mechanical-engineering-machine-design Related Question Answers

151. In a V-belt drive, the belt makes contact at the bottom of the groove of the pulley.



152. In worm gears, the pressure angle is half the angle between two inclined faces in axial plane.



153. For crank shaft bearings, the ratio of the length of the journal to its diameter is less than unity.



154. Lewis equation in gears is used to find the





155. In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that





156. All stresses produced in a belt are





157. An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by





158. The ratio of driving tensions in V-belt drives is __________ flat belt drives.





159. A shaft is designed on the basis of rigidity and stiffness.



160. Which of the following spring is used in mechanical wrist watch?





161. In helical bevel gearing, the axes of shafts are __________ and the teeth are curved.



162. Which of the following has threads at both ends?





163. The ratio of the ultimate stress to the design stress is known as





164. According to Indian standards, the diameter of rivet hole is made larger than the basic size of rivet by





165. The cam follower extensively used in air-craft engines is





166. The minor diameter of a screw thread is also known as outside or nominal diameter.



167. A pressure vessel is said to be a thick shell, if the ratio of wall thickness to its diameter is





168. The radial stress across the thickness of a thick cylinder is maximum at the inner surface and zero at the outer surface.



169. The diameter of the rivet hole is usually __________ the nominal diameter of the rivet.




170. The resilience of a bolt may be increased by





171. In worm, gears, pitch lead angle is





172. The effective stress in wire ropes during normal working is equal to the stress due to





173. When the length of the journal is equal to the diameter of the journal, then the bearing is said to be a





174. A connecting rod should be





175. According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be





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