Exam Details
| Subject | Design of Machine Elements | |
| Paper | ||
| Exam / Course | Diploma in Mechanical Engineering (DMEVI)& B.Tech. MECHANICAL ENGINEERING 1-4 (BTMEVI) | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | June, 2015 | |
| City, State | new delhi, |
Question Paper
1. Select the most appropriate alternative:
In a unilateral system of tolerance, the tolerance is allowed on
one side of the actual size
one side of the nominal size
both sides of the actual size
both sides of the nominal size
The ratio of the ultimate stress to the design stress is known as
elastic limit
strain
factor of safety
bulk modulus
The neutral axis of a beam is subjected to
zero stress
maximum tensile stress
maximum compressive stress
maximum shear stress
The length of the cylinder in i.e. Engine is usually taken as
equal to the length of piston
equal to the length of stroke
equal to the cylinder bore
1·5 times the length of stroke
A spring used to absorb shocks and vibration is
closely-coiled helical spring
open-coiled helical spring
conical spring
leaf spring
Which of the following screw threads is adopted for power transmission in either direction?
Acme threads
Square threads
Buttress threads
Multiple threads
A connecting rod is designed as a
long-column
short-column
strut
None of these
2. A bar of circular cross-section is subjected to alternating tensile forces varying from a minimum of 200 kN to a maximum of 500 kN. It is to be manufactured of a material with an ultimate tensile strength of 900 MPa and an endurance limit of 700 MPa. Determine the diameter of the bar using safety factors of 3·5 related to ultimate tensile strength and 4 related to endurance limit and a concentration factor of 1·65 for fatigue load. Use Goodman straight line as the basis for design.
3. A solid circular shaft is subjected to a bending moment of 3000 N-m and a torque of 10,000 N-m. The shaft is made of 45C8 steel having ultimate tensile stress of 700 MPa and an ultimate shear stress of 500 MPa. Assuming a factor of safety as determine the diameter of the shaft.
4. Design the rectangular key for a shaft of 50 mm diameter. The shearing and crushing stresses for the key material are 42 MPa and 70 MPa.
5. Design a spring for a balance to measure 0 to 1000 N over a scale of length 80 cm. The spring is to be enclosed in a casing of 25 mm diameter. The approximate number of turns is 30. The modulus of rigidity is 85 kN/mm^2. Also calculate the maximum shear stress induced.
6. State the assumptions used in Euler's column theory. Compare the ratio of strength of a solid column to that of a hollow column of internal diameter equal to 3/4th of its external diameter. Both the columns have the same cross-sectional areas, lengths and end conditions.
7. Discuss the function of coupling. Describe with the help of neat sketches, the types of various shaft couplings, mentioning the uses of each type.
8. What is the function of a connecting rod of an internal combustion engine Explain the various stresses induced in the connecting rod.
In a unilateral system of tolerance, the tolerance is allowed on
one side of the actual size
one side of the nominal size
both sides of the actual size
both sides of the nominal size
The ratio of the ultimate stress to the design stress is known as
elastic limit
strain
factor of safety
bulk modulus
The neutral axis of a beam is subjected to
zero stress
maximum tensile stress
maximum compressive stress
maximum shear stress
The length of the cylinder in i.e. Engine is usually taken as
equal to the length of piston
equal to the length of stroke
equal to the cylinder bore
1·5 times the length of stroke
A spring used to absorb shocks and vibration is
closely-coiled helical spring
open-coiled helical spring
conical spring
leaf spring
Which of the following screw threads is adopted for power transmission in either direction?
Acme threads
Square threads
Buttress threads
Multiple threads
A connecting rod is designed as a
long-column
short-column
strut
None of these
2. A bar of circular cross-section is subjected to alternating tensile forces varying from a minimum of 200 kN to a maximum of 500 kN. It is to be manufactured of a material with an ultimate tensile strength of 900 MPa and an endurance limit of 700 MPa. Determine the diameter of the bar using safety factors of 3·5 related to ultimate tensile strength and 4 related to endurance limit and a concentration factor of 1·65 for fatigue load. Use Goodman straight line as the basis for design.
3. A solid circular shaft is subjected to a bending moment of 3000 N-m and a torque of 10,000 N-m. The shaft is made of 45C8 steel having ultimate tensile stress of 700 MPa and an ultimate shear stress of 500 MPa. Assuming a factor of safety as determine the diameter of the shaft.
4. Design the rectangular key for a shaft of 50 mm diameter. The shearing and crushing stresses for the key material are 42 MPa and 70 MPa.
5. Design a spring for a balance to measure 0 to 1000 N over a scale of length 80 cm. The spring is to be enclosed in a casing of 25 mm diameter. The approximate number of turns is 30. The modulus of rigidity is 85 kN/mm^2. Also calculate the maximum shear stress induced.
6. State the assumptions used in Euler's column theory. Compare the ratio of strength of a solid column to that of a hollow column of internal diameter equal to 3/4th of its external diameter. Both the columns have the same cross-sectional areas, lengths and end conditions.
7. Discuss the function of coupling. Describe with the help of neat sketches, the types of various shaft couplings, mentioning the uses of each type.
8. What is the function of a connecting rod of an internal combustion engine Explain the various stresses induced in the connecting rod.
Other Question Papers
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Subjects
- Advanced Dynamics Of Machine
- Automobile Engineering
- Combustion Engineering
- Computer Aided Manufacturing
- Computing Aided Design
- Design of Machine Elements
- Engineering Metallurgy
- Engineering Thermodynamics
- Experimental Stress Analysis
- Finite Element Analysis
- Fluid Mechanics
- Heat And Mass Transfer
- Heat Transfer
- I.C. Engines
- Industrial Engineering
- Industrial Ergonomics
- Industrial Measurement And Quality Control
- Industrial Organization And Management
- Kinematics and Dynamics of Machines
- Machine Design - I
- Machine Design-Ii
- Machine Drawing
- Machines Tools
- Maintenance Engineering
- Material Science
- Materials Handling
- Mechanical System Design
- Mechanical Vibration
- Mechanics Of Materials
- Mechatronics
- Metrology
- Metrology And Quality Control
- Non-Conventional Energy Resources
- Non-Destructive Testing
- Nuclear Power Engineering
- Optimisation Techniques In Engineering
- Optimization For Engineering Design
- Power Plant Engineering
- Power Transmitting Elements
- Product Development And Design
- Production And Operations Management
- Production Technology - Ii
- Production Technology-I
- Refrigeration And Air Conditioning
- Refrigeration System
- Robotics
- Safety Engineering
- Technical Entrepreneurship
- Thermal Engineering
- Thermal Engineering - I
- Thermofluid Engineering
- Total Quality Management (Tqm)
- Tribology
- Turbo Machines
- Unconventional Manufacturing Processes
- Welding Engg.