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EndsemNov 20242019 patternBE Mech

Automobile Design SPPU Endsem Question Paper Nov 2024

All 8 questions from this SPPU endsem paper, as printed. Read them here or open the PDF.

Open the PDFMost repeated Automobile Design questions
Subject code
402044 A
Pattern
2019 pattern
Exam
Endsem
Session
Nov 2024
Max. marks
70
Time
2½ Hours
Semester
VII
Paper code
[6354]-615

Printed for: B.E. (Mechanical Engineering)

Instructions to the candidates

  1. Solve Q1 or Q2, Q3 or Q4, Q5 or Q6, Q7 or Q8.
  2. Neat diagrams must be drawn wherever necessary.
  3. Figures to the right indicate full marks.
  4. Use of electronic pocket calculator is allowed.
  5. Assume suitable data if necessary.

Questions

  1. Q1

    1. a)

      A propeller shaft is required to transmit 50 kW power at 600 rpm. It is a hollow shaft, having an inside diameter 0.8 times of the outside diameter. It is made of steel (Syt = 380 N/mm 2 ) and the factor of safety is 4. Calculate the inside and outside diameters of the shaft. Assume (Ssy=0.5Syt)

      [9]
    2. b)

      Describe with neat sketch the working of power steering unit.

      Also asked:Nov 2025

      [9]

  2. Q2

    1. a)

      Explain with neat sketch full floating axle and state its applications.

      Also asked:May 2025

      [8]
    2. b)

      Pair of bevel gears with 20º pressure angle, consists of a 20 teeth pinion meshing with a 30 teeth gear. The module is 4 mm, while the face width is 20 mm. The material for the pinion and gear is steel 50C4 (Sut = 750 N/mm 2 ). The gear teeth are lapped and ground (Class-3) and the surface hardness is 400 BHN. The pinion rotates at 500 rpm and receives 2.5 kW power from the electric motor. The starting torque of the motor is 150% of the rated torque. Determine the factor of safety against bending failure and against pitting failure.

      [10]

  3. Q3

    1. a)

      Write a short note on: i) Classification of pressed steel disc wheel ii) Factors affecting tyre life

      Also asked:May 2025

      [9]
    2. b)

      Explain limitations and benefits of radial ply tyre over the cross ply tyre. 2

      Also asked:May 2025

      [8]

  4. Q4

    1. a)

      Explain with neat sketch construction and working of hydraulic brake system for a vehicle

      Also asked:Nov 2025

      [9]
    2. b)

      A circular road course track has a radius of 500 m and is banked to 10°. If the coefficient of friction between the road and tyre is 0.25. Compute: i) The maximum speed to avoid slipping and ii) The optimum speed to avoid wear and tear on the tyres.

      Also asked:Nov 2025

      [8]

  5. Q5

    1. a)

      Explain the working and construction of the shock absorber. State its advantages.

      [9]
    2. b)

      Design a Helical coil spring with Pmax = 7.5 kN. The mean coil diameter (D) Should be 150 mm from space stiffness of the spring. k = 75 N/mm. Spring made of coil hardened and tempered steel wire (Sut = 1250 N/mm 2 ). Permissible shear stress=30% of Ultimate tensile strength (Sut) G = 81370 N/mm 2 . Assume a WahI’s Stress factor, K = 1.213, Calculate: i) Spring Index,C ii) Wire diameter, d iii) Number of active coils, N

      [9]

  6. Q6

    1. a)

      Explain with neat sketch active suspension system with its limitations and advantages.

      [9]
    2. b)

      A semi-elliptic leaf spring used for automobile suspension consists of three extra full-length leaves and 15 graduated-length leaves, including the master leaf. The centre-to-centre distance between two eyes of the spring is 1 m. The maximum force that can act on the spring is 75 kN. For each leaf, the ratio of width to thickness is 9:1. The modulus of elasticity of the leaf material is 207 000 N/mm 2 . The leaves are pre- stressed in such a way that when the force is maximum, the stresses induced in all leaves are same and equal to 450 N/mm 2 . Determine: i) The width and thickness of the leaves; ii) The initial nip; and iii) The initial pre-load required to close the gap C between extra fulllength leaves and graduated-length leaves. 3

      Also asked:Nov 2025 ·May 2025

      [9]

  7. Q7

    1. a)

      Explain the following: i) Mechanical packaging ii) Automotive industry packaging.

      Also asked:May 2025

      [10]
    2. b)

      List and explain ergonomic considerations in design of automobile.

      [7]

  8. Q8

    1. a)

      Explain with suitable examples use of anthropometry in automobile design.

      [9]
    2. b)

      Write a note on applications of biomechanics in vehicle. eeee

      Also asked:Nov 2025 ·May 2025

      [8]