CIRCULAR PITCH BE INCREASED WHICH OF THESE ARE EFFECTIVE IN AVOIDIN...

5. Circular pitch be increased

Which of these are effective in avoiding interference?

(a) 1, 2 and 3

(b) 2, 3, 4 and 5

(c) 1, 4 and 5

(d) 3, 4 and 5

IES-21Ans. (b)

IES-22. An external gear with 60 teeth meshes with a pinion of 20 teeth, module

being 6 mm. What is the centre distance in mm?

[IES-2009]

(a) 120 (b) 180

(c) 240 (d) 300

IES-22Ans. (c)

Centre distance in mm

m

T

T

(

)

=

+

1

2

2

6

60 20

=

240 mm

IES-23. Assertion

(A): An involute rack with 20° pressure angle meshes with a pinion of