TRUE
FALSE
✅ The correct answer is option A.
Machine Design MCQs
The square threads are not so strong as V-threads but they offer less frictional resistance to motion than Whitworth threads.
Correct
Incorrect
✅ The correct answer is option A.
Two shafts A and B under pure torsion are of identical length and identical weight and are made of the same material. The shaft A is solid and the shaft B is hollow. We can say that
shaft B is better than shaft A
shaft A is better than shaft B
both the shafts are equally good
✅ The correct answer is option A.
Circumferential joint in boilers is used to get the required length of a boiler.
TRUE
FALSE
✅ The correct answer is option A.
A shaft is subjected to a maximum bending stress of 80 N/mm2 and maximum shearing stress equal to 30 N/mm2 at a particular section. If the yield point in tension of the material is 280 N/mm2 and the maximum shear stress theory of failure is used, then the factor of safety obtained will be
2.5
2.8
3
3.5
✅ The correct answer is option B.
A sliding bearing which operates without any lubricant present, is called
zero film bearing
boundary lubricated bearing
hydrodynamic lubricated bearing
hydrostatic lubricated
✅ The correct answer is option A.
The included angle for the V-belt is usually
10°-20°
30°-40°
40°-60°
60°-80°
✅ The correct answer is option B.
The contact ratio is the ratio of
length of path of contact to the circular pitch
length of arc of contact to the circular pitch
length of arc of approach to the circular pitch
length of arc of reces
✅ The correct answer is option B.
The coefficient of friction between the belt and pulley depends upon the
material of belt and pulley
slip of belt
speed of belt
all of these
✅ The correct answer is option D.
The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called
working depth
clearance
face width
backlash
✅ The correct answer is option D.