Theory of Machines Multiple Choice Questions and Answers

1. ..............is an inversion of Double slider crank chain

1. Coupling rod of a locomotive
2. Scotch yoke mechanism
3. Hand pump
4. Reciprocating engine

2. A ball and a socket forms a

1. Turning pair
2. Rolling pair
3. Screw pair
4. Spherical pair

3. A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is

1. 2
2. 4
3. 3
4. None of the above

4. A higher pair has

1. Point contact
2. Surface contact
3. No contact
4. None of the above

5. A pulley and belt in a belt drive form a

1. cylindrical pair
2. turning pair
3. rolling pair
4. sliding pair

6. A rigid body possesses ............. degrees of freedom

1. One
2. Two
3. Four
4. Six

7. Hammer blow

1. is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses
2. is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses
3. varies as the square root of the speed
4. varies inversely with the square of the speed

8. In a ball bearing, ball and bearing forms a

1. Turning pair
2. Rolling pair
3. Screw pair
4. Spherical pair

9. In a hydrodynamic journal bearing, there is

1. a very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing
2. a thick film of lubricant between the journal and the bearing
3. no lubricant between the journal and the bearing
4. a forced lubricant between the journal and the bearing

10. In a system subjected to damped forced vibrations, the ratio of maximum displacement to the static deflection is known as

1. Critical damping ratio
2. Damping factor
3. Logarithmic decrement
4. Magnification factor