Exam Details
| Subject | Power Transmitting 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 | December, 2015 | |
| City, State | new delhi, |
Question Paper
1. Choose the best answer for the following questions:
In a rectangular key with width w and the shaft diameter the usual proportion of width w is
d/10
d/4
d/6
d/8
Oldham coupling is used to connect two shafts which are
perfectly aligned
not in exact alignment
having lateral misalignment
having axes which intersect at some angle
If T1 and T2 are tensions in tight and slack side of a belt drive, Jl is the coefficient of friction and e is the angle of lap, then
T1/T2 e
T2 =T1
Jl T1/T2
Maximum shear stress theory is used for the shafts made of
Hard material
Soft material
Brittle material
Ductile material
In order to have smooth operation, the minimum number of teeth on small sprocket, for speeds, should be
15
17
21
25
The static tooth load should be the dynamic tooth load.
less than
greater than
equal to
None of the above
The number of starts on the worm gear for a velocity ratio of40 should be
single
double
triple
quadruple
Explain different types of Sunk. keys with suitable diagrams.
Design a muff coupling used to connect two steel shafts. Shaft and key are made of steel which has allowable shear stress of 40 MPa and crushing strength of 80 MPa. Muff is made of cast-iron with permissible shear stress of 15 MPa.
Derive the condition for maximum power transmitted in a belt drive.
Give the standard procedure of designating a V belt drive.
Write the advantages and disadvantages of involute and cycloidal teeth.
A pair of straight teeth spur gears is to transmit 20 kW when the pinion rotates at 300 rpm. The velocity ratio is 3. Allowable static stress for the pinion and . gear material is 120 MPa and 100 MPa respectively. Pinion has 15 teeth and face width 14 times the module. Determine
the Module and
the Face width. Assume suitable tooth factory and velocity factor c.
Explain the desired properties and selection of gear material.
Compare the belt drives, rope drives and gear drives.
Explain the types of failures in a Bevel
Explain the advantages of Helical gears over Spur gears.
Enlist different gear manufacturing techniques. Explain anyone of them.
Explain different terminologies associated with worm gears.
8. A worm drive transmits 15 kW at 2000 rpm and runs a gear which runs at 75 rpm. Worm is triple threaded and has 65 mm pitch diameter. The worm geu has 90 teeth of 6 mm module. The tooth form is 20° full depth involute. The coefficient of friction between the mating parts is 0·10. Calculate the
Tangential force acting on the arms
Axial thrust and separating force on arms and
Efficiency of the drive.
In a rectangular key with width w and the shaft diameter the usual proportion of width w is
d/10
d/4
d/6
d/8
Oldham coupling is used to connect two shafts which are
perfectly aligned
not in exact alignment
having lateral misalignment
having axes which intersect at some angle
If T1 and T2 are tensions in tight and slack side of a belt drive, Jl is the coefficient of friction and e is the angle of lap, then
T1/T2 e
T2 =T1
Jl T1/T2
Maximum shear stress theory is used for the shafts made of
Hard material
Soft material
Brittle material
Ductile material
In order to have smooth operation, the minimum number of teeth on small sprocket, for speeds, should be
15
17
21
25
The static tooth load should be the dynamic tooth load.
less than
greater than
equal to
None of the above
The number of starts on the worm gear for a velocity ratio of40 should be
single
double
triple
quadruple
Explain different types of Sunk. keys with suitable diagrams.
Design a muff coupling used to connect two steel shafts. Shaft and key are made of steel which has allowable shear stress of 40 MPa and crushing strength of 80 MPa. Muff is made of cast-iron with permissible shear stress of 15 MPa.
Derive the condition for maximum power transmitted in a belt drive.
Give the standard procedure of designating a V belt drive.
Write the advantages and disadvantages of involute and cycloidal teeth.
A pair of straight teeth spur gears is to transmit 20 kW when the pinion rotates at 300 rpm. The velocity ratio is 3. Allowable static stress for the pinion and . gear material is 120 MPa and 100 MPa respectively. Pinion has 15 teeth and face width 14 times the module. Determine
the Module and
the Face width. Assume suitable tooth factory and velocity factor c.
Explain the desired properties and selection of gear material.
Compare the belt drives, rope drives and gear drives.
Explain the types of failures in a Bevel
Explain the advantages of Helical gears over Spur gears.
Enlist different gear manufacturing techniques. Explain anyone of them.
Explain different terminologies associated with worm gears.
8. A worm drive transmits 15 kW at 2000 rpm and runs a gear which runs at 75 rpm. Worm is triple threaded and has 65 mm pitch diameter. The worm geu has 90 teeth of 6 mm module. The tooth form is 20° full depth involute. The coefficient of friction between the mating parts is 0·10. Calculate the
Tangential force acting on the arms
Axial thrust and separating force on arms and
Efficiency of the drive.
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.