Exam Details
| Subject | Theory of Machine | |
| Paper | ||
| Exam / Course | Diploma in Mechanical Engineering | |
| 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 suitable answer from the given four alternatives.
For a cricket ball, when it is in air, the degrees of freedom for this ball are equal to
two
four
six
eight
A sliding body on a plane surface has degree(s) of freedom.
one
two
three
four
A cylinder rolling on a flat surface has a ____contact.
Point
Line
Both and
None of the above
Quick Return Ratio
21t-e/e
e/21t-e
(21t
None of the above
Angle of friction is
l/l Jl
l/l =tan-1 Jl
l/l Jl
l/l =cot-1 Jl
Ratio of tension in flat belt is
T1 xT2 =e^J.L8
(T1 eJ.L8
(T2 eJ.L8
T1/T2 efJ9
Gear Ratio in simple gear train is
N1/N4 =t4/t1
N4/N1 =t4/t1
N1xN4 t4/t1
All of the above
Describe any three types of kinematic pairs giving examples for each one of them.
What is a machine? What is the difference between machine and mechanism?
What is a clutch What are the different types of clutches? Explain in detail about anyone type of clutch.
What is a bearing? What are the different types of bearings? Explain in detail about anyone type of bearing.
4. In a flat belt drive the initial tension is 2000 N. The coefficient of friction between the belt and pulley is 0·3 and the angle of lap on the smaller pulley is 1500 The smaller pulley has a radius of 200 mm and rotates at 500 r.p.m. Find the power in kW transmitted by the belt.
5. Derive an expression for the length of a belt in an open belt drive.
6. The arms of a Porter governor are 25 cm long and pivoted on the governor axis. The mass of each ball is 5 kg and the mass on central load of the sleeve is 30 kg. The radius of rotation of balls is 15 cm when the sleeve begins to rise and reaches a value of 20 cm for maximum speed. Determine the speed range.
7. A shaft of length 0·75 supported freely at the ends, is carrying a body of mass 90 kg at 0·25 m from one end. Find the natural frequency of transverse vibration. Assume E 200 GN/m^2 and shank diameter 50 mm.
For a cricket ball, when it is in air, the degrees of freedom for this ball are equal to
two
four
six
eight
A sliding body on a plane surface has degree(s) of freedom.
one
two
three
four
A cylinder rolling on a flat surface has a ____contact.
Point
Line
Both and
None of the above
Quick Return Ratio
21t-e/e
e/21t-e
(21t
None of the above
Angle of friction is
l/l Jl
l/l =tan-1 Jl
l/l Jl
l/l =cot-1 Jl
Ratio of tension in flat belt is
T1 xT2 =e^J.L8
(T1 eJ.L8
(T2 eJ.L8
T1/T2 efJ9
Gear Ratio in simple gear train is
N1/N4 =t4/t1
N4/N1 =t4/t1
N1xN4 t4/t1
All of the above
Describe any three types of kinematic pairs giving examples for each one of them.
What is a machine? What is the difference between machine and mechanism?
What is a clutch What are the different types of clutches? Explain in detail about anyone type of clutch.
What is a bearing? What are the different types of bearings? Explain in detail about anyone type of bearing.
4. In a flat belt drive the initial tension is 2000 N. The coefficient of friction between the belt and pulley is 0·3 and the angle of lap on the smaller pulley is 1500 The smaller pulley has a radius of 200 mm and rotates at 500 r.p.m. Find the power in kW transmitted by the belt.
5. Derive an expression for the length of a belt in an open belt drive.
6. The arms of a Porter governor are 25 cm long and pivoted on the governor axis. The mass of each ball is 5 kg and the mass on central load of the sleeve is 30 kg. The radius of rotation of balls is 15 cm when the sleeve begins to rise and reaches a value of 20 cm for maximum speed. Determine the speed range.
7. A shaft of length 0·75 supported freely at the ends, is carrying a body of mass 90 kg at 0·25 m from one end. Find the natural frequency of transverse vibration. Assume E 200 GN/m^2 and shank diameter 50 mm.
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Subjects
- Applied Thermal Engineering
- Automobile Engineering
- Basics of Thermal Energy
- CAD / CAM
- CNC Machanics
- Computer Integrated Manufacturing
- Engineering Materials
- Machine Design
- Manufacturing Processes-I
- Manufacturing Processes-II
- Manufacturing Processes-III
- Metrology and Instrumentation
- Power Plant Engineering
- Theory of Machine