Mechanical Engineering Objective Questions { Machine Design }

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239. Friction radius for new clutches compared to om-out will be

D. Depends on overall size of clutch

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240. The percentage of total brake effort that results from self energizing action depends on

A. The location of the brake arm pivot point

B. The coefficient of friction

C. The direction of rotation of the brake drum

D. All of the above

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241. In order to prevent the brake arm from grabbing, the moment of friction force about the brake arm pivot point should be

A. Less than the total required braking effort

B. Greater than the total required braking effort

C. Equal to the total required braking effort

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242. In an involute gear, the base circle must be

A. At root circle

B. Under root circle

C. Above root circle

D. Under pitch circle

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243. The part of the tooth between the pitch circle and dedendum circle is called

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244. Backlash is spur gears is the

A. Difference between the dedendum of one gear and the addendum of the mating gear

B. Difference between the tooth space of one gear and the tooth thickness of the mating gear measured on the pitch circle

C. Intentional extension of centre distance between two gears

D. Does not exist

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245. In/which type of teeth, variation in centre distance within limits does not affect the velocity ratio of the mating gears

D. All Of the above

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