Gujarat Technological UniversitySummer 2026 examination

GTU 2171909 Machine Design Summer 2026 Question Paper & PDF

B.E. · Mechanical Engineering · Semester 7 · Subject code 2171909
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Total
70 marks
To pass
23 marks (33%)
Duration
2.5 Hours 2:30 PM – 5:30 PM
Questions
5 with internal choice
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Q.1

14 Marks
(a)
3 marks
Explain different types of gear tooth failures.
(b)
4 marks
Explain interference and undercutting in involute gear tooth profile.
(c)
7 marks

A pair of straight teeth spur gears, having 20° involute full depth teeth is to transmit 12 kW at 300 r.p.m. of the pinion. The speed ratio is 3 : 1. The allowable static stresses for gear of cast iron and pinion of steel are 60 MPa and 105 MPa respectively. Assume the following: Number of teeth of pinion = 16; Face width = 14 times module; Velocity factor Cv = 4.5/(4.5+v) v being the pitch line velocity in m / s; and tooth form factor (y) =–0.154 - (0.912 /No. of teeth).Determine the module, face width and pitch diameter of gears. Check the gears for wear; given σes= 600 MPa; EP= 200 kN/mm2and EG= 100 kN/mm².

Q.2

14 Marks
(a)
3 marks
What is Lewis form factor? How does it vary with number of teeth on gear?
(b)
4 marks

List the major advantages of using geometric progression of for speed regulation in a gear box.

(c)
7 marks

Explain the design procedure of helical gear based on beam strength and wear strength theory.

(c)
7 marks

What is range ratio in gear box design? Explain the procedure to construct speed diagram (ray diagram) for gear box.

Q.3

14 Marks
(a)
3 marks
Explain the classification of sliding contact bearings.
(b)
4 marks
What are the advantages of hydrodynamic lubrication?
(c)
7 marks

A full journal bearing of 50 mm diameter and 100 mm long has a bearing pressure of 1.4 N/mm². The speed of the journal is 900 r.p.m. and the ratio of journal diameter to the diametral clearance is 1000. The bearing is lubricated with oil whose absolute viscosity at the operating temperature of 75°C may be taken as 0.011 kg/m-s. The room temperature is 35°C. Find :1. The amount of artificial cooling required, and 2. The mass of the lubricating oil required, if the difference between the outlet and inlet temperature of the oil is 10°C. Take specific heat of the oil as 1850 J / kg / °C.

(a)
3 marks
Define static and dynamic load carrying capacities of rolling contact bearings.
(b)
4 marks
Discuss advantages of rolling contact bearings over sliding contact bearings.
(c)
7 marks

A single row angular contact ball bearing number 310 is used for an axial flow compressor. The bearing is to carry a radial load of 2500 N and an axial or thrust load of 1500 N.Assuming light shock load, determine the rating life of the bearing.

Q.4

14 Marks
(a)
3 marks
What are the typical causes of failure in rolling contact bearings?
(b)
4 marks
Give classification of cranes.
(c)
7 marks

Classify material handling equipment. What are the basic objectives that a material handling equipment should fulfil?

(a)
3 marks
Explain the designation used for a steel wire rope.
(b)
4 marks
Explain briefly about piston rings.
(c)
7 marks

Determine the dimensions of cross-section of the connecting rod for a diesel engine with the following data: Cylinder bore = 100 mm Length of connecting rod = 350 mm Maximum gas pressure = 4 MPa Factor of safety =

Q.5

14 Marks
(a)
3 marks
Name the materials used for engine piston.
(b)
4 marks

what is the function of connecting rod? what are the forces acting on the connecting rod?

(c)
7 marks
The following data is given for the piston of a four-stroke diesel engine:

Cylinder bore = 250 mm Maximum gas pressure = 4 MPa Bearing pressure at small end of connecting rod= 15 MPa Length of piston pin in bush of small end = 0.45D Ratio of inner to outer diameter of piston pin = 0.6 Mean diameter of piston boss= 1.4 * outer diameter of piston pin Allowable bending stress for piston pin= 84 N/mm2 Calculate:

i)outer diameter of the piston pin;
ii)inner diameter of the piston pin;
iii)mean diameter of the piston boss; and
iv)check the design for bending stresses.
(a)
3 marks
Give practical applications of wire rope.
(b)
4 marks
Explain the design of hook in brief.
(c)
7 marks

A 6 * 19 wire rope with bre core and tensile designation of 1570 is used to raise the load of 20 kN as shown in Figure. The nominal diameter of the wire rope is 12 mm and the sheave has 500 mm pitch diameter. Determine the expected life of the rope assuming 500 bends per week.

GTU Machine Design (2171909) Summer 2026 Question 5 OR (c) Diagram

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About this paper

Official Gujarat Technological University (GTU) examination paper for Machine Design (Summer 2026, B.E. · Mechanical Engineering, Sem 7). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.

Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.

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