21. A shoe brake is commonly used in railway trains.
Yes
No
✅ The correct answer is option A.
Machine Design MCQs
22. According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be
45 to 60%
63 to 70%
70 to 83%
80 to 90%
✅ The correct answer is option D.
23. The diameter of knuckle pin in a knuckle joint is usually taken as (where d = Diameter of the rod)
0.5 d
0.8 d
d
1.2 d
✅ The correct answer is option C.
24. In case of thick cylinders, the tangential stress across the thickness of cylinder is
maximum at the outer surface and minimum at the inner surface
maximum at the inner surface and minimum at the outer surface
maximum at the inner surface and zero at the outer surface
maximum at the outer s
✅ The correct answer is option B.
25. A spring is used to
measure forces
apply forces
store energy
all of these
✅ The correct answer is option D.
26. When percentage of carbon in steel is increased, the ductility of steel decreases.
Correct
Incorrect
✅ The correct answer is option A.
27. The algebraic difference between the maximum limit and the basic size is called
lower deviation
upper deviation
actual deviation
mean deviation
✅ The correct answer is option B.
28. The ratio of the ultimate stress to the design stress is known as
elastic limit
strain
factor of safety
bulk modulus
✅ The correct answer is option C.
29. The fatigue stress concentration factor is defined as
the ratio of endurance limit with stress concentration to the endurance limit without stress concentration
the ratio of endurance limit without stress concentration to the endurance limit with stress concentration
the product of the endurance limits with and without stress concentration
all of the above
✅ The correct answer is option B.
30. Creep in belt is due to
material of the belt
material of the pulley
uneven extensions and contractions due to varying tension
all of the above
✅ The correct answer is option C.