Machine Design

11. A tapered key which fits in a keyway in the hub and is flat on the shaft, is known as

1. wood-ruff key
2. feather key
3. flat saddle key
4. gib head key
5. hollow saddle key.

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12. Aircraft body is usually fabricated by

1. welding
2. precasting
3. rivetting
4. casting
5. unconventional methods.

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13. Allen bolts are

1. self locking bolts
2. designed for shock load
3. used in aircraft application
4. provided with hexagonal depression in head
5. uniform strength bolts.

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14. An alien bolt is

1. self locking bolt
2. same as stud
3. provided with hexagonal depression in head
4. used in high speed components
5. provided with countersunk head.

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15. Antifriction bearings are

1. sleeve bearings
2. hydrodynamic bearings
3. thin lubricated bearings
4. ball and roller bearings
5. none of the above.

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16. Applications in which stresses are encountered in one direction only uses following type of threads

1. metric
2. buttress
3. acme
4. square
5. BSW.

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17. At low temperatures (say 75°C) the notched-bar impact value of steel

1. increases markedly
2. decreases markedly
3. remains same
4. depends on heat treatment carried out
5. none of the above.

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18. Ball bearing type screws are found in following application

1. screw jack
2. aeroplane engines
3. crane
4. steering mechanism
5. bench vice.

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19. Basic hole is one

1. whose upper deviation is zero
2. whose lower deviation is zero
3. whose lower as well as upper deviations are zero
4. does not exist
5. none of the above.

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20. Basic shaft is one

1. whose upper deviation is zero
2. whose lower deviation is zero
3. whose lower as well as upper deviations are zero
4. does not exist
5. none of the above.

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