221. The stress in the bar when the load is applied suddenly is __________ as compared to the stress induced due to gradually applied loads.
same
double
three times
four times
✅ The correct answer is option B.
Machine Design MCQs
223. Lewis equation is applied
only to the pinion
only to the gear
to stronger of the pinion or gear
to weaker of the pinio
✅ The correct answer is option D.
224. In the assembly of pulley, key and shaft
pulley is made the weakest
key is made the weakest
key is made the stongest
all the three are desi
✅ The correct answer is option B.
225. Which of the following has threads at both ends?
Bolt
Tap bolt
Stud
none of these
✅ The correct answer is option C.
226. If P1 is the initial tension due to tightening up the bolt and P2 is the external load on the bolt, then the resultant load (P) on a bolt may be obtained by using the relation (where a = Ratio of elasticity of connected parts to the elasticity of bolt)
P = P1 + P2
P = P1 – P2
✅ The correct answer is option D.
227. In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to
reduce vibration
reduce slip
ensure uniform loading
ensure proper alignmen
✅ The correct answer is option C.
228. According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be
45 to 60%
63 to 70%
70 to 83%
80 to 90%
✅ The correct answer is option C.
229. An imaginary circle which by pure rolling action gives the same motion as the actual gear, is called
addendum circle
dedendum circle
pitch circle
clearance circle
✅ The correct answer is option C.
230. The rocker arms in internal combustion engines are of first type levers.
Correct
Incorrect
✅ The correct answer is option A.