Design of Machine Members-II

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Code No: 56019 Set No. 1JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

III B.Tech. II Sem., I Mid-Term Examinations, February 2014DESIGN OF MACHINE MEMBERS-II

Objective ExamName: ______________________________ Hall Ticket No.

Answer All Questions. All Questions Carry Equal Marks.Time: 20 Min. Marks: 10.

I Choose the correct alternative:

1. In thrust bearings, the load acts [ ]

a) Along the axis of the rotation b) Parallel to the axis of rotation

c) Perpendicular to the axis of rotation d) In any direction

2. In hydrodynamic bearings the fluid film is formed due to [ ]a) Pressure developed by pump b) Rotation of the journal

c) Friction between shaft and bearing d) Rollers in between shaft and bearing

3. The bearing characteristic number is given by, (Z is viscosity of the fluid; N

is speed of the journal; p is pressure developed) [ ]a) ZN/p b) Zp/N c) ZNp d) p/(ZN)

4. Which of the following is an antifriction bearing [ ]

a) Journal Bearing b) Pedestal bearing c) Collar Bearing d) Needle bearing

5. Cage is not required in [ ]

a) Tapered Roller Bearing b) Needle Roller Bearing

c) Spherical Roller Bearing d) Thrust Bearings

6. Life of the roller bearing is given in million number of cycles by [ ]

a) (C/P)3

b) (C/P)2

c) (C/P)10/3

d) (C/P)3/10

7. The skirt of the piston [ ]

a) Is used to withstand the pressure of the gas in the cylinderb) Acts as a bearing for the side thrust of the connecting rod

c) Is used to seal the cylinder to prevent the leakage of the gas

d) Is a disc which reciprocates in the cylinder

8. In a 4-stroke engine, the variable load in each cycle on the connecting rod

changes from [ ]

a) Compression to Tension b) zero to Tension

c) Zero to Compression d) Cannot be predicted

9. In the designation 6 X 19 for the wire rope, 6 and 19 stand for [ ]a) Diameter of wire rope and number of strands

b) Diameter of wire rope and number of wires

c) Number of wires and number of strandsd) Number of strands and number of wires

Cont.2

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Code No: 56019 :2: Set No. 1

10. Which of the following is a positive drive [ ]a) Crossed Belt Drive b) Open Belt Drive c) Chain Drive d) Rope Drive

II Fill in the blanks

11. The dynamic load carrying capacity of a bearing is defined as the radial load in radial bearings that

can be carried for minimum life of _____________ revolutions.

12. The roller bearing designated by 6015 is used for the bore diameter of ______ mm.

13. The ratio of the median life to rated life in a roller bearing is _____

14. ____________ locates the position of the minimum film thickness with respect to the direction ofload in a journal bearing.

15. The static load on the 75 mm diameter square journal bearing is 12.5 kN. The start-up bearingpressure is ______ MPa.

16. The ratio of length of stroke to cylinder bore is usually ______

17. The Cylinder thickness in an IC engine is calculated on the basis of __________

18. For maximum power transmission, the maximum permissible tension in the belt must be_________ times the tension due to centrifugal force

19. In a chain drive, the tension on the slack side is ________

20. The designation for V-belt with B-section and circumferential inner length 3251 mm is representedby ____________

-oOo-




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1. Which of the following is an antifriction bearing [ ]a) Journal Bearing b) Pedestal bearing c) Collar Bearing d) Needle bearing

2. Cage is not required in [ ]a) Tapered Roller Bearing b) Needle Roller Bearing


3. Life of the roller bearing is given in million number of cycles by [ ]

a) (C/P)3 b) (C/P)

2 c) (C/P)

10/3 d) (C/P)

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a) Is used to withstand the pressure of the gas in the cylinder

b) Acts as a bearing for the side thrust of the connecting rod

c) Is used to seal the cylinder to prevent the leakage of the gasd) Is a disc which reciprocates in the cylinder

5. In a 4-stroke engine, the variable load in each cycle on the connecting rodchanges from [ ]



6. In the designation 6 X 19 for the wire rope, 6 and 19 stand for [ ]

a) Diameter of wire rope and number of strands

b) Diameter of wire rope and number of wiresc) Number of wires and number of strands

d) Number of strands and number of wires

7. Which of the following is a positive drive [ ]

a) Crossed Belt Drive b) Open Belt Drive c) Chain Drive d) Rope Drive


a) Along the axis of the rotation b) Parallel to the axis of rotationc) Perpendicular to the axis of rotation d) In any direction

9. In hydrodynamic bearings the fluid film is formed due to [ ]

a) Pressure developed by pump b) Rotation of the journal


Cont.2




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Code No: 56019 :2: Set No. 2


is speed of the journal; p is pressure developed) [ ]

a) ZN/p b) Zp/N c) ZNp d) p/(ZN)


11. ____________ locates the position of the minimum film thickness with respect to the direction of

load in a journal bearing.

