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Elements of Design 5th Sem/9326/May 2016 Automobile Diploma Paper

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Elements of Desgin 5th Sem May 2016 Automobile Diploma Paper

                               SECTION-A

Q1.Fill in the Blanks:- 1.5×10=15
a. The design in which the designer makes minor changes and modification in existing design is called _____________ .
b. Elasticity is opposite to ____________ .
c. A slot cut in the shaft as well as in the hub to accommodate the key is called ___________.
d. The material of hub in flange coupling is ______________.
e. The coefficient of friction of the material used for lining of friction surfaces of a clutch should be ________ .
f. The S.I unit of mass moment of inertia is ____________ .
g. For a solid disc flywheel, the radius of gyration is ____________ .
h. The cross section of the arms of the pulley is______________ .
i. The part of tooth between pitch circle and addendum circle is called _________ .
j. The taper pin in knuckle joint will not allow the ___________to come out.

              SECTION-B

Q2. Attempt any five questions.                                                                    5×6=30

i. Write a short note on Ergonomics.
ii. Discuss possible failure of riveted joints under different stresses.
iii. Define the term: Standardization and Interchangeability.
iv. Discuss various advantages and disadvantages of key joints over splined joints.
v. What is flywheel? Explain the function of flywheel and state its applications.
vi. What is caulking and fullering process? Explain with help of diagram.
vii. What is design? What is the necessity of design?
viii. What should be the length of the key 30mm wide you would use with a gearing drive 150mm diameter designed to operate at a torsional working stress of 120MN/m2?
SECTION – C

     SECTION-C

Q3. Attempt any three questions.                                                       3×10=30

Q3. The internal diameter of a hollow shaft is 3/5 of its external diameter. Compare its resistance to torsion with that of a solid shaft of the same weight, material and stresses induced.

Q4. A single plate clutch effective on both sides transmits 25kW at 300 RPM. Determine the external and internal radii of frictional surfaces if the ratio of radii is 1.25, coefficient of friction is 0.25 and the maximum pressure does not exceed 0.1N/mm2. Also determine axial thrust to be provided by springs. Assume uniform wear.

Q5. The turning moment diagram for a reciprocating engine is drawn to the following scales: Turning moment, 1mm=1000Nm, crank angle, 1mm=6ᵒ. The area above and below the mean turning moment line taken in order are: 530, 330, 380, 470, 180, 360, 350 and 280 mm2. Design a suitable cast iron flywheel for the engine. The mean speed of the engine is 150RPM and total fluctuation of speed is 4% of the mean speed. The density of cast iron is 0.0072g/mm3. Also determine the centrifugal or hoop stress produced in the rim of flywheel if the peripheral velocity of flywheel is 15m/s. Take allowable shear stress for shaft and key material as 40N/mm2.

Elements of Desgin 5th Sem May 2016 Automobile Diploma Paper

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Section a Elements of Desgin 5th Sem May 2016 Automobile Paper

The design in which the designer makes minor changes and modification in existing design is called _____________ .

The design in which the designer makes minor changes and modification in existing design is called _____________ .

Elasticity is opposite to ____________ .

Elasticity is opposite to ____________ .

A slot cut in the shaft as well as in the hub to accommodate the key is called ___________.

A slot cut in the shaft as well as in the hub to accommodate the key is called ___________.

The material of hub in flange coupling is ______________.

The material of hub in flange coupling is ______________.

The coefficient of friction of the material used for lining of friction surfaces of a clutch should be ________ .

The coefficient of friction of the material used for lining of friction surfaces of a clutch should be ________ .

The S.I unit of mass moment of inertia is ____________ .

The S.I unit of mass moment of inertia is ____________ .

For a solid disc flywheel, the radius of gyration is ____________ .

For a solid disc flywheel, the radius of gyration is ____________ .

The cross section of the arms of the pulley is______________ .

The cross section of the arms of the pulley is______________ .

The part of tooth between pitch circle and addendum circle is called _________

The part of tooth between pitch circle and addendum circle is called _________ .

