451. Shaft coupling is used in machinery to
introduce mechanical flexibility
introduce protection against over loads
reduce the transmission of shock loads
all of these
✅ The correct answer is option D.
Machine Design MCQs
452. A screw is specified by its
major diameter
minor diameter
pitch diameter
pitch
✅ The correct answer is option A.
453. A turn buckle is used to connect two round rods subjected to tensile loading and requiring subsequent adjustment for tightening or loosening.
Yes
No
✅ The correct answer is option A.
454. In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear.
right hand
left hand
✅ The correct answer is option B.
455. A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is
1 kN-m
2 kN-m
3 kN-m
4 kN-m
✅ The correct answer is option C.
456. In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis.
equal to
twice
three times
four times
✅ The correct answer is option D.
457. Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation?
Woodruff key
Feather key
Gib-head key
Tangent key
✅ The correct answer is option D.
458. The root angle of a bevel gear is equal to
pitch angle – addendum angle
pitch angle + addendum angle
pitch angle – dedendum angle
pitch angle + dedendum
✅ The correct answer is option C.
459. The expression 0.175 – 0.841/T is the Lewis form factor for
composite and full depth involute system
20° full depth involute system
20° stub system
none of the above
✅ The correct answer is option C.
460. The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive) is called
repeated stress
yield stress
fluctuating stress
alternating stress
✅ The correct answer is option C.