401. In a flange coupling, the keys are staggered at __________ along the circumference of the shafts in order to divide the weakening effect caused by key ways.
90°
135°
160°
180°
✅ The correct answer is option A.
Machine Design MCQs
402. Which of the following property is essential for spring materials?
Stiffness
Ductility
Resilience
Plasticity
✅ The correct answer is option C.
403. The resilience of a bolt may be increased by
increasing its shank diameter
increasing its length
decreasing its shank diameter
decreasing its length
✅ The correct answer is option B.
405. The ball bearings are, usually, made from
low carbon steel
high carbon steel
medium carbon steel
high speed steel
✅ The correct answer is option C.
406. The shock absorbing capacity of a bolt may be increased by
increasing its shank diameter
decreasing its shank diameter
tightening the bolt properly
making the shank diame
✅ The correct answer is option B.
407. In a marine flange coupling, the thickness of flange is taken as
d/4
d/3
d/2
3 d/4
✅ The correct answer is option B.
408. The face of the tooth is the
surface of the top of the tooth
surface of the tooth above the pitch surface
surface of the tooth below the pitch surface
width of the tooth mea
✅ The correct answer is option B.
409. Which of the following screw thread is used for power transmission in one direction only.
Acme threads
Square threads
Buttress threads
Multiple threads
✅ The correct answer is option C.
410. Which of the following statement is correct regarding power screws?
The efficiency of a self locking screw can not be more than 50%
The efficiency of Acme (trapezoidal) thread is less than that of a square thread
If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
(A) and (B) Only
✅ The correct answer is option D.