Question

Pick up the correct statements from the following statements related to spur gears:

(P) Involute profiles being a conjugated profile ensures law of gearing without interference.

(Q) Change in centre distance does not influence the velocity ratio in case of meshing gears with involute profile.

(R) Pressure angle varies during meshing of teeth for cycloidal gears.

(S) Hypocycloidal region of the tooth of the pinion comes in contact with only the hypocycloidal region of mating gear tooth during meshing

• A. P & S only
• B. P & R only
• C. Q & R only
• D. Q & S only

Answer 1

The correct option is C Q & R only

• In involute profiles, interference can occur if the condition of minimum number of teeth on a gear is not followed.

• Hypocycloidal region of the tooth can come in contact with the epicycloidal region of mating gear tooth during meshing.