15AT61T: Automotive Mechanics Auto 6th Sem Syllabus for Diploma DTE Karnataka C15 Scheme

Automotive Mechanics detail DTE Kar Diploma syllabus for Automobile Engineering (AT), C15 scheme is extracted from DTE Karnataka official website and presented for diploma students. The course code (15AT61T), and for exam duration, Teaching Hr/week, Practical Hr/week, Total Marks, internal marks, theory marks, duration and credits do visit complete sem subjects post given below. The syllabus PDFs can be downloaded from official website.

For all other auto 6th sem syllabus for diploma c15 scheme dte karnataka you can visit Auto 6th Sem Syllabus for Diploma C15 Scheme DTE Karnataka Subjects. The detail syllabus for automotive mechanics is as follows.

Pre-requisites:

Knowledge of Applied Science, Engineering mechanics, Mechanics of machines
and Machine Design.

Course Objectives:

Apply mechanical engineering science to Analyse engine and vehicle performance.

Course Outcomes:

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UNIT I:PERFORMENCE OF IC ENGINES. 10Hrs

Dynamometers-need-types, Prony Brake Dynamometer, Electrical Dynamometer.-hydraulic dynamometer-construction and working, Engine performance- determination of IP- BP- FP- MEP-IMEP-BMEP- Engine Torque – piston speed -Mechanical Efficiency-Thermal Efficiency- Indicated Thermal Efficiency- Brake Thermal Efficiency- Volumetric Efficiency,-Air Standard Efficiency- Relative efficiency -TFC-SFC- BSFC- ISFC- air fuel ratios determination of IP- Willan’s Back Trace MethodMorse Test, heat balance sheet, Performance Curves – Problems.

UNIT II: CLUTCH 07 Hrs

Clutch: Introduction, Derivation on Torque Transmitted through Single and Multi plates

Clutches – Uniform Intensity of Pressure- Uniform Rate of Wear Conditions, Problems on Uniform Rate ofWear Conditions.

UNIT III: GEARBOX 05 Hrs

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UNIT IV: STEERING 07 Hrs

Definitions: wheel base, wheel track, overall length, and front over hung, rear over hung, and turning
circle radii, derive equation for correct steering, Ackerman steering mechanism-Derive equation by Analytical method – derive expression for turning circle radii – problems.

UNIT V: BRAKES 11 Hrs

Definitions: Stopping Distance-Braking Efficiency-Braking Torque-Leading Shoe and TrailingShoe -Derive an Expression For Stopping Distance -Derive an Expression For weight transfer during braking-Derive Expressions for Braking of Vehicle Moving on Gradient, – Brakes Applied To Rear Wheels-Front Wheels and All Four Wheels- Equation for Braking Torque on Leading and Trailing Shoe – Mean Lining Pressure and Heat Generated – Problems.

UNIT VI: VEHICLE PERFORMANCE 11Hrs

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Text Books:

1. Automotive Mechanics – Dr.N.K. Giri (Khanna Publishers)
2. Automobile design Problem – R.S. Agarwal
3. Machine design – R.S. Khurmi & J.K. Gupta (S.Chand Publications) REFERENCES
4. Machine Design – Sharma & Agarwal
5. Machine design – R.S Kurmi
6. Machine design – Abdulah sharief

Suggested List of Student Activities:

Note: the following activities or similar activities for assessing CIE (IA) for 5 marks (Any one)

1. Each student should do any one of the following type activities or similar activities related to the course and before take up, get it approved from concerned course coordinator and HOD.
2. Each student should conduct different activity and no repetition is allowed.

1. List the Dynamometers, sketch and explain any one of them.
2. Collect the performance data of different 100cc engines analyze, grade the engines and submit the report.
3. Sketch the ideal Valve timing diagram and the actual, compare submit hand written report of 500 words.
4. Assignments related to subject.

Course Delivery:

• The course will be delivered through lectures
• Motivate student to take case study on performance parameters, power transmission and to inculcate him for self and continuous learning.

Model Question Paper:

(CIE)

1. A petrol engine consumes ‘2.63 kg of fuel per b.kwh. The mechanical efficiency of the engine is 78% and the compression ratio is 6.:1. The heating value is 43890 kJ/kg calculate the brake thermal efficiency, the ideal air standard efficiency and also the efficiency ratio. OR A four cylinder petrol engine has an output of
2. kw bp at 2000rpm.A Morse test was carried out and brake torque readings were 173., 165., 168. and 176. N-m respectively. For normal running at this speed specific fuel consumption is 3.7kg/bkwh. The lower heating value of the fuel is 43900kJ/kg. Calculate the mechanical efficiency and the brake thermal efficiency of the engine.
3. A plate clutch has three discs on the driving shaft and two discs on the driven shaft, providing four pairs of contact surfaces. The outside diameter of the contact surfaces is 240 mm and inside diameter 120 mm. Take |a = 3., find the total spring load pressing the plates together to transmit 23 kW power at 1575 revolution per minute. If there are 6 springs each of stiffness 13 kN/m each of the contact surfaces has worn away by 2.5 mm, find the maximum power that can be transmitted, assuming uniform wear. OR Maximum torque of a Ford V-8 engine of 81 mm bore 96 mm stroke is 245 N-m at 2000 r.p.m. Find the outside diameter of the clutch facing for a single plate dry clutch necessary to transmit this torque. Take mechanical efficiency as 85% and the inside diameter of facing as outside diameter. Assume a coefficient of friction of ‘3. and the allowable pressure on the facing as 245 kPa.

