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 | December, 2016 | |
| City, State | new delhi, |
Question Paper
1. Select the most suitable answer.
The cylinders in I.C. engines are usually made of
cast iron or cast steel
aluminium
stainless steel
copper
The length of the piston in an I.C. engine varies between
2·5 D and 3 D
2D and2·5D
1·5 D and 2D
D and 1·5 D
The helix angle for single helical gears ranges from
10° to 15°
15° to 20°
20° to 35°
35° to 50°
If Z Absolute viscosity of the lubricant in N Speed of the journal in rpm, and p Bearing pressure in then the bearing characteristic number is
Zp/N
ZN/p
Z/pN
pN/Z
When the length of the journal is equal to the diameter of the journal, the bearing is said to be a
short bearing
long bearing
medium bearing
square bearing
The size of a gear is usually specified by
pressure angle
pitch circle diameter
circular pitch
diametral pitch
In worm gears, the angle between the tangent to the thread helix on the pitch cylinder and the plane normal to the axis of worm is called
lead angle
pressure angle
helix angle
friction angle
2. A full journal bearing of 50 mm diameter and 100 mm length has a bearing pressure of 1·4 N/mm^2. The speed of the journal is 900 rpm and the ratio of journal diameter to the diametral clearance is 1000. The bearing is lubricated with oil whose viscosity at the operating temperature of 75°C may be taken as 0·011 kg/m-s. The room temperature is 35°C. Find
the amount of artificial cooling required
the mass of the lubricating oil required, if the difference between the outlet and inlet temperature of the oil is 10°C. Take specific heat of the oil as 1850 J/kg/°C.
3. The following particulars of a single reduction spur gear are given: Gear ratio 10 Distance between centres 660 mm approximately Pinion transmits 500 kW at 1800 rpm. Involute teeth of standard proportions (addendum with pressure angle of 22·5°,Permissible normal pressure between teeth 175 N per mm of width. Find
the nearest standard module if no interference is to occur,
the number of teeth on each wheel,
the necessary width of the pinion, and
the load on the bearings of the wheels due to power transmitted.
4. Determine a suitable ball bearing to carry a radial load of 10000 N and an axial load of 4000 N. The shaft rotates at 1000 rpm. Average life is 5000 hours. Assume mild shock for the above purpose.
5. Design a worm gearing to transmit 20 HP from an electric motor which is running at 1500 rpm and attached to another machine running at 75 rpm. Take the load as intermittent 3 hours of continuous service) and steady. (Use mechanical design data book)
6. Design a connecting rod for a four-stroke petrol engine with the given data:
Piston diameter 0·10 m
Stroke 0·14 m
Length of the connecting rod (centre to centre) =0·315 m
Weight of reciprocating parts =18·2N Speed =1500 rev/min with possible over speed of 2500
Compression ratio =4·0 Probable maximum explosion pressure 2·45 MPa
Discuss the tapered shape factor of the skirt for pistons in an I.C. engine.
Explain the various types of stresses introduced in crank-web.
The cylinders in I.C. engines are usually made of
cast iron or cast steel
aluminium
stainless steel
copper
The length of the piston in an I.C. engine varies between
2·5 D and 3 D
2D and2·5D
1·5 D and 2D
D and 1·5 D
The helix angle for single helical gears ranges from
10° to 15°
15° to 20°
20° to 35°
35° to 50°
If Z Absolute viscosity of the lubricant in N Speed of the journal in rpm, and p Bearing pressure in then the bearing characteristic number is
Zp/N
ZN/p
Z/pN
pN/Z
When the length of the journal is equal to the diameter of the journal, the bearing is said to be a
short bearing
long bearing
medium bearing
square bearing
The size of a gear is usually specified by
pressure angle
pitch circle diameter
circular pitch
diametral pitch
In worm gears, the angle between the tangent to the thread helix on the pitch cylinder and the plane normal to the axis of worm is called
lead angle
pressure angle
helix angle
friction angle
2. A full journal bearing of 50 mm diameter and 100 mm length has a bearing pressure of 1·4 N/mm^2. The speed of the journal is 900 rpm and the ratio of journal diameter to the diametral clearance is 1000. The bearing is lubricated with oil whose viscosity at the operating temperature of 75°C may be taken as 0·011 kg/m-s. The room temperature is 35°C. Find
the amount of artificial cooling required
the mass of the lubricating oil required, if the difference between the outlet and inlet temperature of the oil is 10°C. Take specific heat of the oil as 1850 J/kg/°C.
3. The following particulars of a single reduction spur gear are given: Gear ratio 10 Distance between centres 660 mm approximately Pinion transmits 500 kW at 1800 rpm. Involute teeth of standard proportions (addendum with pressure angle of 22·5°,Permissible normal pressure between teeth 175 N per mm of width. Find
the nearest standard module if no interference is to occur,
the number of teeth on each wheel,
the necessary width of the pinion, and
the load on the bearings of the wheels due to power transmitted.
4. Determine a suitable ball bearing to carry a radial load of 10000 N and an axial load of 4000 N. The shaft rotates at 1000 rpm. Average life is 5000 hours. Assume mild shock for the above purpose.
5. Design a worm gearing to transmit 20 HP from an electric motor which is running at 1500 rpm and attached to another machine running at 75 rpm. Take the load as intermittent 3 hours of continuous service) and steady. (Use mechanical design data book)
6. Design a connecting rod for a four-stroke petrol engine with the given data:
Piston diameter 0·10 m
Stroke 0·14 m
Length of the connecting rod (centre to centre) =0·315 m
Weight of reciprocating parts =18·2N Speed =1500 rev/min with possible over speed of 2500
Compression ratio =4·0 Probable maximum explosion pressure 2·45 MPa
Discuss the tapered shape factor of the skirt for pistons in an I.C. engine.
Explain the various types of stresses introduced in crank-web.
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.