Diploma Design of Machine Elements Model Question paper
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Model Exam Question Paper
Subject: Design of Machine Elements Marks: 100
(N.B: Part A : Answer all questions. Each questions carries 5 marks.
Part B : Answer all questions. Answer either A or B. Each Each question carries 15 marks.
PSG Data book and approved data books are permitted.)
Part A (5 X 5 = 25 Marks)
- Name the type of steel with its composition designated as
T 75 W 18 Co 6 Cr 4 V 1 Mo 75 (or) XT 75 W 18 Co 6 Cr 4 V 1 Mo 75
- What are the types of key?
- Compare V belt with flat belt.
- How are bearings classified?
- Explain briefly concurrent engineering.
Part B : (5 X 15 = 75 Marks)
- (A) A mild steel rod supports a tensile load of 50kN and the stress in the rod is limited to 100
N/mm2 . Determine the size of the rod when the section is (a) circular (ii) square and (iii) rectangle with width = 3 x thickness.
(OR)
(B) Design a sleeve and cotter joint to take a load of 70 kN, assuming that all the parts are made of the
same material. The permissible stresses are 60 MPa in tension, 125 MPa in compression and 70 MPa in
shear respectively.
- (A) A shaft made of mild steel is required to transmit 100 kW at 300 r.p.m. The supported length of
the shaft is 3 metres. It carries a central load 1500 N. Assuming the safe value of shear stress as 60
N/mm2 and the safe value of tensile or compressive stress as 80 N/mm2. determine the diameter of the shaft.
(OR)
(B) Design a protective type of cast iron flange coupling for a steel shaft transmitting 15KW at 200
rpm. The allowable shear stress is 40N/mm2. The working stress in the bolts should not exceed 30
N/mm2 .Assume that the same material is used for shaft and key and that the crushing stress is twice the
value of shear stress. The maximum torque is 20% greater than the full load torque. The shear stress for
cast iron is 14N/mm2 . Check your design for hub, key, flange and bolts.
8.(A) Select a flat belt from manufacturer’s catalogue to transmit power of 15KW at 1200 rpm. The
speed of the driven pulley is 450 rpm. The maximum centre distance between the shafts is 2m. Assume
steady load
(OR)
(B) Design a V-belt drive using manufacturer’s data to the following specifications.
Power to be transmitted =10 kW
Speed of driving pulley=1000 rpm
Speed of driven pulley= 300 rpm
Diameter of driving pulley= 150 mm
Diameter of driven pulley= 500 mm
Centre distance between pulleys = 925 mm
Service = 16 hrs / day
9 (A) Design a journal bearing for a centrifugal pump from the following data.
Load on the journal: 20 kN
Diameter of the journal : 100 mm . Take L/D = 1.55
Speed: 900 rpm
Types of oil used: SAE 10
Absolute viscosity at 55°C: 17 centipoise
Ambient temperature of oil: 15.5 °C
Maximum bearing pressure : 1.5 N/mm2
Heat dissipation co-efficient : 1232 J/s/m2/°C
Calculate also mass of lubricating oil required for artificial cooling, if rise of temperature of oil is limited to 10°C
(OR)
(B) Explain the design procedure of spur gear.
10 (A) (i) Explain the Shigley’s design process (10)
(ii) Explain the steps involved in finite element analysis of a component?(5)
(OR)
(B) Briefly explain the CSG and B-REP technique of solid modelling.(15)