CIE ASSESSMENT FOR FINAL REVIEW

1. Average of three IA tests Marks 20marks
2. Activity 05mark

Model Question Paper:

PART-A 6×5=30 marks

1. A petrol engine working on Otto cycle has a clearance volume of 20% of the stroke volume. The engine consumes 1.7 liters of petrol per hour when developing
2. kW i.p. The specific gravity of petrol is 7.6 and its heating value is 43,900 kJ / kg. Determine the indicated thermal efficiency of the engine. Take y=4. for air
3. Explain any one dynamometer with a neat sketch
4. Explain with equation the torque transmitted through the clutch.
5. List different terms involved in terminology of spur gear
6. Define: Speed ratio, Gear ratio and diametrical Pitch
7. Explain Ackerman steering mechanism.
8. List the requirements of braking
9. Explain the brake fade
10. Find the rpm of the engine when the vehicle is moving at 60 Kph in top gear. Take the rear axle reduction to be 2.:1 and the diameter of the wheels as 500mm

PART-B 7×10=70 marks

1. The following readins were noted for a 4-cylinder, 4-stroke engine:

Diameter= 101 mm,
Stroke= 114 mm,
Speed= 1600 r.p.m,
Fuel consumption= ‘2.04 kg/min,
Heating value of fuel= 41800 kJ / kg,
Difference in tension on either side of brake pulley= 378N,
Brake circumference = 3.5m,
Assume a mechanical efficiency =83%, calculate

1. Brake thermal efficiency
2. Indicated thermal efficiency
3. Mean effective pressure of cylinder.
4. Petrol consumption per b.kWh.
2. An eight-cylinder automobile engine of ’87. mm bore and stroke ’85.mm and with a compression ratio of 7:1 is tested on dynamometer which has an arm of ‘5.335 m, long the dynamometer scale reading 400N and the speed of the engine 4000 r.p.m. During the ten minutes run the fuel consumption was ‘5.5 kg of gasoline the heating value of fuel was 45980kJ/kg. The quantity of air supplied was ‘4.4 kg/min at a pressure of 10×103 4 Pa and at temperature of 293k.find the following
1. BP developed
2. The b.m.e.p.
3. the b.s.f.c,
4. The brake thermal efficiency,
5. The volumetric efficiency,
6. the air consumption,
7. The air-fuel ratio.
3. A plate clutch has three discs on the driving shaft and two discs on the driven shaft, providing four pairs of contact surfaces. The outside diameter of the contact surfaces is 240 mm and inside diameter 120 mm. Take p = ‘3., find the total spring load pressing the plates together to transmit 23 kW power at 1575 revolution per minute. If there are 6 springs each of stiffness 13 kN/m each of the contact surfaces has worn away by ‘2.5 mm, find the maximum power that can be transmitted, assuming uniform wear.
4. In a constant mesh gearbox the clutch shaft pinion has 14 teeth and a lay shaft gear has 32 teeth. The number of teeth in the lay shaft gear wheels is 16, 19 and 21 . The differential drive pinion has 14 teeth and crown pinion has 62 teeth. The road wheel diameter is ‘6.5 m If the engine is running at a constant speed of 3200 rpm, find the various speeds of the vehicle in respective gears.
5. The distance L between the pivots of a car is ‘2.7 m The knuckle arms are ‘1.65 m long. The angle between the knuckle arm and the longitudinal axis of the car in the straight ahead position is 20 . The track is ‘4.2 m and L is 45% of the wheelbase. Find the radius of the path near side front wheel for correct steering to the right.
6. In a shoe-brake with leading and trailing shoes, the total actuating force of 471 N acts at a distance of ‘1.5 m from the pivot of the shoes which is ‘0.75 rn from the axis of the drum of radius ‘0.9 m? The shoes have symmetrical lining with coefficient of friction ‘4.5. If the effective radius of the friction force is ‘1. m, calculate the total braking torque, when
1. The actuating mechanism gives equal forces to the shoes;
2. when the actuating mechanism gives the shoes equal displacement
7. A bus weighing 124587 N is to be kept at a constant speed of 32 km/hr when going down a 3 km long slope (tan 0 = ‘1.). Suggest if the brakes should be used in this operation. If there are brakes on all four wheels and if the weight is shared equally by the wheels, calculate the heat dissipated at each brake when the brakes are used to control and limit the speed to 32 km/hr.
8. For a motor vehicle, the rolling resistance is given by, ’16. + ‘6.965 V and the air resistance by the expression ‘0.827 V2 the resistance being in N and V the speed in km/hr. If the transmission efficiency is 88%, calculate the b.kw required for a top speed of 128 km/hr assuming that the engine torque at 48 km/hr in top gear is 25% more than that at 128 km/hr and that the vehicle inertia corresponds to a weight of 17805N; calculate the acceleration in m/s2 at 48 km/hr.
9. A car of weight ‘13346. N is to be provided with an engine. The gear ratio is ‘8.: 1, the wheels are ‘6.1 m diameter and a transmission efficiency of 92% may be assumed. The rolling resistance on good macadam road is 13 N per 1000 N of weight and air resistance is equal to ‘0.6023 V2, where V is the forward speed in km per hour. The total inertia of the car may be assumed to be equivalent to a weight of ‘17793. N. The car has to have a maximum acceleration of ‘7.6 m/s2 at 56 km/hr. Calculate
1. the engine speed at 56 km/hr ;
2. the engine power which is needed at the above speed ;
3. the load which the car can pull on level in a trailer if the trailer weighs ‘4448. N at 54 km/hr.
1. List and explain the resistances offered against the movement of vehicle.
2. Deduce the relationship between engine revolutions and vehicle speed

For detail syllabus of all other subjects of BE Auto, C15 scheme do visit Auto 6th Sem syllabus for C15 scheme.

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