JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV Year AUTOMOTIVE ELECTRICAL AND AUTOTRONICS Previous Question Paper (November/December- 2018 - R15)
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.
Part A
Define Battery Capacity. On what factors does it depend? How does the capacity change with temperature?
Answer
Battery Capacity is the total amount of electrical energy a battery can deliver, typically measured in Ampere-hours (Ah). It depends on the number and size of plates, the quantity and specific gravity of the electrolyte, and the age of the battery. Capacity decreases as temperature drops because the chemical reaction rate slows down and internal resistance increases.
Distinguish between slow rate charging and Quick rate charging.
Answer
Slow rate charging uses a low current over a long period (typically 10-20 hours) to fully restore charge without damaging the plates. Quick rate charging uses a high current for a short duration (1-2 hours) to provide a rapid boost, but it generates significant heat and can cause plate buckling or active material shedding if used excessively.
What is Ignition Advance? Why is it necessary?
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Explain the principle of Distributor type electronic ignition.
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What are the Type I and Type II head lamps used in automobiles?
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List the different outside or exterior lights provided on an automobile.
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What are Hybrid Electric vehicles, and what are their advantages over conventional vehicles?
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Distinguish between Series system Hybrid vehicles and Parallel system Hybrid vehicles.
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What is the difference between Transmissions and Transaxles?
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Explain the functions of a Clutch in an automobile.
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Part B - Unit I
Explain, in detail, the troubles encountered in automobile batteries, their causes and remedies.
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Describe the following tests conducted to ascertain the conditions of a battery: Open volt test, High discharge test, Cadmium test.
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Part B - Unit II
Explain the functions of the main components of a Battery ignition system.
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Discuss the maintenance and fault diagnosis of automobile ignition system.
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Part B - Unit III
Draw the wiring diagram for a typical automotive wiring system, and explain the standard symbols in the diagram. Explain the method of usage of these diagrams.
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Discuss the different types of Head lamps used in automobiles, their construction and wiring systems. Also, explain about the working of fog lamps.
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Part B - Unit IV
Explain about the component sizing of a plug – in hybrid electric power train.
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Discuss the force – velocity characteristics of hybrid electric vehicles.
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Explain the conceptual advantages of a hybrid vehicle over a conventional vehicle in terms of overall energy efficiency. What are the counterbalancing factors reducing hybrids’ energy advantage?
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What is Tractive force, and what are the resistive forces acting against the tractive force?
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Part B - Unit V
Distinguish between DC drives and AC drives for electric motors.
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Name and explain the components of a gear box.
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Sketch and explain any one type of brake used in automobiles.
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What is Hybrid control strategy? Explain.
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