The taper pin in knuckle joint will not allow the ___________to come out.

The taper pin in knuckle joint will not allow the ___________to come out.

Elements of Desgin 5th Sem May 2016 Automobile Diploma Paper  Click Here

Section B :Elements of Desgin 5th Sem May 2016 Automobile Paper

Explain the general procedure of designing of machine element.

General procedure of designing of machine element.

What are the basic requirements of machine design?

Basic requirements of machine design.

Define key. Give its various types.

Key and its various types.

Explain the design procedure of shaft when subjected to twisting moment only.

Design procedure of shaft when subjected to twisting moment only.

Write a short note on Ergonomics.

Short note on Ergonomics.

Write the advantages of coupling.

Advantages of coupling.

Write the design considerations for a gear.

Design considerations for a gear.

A line shaft rotating at 250 RPM is to transmit 25kW. The shaft is assumed to be made of mild steel with an allowable shear stress of 40MPa.

Line shaft rotating at 250 RPM is to transmit 25kW. The shaft is assumed to be made of mild steel with an allowable shear stress of 40MPa. Calculate the diameter of the shaft. Neglect bending moment of the shaft.

Elements of Desgin 5th Sem May 2016 Automobile Diploma Paper Click Here

Elements of Desgin 5th Sem May 2016 Automobile Diploma Paper

Get Started https://www.youtube.com/watch?v=UHX6f8TIvX8https://www.youtube.com/watch?v=M_RR6LVICp0https://www.youtube.com/watch?v=mV41CMWonN4https://www.youtube.com/watch?v=s0LVPE0Q3LE&list=PLA9Q9SDZ781WXNAWit379A4CRLMvjGiUw&index=14&t=0s

Section c :-Elements of Desgin 5th Sem May 2016 Diploma Paper

The internal diameter of a hollow shaft is 3/5 of its external diameter. Compare its resistance to torsion with that of a solid shaft of the same weight, material and stresses induced.

Internal diameter of a hollow shaft is 3/5 of its external diameter. Compare its resistance to torsion with that of a solid shaft of the same weight, material and stresses induced.

 

A single plate clutch effective on both sides transmits 25kW at 300 RPM. Determine the external and internal radii of frictional surfaces if the ratio of radii is 1.25, coefficient of friction is 0.25 and the maximum pressure does not exceed 0.1N/mm2.

Single plate clutch effective on both sides transmits 25kW at 300 RPM. Determine the external and internal radii of frictional surfaces if the ratio of radii is 1.25, coefficient of friction is 0.25 and the maximum pressure does not exceed 0.1N/mm2. Also determine axial thrust to be provided by springs. Assume uniform wear.

 

The turning moment diagram for a reciprocating engine is drawn to the following scales: Turning moment, 1mm=1000Nm, crank angle, 1mm=6ᵒ.

Turning moment diagram for a reciprocating engine is drawn to the following scales: Turning moment, 1mm=1000Nm, crank angle, 1mm=6ᵒ. The area above and below the mean turning moment line taken in order are: 530, 330, 380, 470, 180, 360, 350 and 280 mm2. Design a suitable cast iron flywheel for the engine. The mean speed of the engine is 150RPM and total fluctuation of speed is 4% of the mean speed. The density of cast iron is 0.0072g/mm3. Also determine the centrifugal or hoop stress produced in the rim of flywheel if the peripheral velocity of flywheel is 15m/s. Take allowable shear stress for shaft and key material as 40N/mm2.

Design a flange coupling for a mild steel shaft transmitting 90 kW at 250 rpm. Allowable shear stress for mild steel = 40 MPa, for cast iron = 14 MPa and for bolt material = 30 MPa. The materials for shaft and key are same.

Flange coupling for a mild steel shaft transmitting 90 kW at 250 rpm. Allowable shear stress for mild steel = 40 MPa, for cast iron = 14 MPa and for bolt material = 30 MPa. The materials for shaft and key are same.

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