Exam Details
| Subject | Machine Design-Ii | |
| 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, 2016 | |
| City, State | new delhi, |
Question Paper
1. Select the most appropriate alternative as an answer:
In thrust bearing, the load acts
along the axis of rotation
perpendicular to the axis of rotation
30° to the axis of rotation
None of the above
In a full journal bearing, the angle of contact of the bearing with the journal is
120°
180°
270°
(iv)360°
The length of the cylinder in I.C. engines 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
The number of starts on the worm for a velocity ratio of 40 should be
single
double
triple
quadruple
The helix angle for double helical gears may be made up to
45°
60°
75°
90°
The rolling contact bearings are known as
thick lubricated bearings
plastic bearings
thin lubricated bearings
anti-friction bearings
The backlash for spur gears depends upon
module
pitch line velocity
tooth profile
both and
2. A motor shaft rotating at 1500 rpm has to transmit 15 kW to a low speed shaft with a speed reduction of 3:1. The teeth are 14 1/2 involute with 25 teeth on the pinion. Both the pinion and gear are made of steel with a maximum safe stress of 200 MPa. A safe stress of 40 MPa may be taken for the shaft on which the gear is mounted and for the key. Design a spur gear drive to suit the above conditions. Also sketch the spur gear drive. Assume starting torque to be 25% higher than the running torque.
3. Design a journal bearing for a centrifugal pump from the following data:
Load on the journal 20,000N;
Speed of the journal 900 rpm;
Type of oil is SAE 10, for which the absolute
viscosity at 55°C =0·017
Ambient temperature of oil =15.5°C;
Maximum pressure for the pump =1.5 N/mm^2.
Determine the mass. of lubricating oil required for
artificial cooling, if rise of temperature of oil be limited to 10°C.
Heat dissipation coefficient =1232
4. A pair of helical gears have to transmit 12 kW. The teeth are 20° stub in diametral plane and have a helix angle of 45°. The number of teeth on pinion is 20, and runs at 10,000 rpm. The teeth on gear is 80. If the gears are made of cast steel having static strength of 100 MPa, determine the required face width.
5. Determine the dynamic load carrying capacity of a deep-groove ball bearing with the least bore size, and which is required to resist a radial load of 4 kN and an axial load of 3 kN. The shaft rotates at 14,000 rpm. The bearing is required to be in operation for 12,000 hours. 14
6. A 4-stroke diesel engine has the following specifications
Brake power 6 kW; Speed 1200 rpm;Indicated mean effective pressure =0.35 N/mm^2 Mechanical efficiency
Determine:
Bore and length of the cylinder;
Thickness of the cylinder head; and
Size of studs for cylinder head.
State the two most important reasons for adopting involute curves for a gear tooth profile.
Discuss the design of connecting rod for a 4-stroke petrol engine.
In thrust bearing, the load acts
along the axis of rotation
perpendicular to the axis of rotation
30° to the axis of rotation
None of the above
In a full journal bearing, the angle of contact of the bearing with the journal is
120°
180°
270°
(iv)360°
The length of the cylinder in I.C. engines 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
The number of starts on the worm for a velocity ratio of 40 should be
single
double
triple
quadruple
The helix angle for double helical gears may be made up to
45°
60°
75°
90°
The rolling contact bearings are known as
thick lubricated bearings
plastic bearings
thin lubricated bearings
anti-friction bearings
The backlash for spur gears depends upon
module
pitch line velocity
tooth profile
both and
2. A motor shaft rotating at 1500 rpm has to transmit 15 kW to a low speed shaft with a speed reduction of 3:1. The teeth are 14 1/2 involute with 25 teeth on the pinion. Both the pinion and gear are made of steel with a maximum safe stress of 200 MPa. A safe stress of 40 MPa may be taken for the shaft on which the gear is mounted and for the key. Design a spur gear drive to suit the above conditions. Also sketch the spur gear drive. Assume starting torque to be 25% higher than the running torque.
3. Design a journal bearing for a centrifugal pump from the following data:
Load on the journal 20,000N;
Speed of the journal 900 rpm;
Type of oil is SAE 10, for which the absolute
viscosity at 55°C =0·017
Ambient temperature of oil =15.5°C;
Maximum pressure for the pump =1.5 N/mm^2.
Determine the mass. of lubricating oil required for
artificial cooling, if rise of temperature of oil be limited to 10°C.
Heat dissipation coefficient =1232
4. A pair of helical gears have to transmit 12 kW. The teeth are 20° stub in diametral plane and have a helix angle of 45°. The number of teeth on pinion is 20, and runs at 10,000 rpm. The teeth on gear is 80. If the gears are made of cast steel having static strength of 100 MPa, determine the required face width.
5. Determine the dynamic load carrying capacity of a deep-groove ball bearing with the least bore size, and which is required to resist a radial load of 4 kN and an axial load of 3 kN. The shaft rotates at 14,000 rpm. The bearing is required to be in operation for 12,000 hours. 14
6. A 4-stroke diesel engine has the following specifications
Brake power 6 kW; Speed 1200 rpm;Indicated mean effective pressure =0.35 N/mm^2 Mechanical efficiency
Determine:
Bore and length of the cylinder;
Thickness of the cylinder head; and
Size of studs for cylinder head.
State the two most important reasons for adopting involute curves for a gear tooth profile.
Discuss the design of connecting rod for a 4-stroke petrol engine.
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.