211. Best profile to obtain resistance against wear is
A.141? rack 2
B.1410 full depth involute 2
C.141? involute stub 2
D.20? full depth involute

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212. Which is false statement about cycloidal gears
A.Interference exists
B.(a) greater than arc of recess
C.(b) equal to arc of recess
D.(c) less than arc of recess

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213. A gear having 100 teeth is fixed and another gear having 25 teeth revolves around it, the centre lines of both gears being joined by an arm. How many revolutions will be made by gear of 25 teeth for one revolution of arm
A.4
B.3
C.5
D.6

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214. The interference or undercutting in involute gears can be -avoided by
A.Varying the centre distance by changing pressure angle
B.Using modified involute or composite system
C.Increasing the addendum of small wheel and reducing it for the larger wheel
D.Any one of the above

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215. The cranks of locomotives with two cylinders, in order to facilitate starting of locomotive in any position, are invariably placed
A.In same plane
B.At 90? to each other
C.At 180? to each other
D.At 45? to each other

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216. Secondary forces in reciprocating mass on engine frame are
A.Of same frequency as of primary forces
B.Twice the frequency as of primary forces
C.Four times the frequency as of primary forces
D.Half the frequency as of primary forces

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217. In reciprocating engines, primary forces are
A.Completely balanced
B.Partially balanced
C.Can't be balanced
D.Balanced by secondary forces

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