12. The static load on the 75 mm diameter square journal bearing is 12.5 kN. The start-up bearing

pressure is ______________ MPa.

13. The ratio of length of stroke to cylinder bore is usually _______________

14. The Cylinder thickness in an IC engine is calculated on the basis of _____________

15. For maximum power transmission, the maximum permissible tension in the belt must be

________________ times the tension due to centrifugal force

16. In a chain drive, the tension on the slack side is ______________

17. The designation for V-belt with B-section and circumferential inner length 3251 mm is represented

by ____________



19. The roller bearing designated by 6015 is used for the bore diameter of _____________ mm.

20. The ratio of the median life to rated life in a roller bearing is _____________

-oOo-




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1. Life of the roller bearing is given in million number of cycles by [ ]a) (C/P)

3 b) (C/P)

2 c) (C/P)

10/3 d) (C/P)

3/10

2. The skirt of the piston [ ]a) Is used to withstand the pressure of the gas in the cylinder




a) Compression to Tension b) Zero to Tension



a) Diameter of wire rope and number of strands

b) Diameter of wire rope and number of wiresc) Number of wires and number of strands


5. Which of the following is a positive drive [ ]a) Crossed Belt Drive b) Open Belt Drive c) Chain Drive d) Rope Drive


a) Along the axis of the rotation b) Parallel to the axis of rotationc) Perpendicular to the axis of rotation d) In any direction

7. In hydrodynamic bearings the fluid film is formed due to [ ]a) Pressure developed by pump b) Rotation of the journal


8. The bearing characteristic number is given by, (Z is viscosity of the fluid; Nis speed of the journal; p is pressure developed) [ ]a) ZN/p b) Zp/N c) ZNp d) p/(ZN)



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Code No: 56019 :2: Set No. 3





11. The ratio of length of stroke to cylinder bore is usually _____________



_________ times the tension due to centrifugal force

14. In a chain drive, the tension on the slack side is ______________

15. The designation for V-belt with B-section and circumferential inner length 3251 mm is represented

by ____________



17. The roller bearing designated by 6015 is used for the bore diameter of _____________ mm.

18. The ratio of the median life to rated life in a roller bearing is ___________

19. ____________ locates the position of the minimum film thickness with respect to the direction of

load in a journal bearing.


pressure is _____________ MPa.

-oOo-




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a) Diameter of wire rope and number of strandsb) Diameter of wire rope and number of wires

c) Number of wires and number of strands


3. Which of the following is a positive drive [ ]

a) Crossed Belt Drive b) Open Belt Drive c) Chain Drive d) Rope Drive


a) Along the axis of the rotation b) Parallel to the axis of rotation

c) Perpendicular to the axis of rotation d) In any direction

5. In hydrodynamic bearings the fluid film is formed due to [ ]

a) Pressure developed by pump b) Rotation of the journal



is speed of the journal; p is pressure developed) [ ]a) ZN/p b) Zp/N c) ZNp d) p/(ZN)






9. Life of the roller bearing is given in million number of cycles by [ ]a) (C/P)

3 b) (C/P)

2 c) (C/P)

10/3 d) (C/P)

3/10

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Code No: 56019 :2: Set No. 4


a) Is used to withstand the pressure of the gas in the cylinder





_________ times the tension due to centrifugal force

12. In a chain drive, the tension on the slack side is ________________

13. The designation for V-belt with B-section and circumferential inner length 3251 mm is representedby ____________



15. The roller bearing designated by 6015 is used for the bore diameter of ___________ mm.

16. The ratio of the median life to rated life in a roller bearing is ____________

17. ____________ locates the position of the minimum film thickness with respect to the direction ofload in a journal bearing.


pressure is ______________ MPa.

19. The ratio of length of stroke to cylinder bore is usually ______


-oOo-


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Design of Machine Members-II