Theory of Machines MCQs Quiz Multiple Choice Questions & Answers

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

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

2. A ball and a socket forms a

1. Screw pair
2. Spherical pair
3. Turning pair
4. Rolling 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. 3
2. None of the above
3. 2
4. 4

4. A higher pair has

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

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

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

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

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

7. Hammer blow

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

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

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

9. In a hydrodynamic journal bearing, there is

1. no lubricant between the journal and the bearing
2. a forced lubricant between the journal and the bearing
3. a very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing
4. a thick film of 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. Logarithmic decrement
2. Magnification factor
3. Critical damping ratio
4. Damping factor

11. In which of the following type of gear train the first gear and the last gear are co-axial

1. Reverted gear train
2. None of the above
3. Simple gear train
4. Compound gear train

12. Length of arc of contact is given by

1. Arc of approach / Arc of recess
2. Arc of approach x Arc of recess
3. Arc of approach - Arc of recess
4. Arc of approach + Arc of recess

13. Minimum number of teeth for involute rack and pinion arrangement for pressure angle of 20 degree is

1. 30
2. 34
3. 18
4. 20

14. Module of a gear is

1. 2D/T
2. 2T/D
3. D/T
4. T/D

15. Oldhams coupling is an inversion of the kinematic chain used in

1. Rotary engine
2. Universal joint
3. Whitworth quick return mechanism
4. Elliptical trammel

16. The balancing weights are introduced in planes parallel to the plane of rotation of the disturbing mass. To obtain complete dynamic balance, the minimum number of balancing weights to be introduced in different planes is

1. 3
2. 4
3. 1
4. 2

17. The Kutzbach criterion for determining the number of degrees of freedom (n) is (where l = number of links, j = number of joints and h = number of higher pairs)

1. n = 3(l-1)-3j-h
2. n = 2(l-1)-3j-h
3. n = 3(l-1)-2j-h
4. n = 2(l-1)-2j-h

18. The method of direct and reverse cranks is used in engines for

1. kinematic analysis
2. vibration analysis
3. the control of speed fluctuations
4. balancing of forces and couples

19. The type of gears used to connect two non parallel and non intersecting shafts is

1. Bevel gear
2. Spiral gear
3. Spur gear
4. Helical gear

20. To connect two parallel and coplanar shafts the following type of gearing is used

1. Spiral gear
2. None of the above
3. Spur gear
4. Bevel gear

21. Transmission angle is the angle between

1. Output link and coupler
2. Output link and fixed link
3. Input link and coupler
4. Input link and fixed link

22. What is the number of instantaneous centres for an eight link mechanism?

1. 30
2. 8
3. 15
4. 28

23. Which gear is used for connecting two coplanar and intersecting shafts?

1. Bevel gear
2. None of the above
3. Spur gear
4. Helical gear

24. Which gear train is used for higher velocity ratios in a small space?

1. Reverted gear train
2. Epicyclic gear train
3. Simple gear train
4. Compound gear train

25. Which of the following is a higher pair?

1. Belt and pulley
2. None of the above
3. Turning pair
4. Screw pair

26. Which of the following is an inversion of Single slider crank chain?

1. Oldhams coupling
2. Elliptical trammel
3. Beam engine
4. Rotary engine

27. Which of the following is an open pair?

1. Leave screw and nut
2. None of the above
3. Journal bearing
4. Ball and Socket joint

28. Which one of the following is an exact straight line mechanism using lower pairs?

1. Roberts mechanism
2. Paucelliers mechanism
3. Watts mechanism
4. Grasshopper mechanism

29. Which type of gear train is used in clock mechanism to join hour hand and minute hand?

1. Reverted gear train
2. Epicyclic gear train
3. Simple gear train
4. Compound gear train

30. Which type of gearing is used in steering system of an automobile?

1. Spiral gears
2. None of the above
3. Rack and pinion
4. Worm and wheel

31. Whirling speed of the shaft is the speed at which

1. shaft tends to vibrate vigorously in transverse direction
2. combination of transverse and longitudinal vibration occurs
3. Shaft tends to vibrate in longitudinal direction
4. torsional vibrations occur