411. The strength of the un-riveted plate (P) per pitch length is equal to
p.d.σt
p.t.σt
(p – d)σt
(p – d)tσt
✅ The correct answer is option B.
Machine Design MCQs
412. When carbon in the cast iron is in the form of cementite, the cast iron will be of white colour.
Correct
Incorrect
✅ The correct answer is option A.
413. A triple riveted butt joint with double straps of unequal width is to be designed for a boiler shell. The pitch of the rivets in the outer row is double the pitch in the inner row and zig-zag riveting is proposed. Which of the following statement is correct?
There are four rivets per pitch length, all in double shear
There are four rivets per pitch length, out of which two are in single shear and two are in double shear
There are five rivets per pitch length, all in double shear
There are five rivets
✅ The correct answer is option D.
414. The longitudinal joint in boilers is used to get the required
length of boiler
diameter of boiler
length and diameter of boiler
efficiency of boiler
✅ The correct answer is option B.
415. The groove angle of the pulley for rope drive is usually
20°
35°
45°
60°
✅ The correct answer is option C.
416. A column of length l is fixed at both ends. The equivalent length of the column is
l/2
l/2
l
2 l
✅ The correct answer is option A.
417. Euler’s formula for a mild steel column is not valid if the slenderness ratio is
60
90
100
120
✅ The correct answer is option A.
418. The wire ropes make contact at
bottom of groove of the pulley
sides of groove of the pulley
sides and bottom of groove of the pulley
anywhere in the groove
✅ The correct answer is option A.
419. The difference between the upper limit and lower limit of a dimension is called
nominal size
basic size
actual size
tolerance
✅ The correct answer is option D.
420. The speed of the sprocket reduces as the chain pitch __________ for a given number of teeth.
increases
decreases
✅ The correct answer is option A.