## Theory of Machines Quiz Question with Answer

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

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

12. Length of arc of contact is given by

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

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

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

14. Module of a gear is

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

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

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

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. 1
2. 2
3. 3
4. 4

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

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

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

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

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

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

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