchet and Pawl arrangement mechanism?
Answer
The ratchet and pawl mechanism operates on the principle of intermittent motion. The pawl is a pivoted lever that engages with the teeth of a ratchet wheel, allowing rotation in one direction while preventing reverse motion by locking against the teeth.
Write the expressions for the Mechanical advantage and Torque ratio in gears.
Answer
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What are the functions of Differential lock?
Answer
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What are the components of a tractor brake system?
Answer
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What is a Torque converter? Where is it used? What is its key characteristic?
Answer
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What are the four power outlets of a tractor?
Answer
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Define Rimpull and Rolling resistance.
Answer
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What are the types of tractor chassis frames?
Answer
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How do you measure the PTO performance?
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Part B
Explain the functions of a power transmission system in tractor.
Answer
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What are the five symptoms of a worn – out clutch? Explain.
Answer
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A cone clutch with cone angle 25° is to transmit 8 kW at 750 rpm. The normal intensity of pressure between the contact faces is not to exceed 0.15 MPa. The coefficient of friction is 0.25. If the face width is 1/5th of the mean diameter, find: (a) the main dimensions of the clutch, and (b) the axial force required while running.
Answer
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With a neat sketch, explain the working of a sliding mesh gear box.
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Describe the functions of crown wheel.
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What are the common types of final drives used in Tractors? Describe, with a sketch, any one type of such drive.
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With a neat sketch, describe the working of Differential in a gear box.
Answer
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With the help of a sketch, describe the construction and operation of a fluid coupling.
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Describe the working of hydraulic steering mechanism.
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What are the basic components of hydraulic control system? Explain its principle of operation.
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With a sketch, explain the working of a mechanical brake system for tractors.
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Explain the different types of Power take-off outlets.
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What is a Draw – bar? Describe its construction details.
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Define Traction and Coefficient of traction. What are the factors affecting the ‘Coefficient of traction’?
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Discuss the methods for improving traction and traction efficiency.
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Describe the Suspension method to determine the centre of gravity of wheeled and track type tractors.
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What is tractor chassis? Explain the functions of tractor chassis frame.
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Describe the tractor power take – off test with AC dynamometer.
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How do you determine the location of C.G. of tractor using the weighing method? Explain.
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