431. In cyclic loading, stress concentration is more serious in
brittle materials
ductile materials
brittle as well as ductile materials
elastic materials
✅ The correct answer is option B.
Machine Design MCQs
432. According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the rivet hole (d) is obtained by
equating tearing resistance of the plate to the shearing resistance of the rivets
equating tearing resistance of the plate to the crushing resistance of the rivets
equating shearing resistance to the crushing resistance of the rivets
none of the above
✅ The correct answer is option C.
433. When the speed of belt increases,
the coefficient of friction between the belt and pulley increases
the coefficient of friction between the belt and pulley decreases
the power transmitted will decrease
the power transmitted
✅ The correct answer is option C.
434. When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where d = Nominal diameter of bolt)
0.5 d
0.75 d
d
1.25 d
✅ The correct answer is option C.
435. The property of a bearing material which has the ability to accomodate small particles of dust, grit etc. without scoring the material of the journal, is called
bondability
embeddability
comformability
fatigue strength
✅ The correct answer is option B.
436. The algebraic difference between the actual size and the corresponding basic size is called actual deviation.
Agree
Disagree
✅ The correct answer is option A.
437. According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by
equating tearing resistance of the plate to the shearing resistance of the rivets
equating tearing resistance of the plate to the crushing resistance of the rivets
equating shearing resistance to the crushing resistance of the rivets
none of the above
✅ The correct answer is option D.
438. The machine screws are
slotted for a screw driver and are generally used with a nut
similar to tap bolts except that they are of small size and a variety of shapes of heads are available
used to prevent relative motion between the two parts
none of the above
✅ The correct answer is option A.
439. The static tooth load should be __________ the dynamic load.
equal to
less than
greater than
✅ The correct answer is option C.
440. Failure of a material is called fatigue when it fails
at the elastic limit
below the elastic limit
at the yield point
below the yield point
✅ The correct answer is option D.