Subject Code: 2162001
GUJARAT TECHNOLOGICAL UNIVERSITY
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SEMESTER-VI(NEW) — EXAMINATION — SUMMER 2019
Subject Name: Design of Mechanisms - I
Time: 10:30 AM TO 01:00 PM
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Mention the applications of various types of springs. [03]
(b) What is mechanical advantage? Explain it in context of various types of levers. [04]
(c) State the Euler’s formula. What are the assumptions used to derive this formula? Mention the limitations of Euler’s formula. [07]
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OR
Q.2 (a) Write a short note on Standardization. [03]
(b) What is stress concentration? Suggest various remedies of it. [04]
(c) Write a short note on Factor of safety and Preferred numbers. [07]
OR
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Q.3 (a) Design a helical compression spring for a maximum load of 1500 N for a deflection of 25 mm using the value of spring index as 5. The maximum permissible shear stress for spring wire is 420 MPa and modulus of rigidity is 84 kN/mm². [07]
(b) What is bearing pressure? Explain it with at least one engineering application of the same. [03]
(c) A seamless spherical shell, 950 mm in diameter and 10 mm thick is being filled with a fluid under pressure until its volume increases by 120 X 10³ mm³. Calculate the pressure exerted by the fluid on the shell, taking modulus of elasticity for the material of the shell as 200 KN/mm² and Poisson’s ratio as, 0.3. [04]
OR
Q.3 (a) Efficiency of self locking screw is less than 50%, why? [07]
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(b) Explain the bolts of uniform strength. Explain methodologies to obtain the uniform strength. [03]
(c) Explain the force analysis for toggle type of screw jack. [04]
Q.4 (a) Derive the expression for torque required to raise the load in context of power screw. [07]
(b) Explain the use of key. Mention various failures of it. [03]
(c) Explain the procedure to design a cotter in cotter joint during bending failure. [04]
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OR
Q.4 (a) Differentiate between shaft and Axle. [03]
(b) How to design a frame of Hacksaw blade? Explain with steps. [04]
(c) Explain at least three cases which uses bolted joint with rough sketches. Analyze any one case. [07]
Q.5 (a) The shaft running at 180 rpm transmit 300 KW Power. The working condition to be satisfy by the shaft are:
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- The shear stress must not exceed 55 MPa
- The angle of twist must not be more than 2° on a length of 16d
(b) Explain the concept of combine loading by considering a suitable engineering application. [03]
(c) What is shear? Explain various types of it. [04]
OR
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Q.5 (a) Explain the steps of designing knuckle joint. Draw various resisting area during design steps. [07]
(b) What is thin cylinder? Mention its typical uses in engineering field. [03]
(c) Why Rankine’s formula is adopted for all kind of columns? [04]
OR
Explain the design procedure for designing the lever of a lever loaded safety valve. [07]
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Date: 21/05/2019
Total Marks: 70
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