B.TechSemester 52024-25Machine DesignBME502
View PDFDownload

Machine Design (BME502) - AKTU Question Paper 2024-25

B.Tech · Semester 5 · Free PDF Download

This is the official AKTU Machine Design Previous Year Question Paper for B.Tech Semester 5, academic session 2024-25. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.

Course:B.Tech
Semester:Semester 5
Session:2024-25
University:AKTU / UPTU

Rate this paper

Questions Asked in 2024-25

Machine Design (BME502) — complete question paper · 70 marks · 3 Hours

Section AAttempt all questions in brief. 2 x 07 = 14
  • a
    Explain preferred numbers in machine design. 1 K 2
  • b
    Define the term bearing characteristic number. 2 K 2
  • c
    Describe the following: (i) Helix angle of helical gear (ii) Addendum circle of gear
  • d
    What is meant by pitch po int in gear design? 4 K 4
  • e
    What is foot step bearing? 4 K 4
  • f
    What is function of piston in IC Engine? 5 K 5
  • g
    What is octane number? 5 K 5
Section BAttempt any three of the following: 07 x 3 = 07
  • a
    Write shorts notes on: i) Notch sensitivity ii) Stress concentration iii) Endurance stress iv) Fatigue failure
  • b
    An eccentrically loaded lap riveted joint is to be designed for a steel bracket as shown in Fig. The bracket plate is 25 mm thick. All rivets are to be of the same size. Load on the bracket, P = 50 kN; rivet s pacing, C = 100 mm; load arm, e = 400 mm. P ermissible shear stress is 65 MPa and crushing stress is 120 MPa. D etermine the size of the rivet s to be used for the joint
  • c
    A pair of parallel helical gears consists of a 20 teeth pini on meshing with
  • a
    100 teeth gear. The pinion rotates at 720 rpm. The normal pre ssure angle is 20°, while the helix angle is 25°. The face width is 4 0 mm and the normal module is 4 mm. The pinion as well as the gear is ma de of steel 4OC8 (S ut = 600 N/mm 2) and heat treated to a surface hardness of 300 BHN. The service factor and the factor of safety are 1.5 an d 2 respectively. Assume that the velocity factor accounts for the dynamic load and calculate the power transmitting capacity of gears
  • d
    Derive the expression for dynamic load rating capacity of ro lling contact bearing under variable load
  • e
    The cylinder of four stroke diesel engine has a following sp ecifications: Brake power =5KW, Speed=600rpm, indicated mean effective pressure=0.5MPa, make suitable assumption and calculate: i) Bore and length of the cylinder liner ii) Thickness of cylinder liner iii) Thickness of cylinder head iv) Size, number and pitch of studs
Section CAttempt any one part of the following: 07 x 1 = 07
  • a
    A plate made of steel having ultimate tensile strength 440N/ mm2 in hot rolled and normalized condition is shown in fig. It is subjecte d to a completely reverse axial load of 30 kN. The notch sensitivity f actor q can be taken as 0.8 and the expected reliability is 90%. The fa ctor of s a f e t y i s 2 . T h e s i z e f a c t o r c a n b e t a k e n a s 0 . 8 5 . D e t e r m i n e t he plate thickness for infinite life
  • b
    What are the reasons for the use of alloy steels in machine design parts? How do you classify materials for engineering use?
  • a
    A solid circular shaft is subj ected to a bending moment of 3000 N-m and
  • a
    torque of 10000 N-m. The shaft is made of 45C8 steel having u ltimate Assuming a factor of safety as 6, determine the diameter of the shaft
  • b
    Write down the short notes on: i) Spline ii) Feather key iii) Woodruff key iv) Keyway
  • a
    I t i s r e q u i r e d t o d e s i g n a s p u r g e a r s p e e d r e d u c e r f o r a c o mpressor running at 250 rpm driven by a 7.5 kW, 1000 rpm electric motor. The centre distance between the axes of the gear shafts should be e xactly 250 mm. The starting torque of the motor can be assumed to be 150% of the rated torque. The gears are made of carbon steel 50C4 (S ut = 7 0 0 N/mm2). The pressure angle is 20°. The factor of safety is 2 for preliminary design based on the use of velocity factor. (i) Design the gears and specify their dimensions. (ii) Assume that the gears are manufactured to meet the requirements of Grade 6 and calculate the dynamic load by using Buckingham’s equation
  • b
    A worm drive transmits 15 kW at 2000 r.p.m. to a machine car riage at 75 r.p.m. The worm is triple thr eaded and has 65 mm pitch diame ter. The worm gear has 90 teeth of 6 mm module. The tooth form is to be 20° full depth involute. The coefficient of friction between th e mating teeth may be taken as 0.10. Calculate: 1. tangential force acti ng on the worm; 2. axial thrust and separating force on worm; and 3. effi ciency of the worm drive
  • a
    Explain the following term- i) zero film bearing ii) thin film bearing iii) thick film bearing iv) dynamic load rating capacity
  • b
    A journal bearing is proposed for steam engine. The load on the journal is 3 kN, diameter mm, length 75mm, speed 1600 rpm, diametral clearance 0.1 mm and ambient temperature 15.5°C. Oil used is SA E 10 and oil film temperature is 60°C. Determine the heat generated and heat dissipated. Take absolute viscosity at 60°C of SAE 10 is 0.014kg/m-s
  • a
    Design a cast iron piston for a single acting four stroke en gine for the
    following data: Cylinder bore = 100 mm; Stroke = 125 mm; Maximu m
gas pressure = 5 N/mm 2; Indicated mean effective pressure = 0.75
N/mm2; Mechanical efficiency = 80%; Fuel consumption = 0.15 kg per
brake power per hour; Higher calorific value of fuel = 42 × 103  kJ/kg;
Speed = 2000 r.p.m.
Any other data required for the design may be assumed
  • b
    State the function of the following for an internal combusti on engine piston

Question text is extracted from the official AKTU question paper PDF above. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.

Repeated Questions — BME502

Questions that appeared in more than one session, found by comparing 2 years of Machine Design papers (2024-25, 2025-26)

2x

100 teeth gear. The pinion rotates at 720 rpm. The normal pre ssure angle is 20°, while the helix angle is 25°. The face width is 4 0 mm and the normal module is 4 mm. The pinion as well as the gear is ma de of steel 4OC8 (S ut = 600 N/mm 2) and heat treated to a surface hardness of 300 BHN. The service factor and the factor of safety are 1.5 an d 2 respectively. Assume that the velocity factor accounts for the dynamic load and calculate the power transmitting capacity of gears

Appeared in: 2024-25 · 2025-26

Machine Design — Other Year Papers

AKTU Machine Design PYQs from other sessions

Machine Design2025-26Machine Design2021-22Machine Design2022-23

More B.Tech Semester 5 (2024-25) Papers

Other subjects from same semester and session

Bio Medical Signal Processing2024-25Turbo Machines2024-25Essence Of Indian Traditional Knowledge2024-25Cloud Computing2024-25Design And Analysis Of Algorithm2024-25Computer Vision2024-25Advance Manufacturing Processes2024-25Constitution Of India2024-25
View all B.Tech Semester 5 2024-25 papers →

Syllabus & More PYQs

Paper solve karne se pehle unit-wise syllabus dekh lo

AKTU 3rd Year PYQs — All Branches