Mechanical Engineering Objective Questions { Machine Design }

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267. Interference is inherently absent in following type of gears

268. In hypoid gears, the axes

A. Are non-parallel and non-intersecting, and the teeth are curved

B. Are non-parallel and non-intersecting, and the teeth are straight

C. Intersect, and the teeth are curved and oblique

D. Intersect, and the teeth are curved and can be ground

269. The pressure angle in involute profile gear

A. Remains constant

B. Often changes

C. Rarely changes

D. Unpredictable

270. In helical gears, the right hand helix will mesh

A. Right hand helix

B. Left hand helix

C. Both of the above

D. Any one of the above

271. Pressure angle in worm gears is the angle between

A. Tangent to the pitch helix and the plane of rotation

B. Tangent to the pitch helix and an element of the pitch cylinder

C. Half the angle between two inclined faces in axial plane

D. All of the above

272. To keep noise minimum, following type of gear should be used

A. Involute spur

B. Cycloidal spur

273. The type of tooth profile used for gears in watches and docks is

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