Machine Design

1. A backing ring is used inside the pipe joint when making a

1. butt weld
2. fillet weld
3. sleeve weld
4. socket weld
5. tube weld.

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2. A bench vice has following type of threads

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

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3. A bolt

1. has a head on one end and a nut fitted to the other
2. has head at one end and other end fits into a tapped hole in the other part to be joined
3. has both the ends threaded
4. is provided with pointed threads
5. requires no nut.

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4. A hot short metal is

1. brittle when cold
2. brittle when hot
3. brittle under all conditions
4. ductile at high temperature
5. hard when hot.

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5. A key capable of tilting in a recess milled out in a 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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6. A key made from a cylindrical disc having segmental cross-section, 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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7. A self locking screw has

1. fine threads
2. coarse threads
3. coefficient of friction > tangent of load angle
4. hole for inserting split pin
5. two nuts for locking.

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8. A stud

1. has a head on one end and a nut fitted to the other
2. has head at one end and other end fits into a tapped hole in the other part to be joined
3. has both the ends threaded
4. has pointed threads
5. requires locking nuts.

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9. A tap bolt

1. has a head on one end and a nut fitted to the other
2. has head at one end and other end fits into a tapped hole in the other part o be joined
3. has both the ends threaded
4. has pointed threads
5. requires locking devices.

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10. 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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