Theory of Machines

141. Which of the following mechanism is obtained from lower pair

1. gyroscope
2. pantograph
3. valve and valve gears
4. generated straight line motions
5. all of the above.

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142. Which of the following mechanisms produces mathematically an exact straight line motion

1. Grasshopper mechanism
2. Watt mechanism
3. Peaucellier's mechanism
4. Tchabichiff mechanism
5. Ackermann mechanism.

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143. Which of the following would constitute a link

1. piston, piston rings and gudgeon pin
2. piston, and piston rod
3. piston rod and cross head
4. piston, crank pin and crank shaft
5. piston, piston-rod and cross head.

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144. Whitworth quick return mechanism is obtained by inversion of

1. slider crank mechanism
2. kinematic chain
3. five link mechanism
4. roller cam mechanism
5. none of the above.

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145. With single Hooke's joint it is possible to connect two shafts, the axes of which have an angular misalignment up to

1. 10°
2. 20°
3. 30°
4. 40°
5. 60°.

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