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Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Seventh Semester B.Tech Degree Examination (Regular and Supplementary), December 2020

Max. Marks: 100

1 a)
b)

2 a)
b)

3

4

5

6

Course Code: AU401
Course Name: AUTOMOTIVE SYSTEM DESIGN

Note: Logically assume values which are not provided.
APJKTU approved data book is permitted for the examination.

PART A
Answer any two full questions, each carries 15 marks.

List down the parameters that contribute to the air resistance of a vehicle.
Provide the equation to calculate the same.

A lorry with a GVW of 39868N is travelling up a gradient of 1 in 20 at a speed
of 32km/h. The road resistance is 23 N per 100014. There is a head wind blowing
at 161൩൪. Determine the power required to propel the vehicle under the given
condition if the projected area is 2.8m’. Take the value of K, as 0.03708 and the
efficiency of transmission is 85%.

Explain the following terms: i).Tractive effort; ii) Indicated mean effective
pressure; iii)Frictional horse power; iv) Excess driving force

Explain the methodology to graphically determine the maximum acceleration
that can be obtained from a vehicle.

Derive the equation for finding the velocity, acceleration, angular velocity,
angular acceleration and inertia force due to reciprocating masses in an engine
cylinder.

PART 8
Answer any two full questions, each carries 15 marks.

Design a valve gear with convex cam profile for the following details:

Cylinder Bore=75mm; Engine speed at nominal power = 5600rpm;; Mean piston
speed= 14m/s; Mixture velocity in the seat passage section at maximum lift of
inlet valve= 95m/s; Angle of opening of inlet valve 16° BTDC; Angle of closing
of inlet valve = 50° after BDC.

List down the procedure for finding the parameters for a harmonic cam profile.
Design a lubrication system consisting of gear oil pump, centrifugal oil filter and

oil cooler for the following specifications for a petrol engine:

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Duration: 3 Hours

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