SECTION-5

MACHINE DESIGN MCQ

##### Q51. The diameter of the hole, that must be drilled in the head of the bolt to make the bolt of uniform strength, is equal to

(a) Do – Dc
( b)Do + Dc/2
$\text { (c) } \sqrt{D_{o}^{2}-D_{c}^{2}}$
(d)Do – Dc/4
where Do = Outside diameter of thread, and Dc = Core diameter of thread.

Ans:$\text { (c) } \sqrt{D_{o}^{2}-D_{c}^{2}}$

##### Q52. On which the resultant axial load on a bolt depends

(a) the initial tension due to tightening of the bolt
(b) the external load applied
(c) the relative elastic yielding of the bolt and the connected member
(d) all of the above

Ans:(d) all of the above

##### Q53. The resultant axial load (P) on a bolt is given by

(a) P = P1 +a /a+1  P2
(b) P = P1 -a /a+1  P2
(c) P =P = P1 +a /a-1  P2
(d) P = P = P1 + a +1/a  P2
where P1 = Initial tension in the bolt due to tightening up,
P2 = External load on the bolt, and
a = Ratio of elasticity of connected parts to the elasticity of the bolt.

Ans:(a) P = P1 +a /a+1  P2

##### Q54. When a soft gaskets are connected by large bolts, then the resultant axis load on the bolt is equal to

(a) sum of initial tension and external load applied
(b) mean of the initial tension and external load applied
(c) initial tension only
(d) external load only

Ans:(a) sum of initial tension and external load applied

(a) M × 6 × 1
(b) M 6 × l
(c) 6 M × l
(d) M 6.

Ans:(d) M 6.

(a) M × 36 × 3
(b) M 36 × 3
(c) 36 M × 3
(d) M 36.

Ans:(b) M 36 × 3

(a) 3 mm
(b) 2 mm
(c) 1.5 mm
(d) 1 mm.

Ans:(b) 2 mm

(a) 3 mm
(b) 2 mm
(c) 1.5 mm
(d) 1 mm.

Ans:(a) 3 mm

##### Q60. The included angle for Buttress threads is

(a) 60°
(b) 55°
(c) 45°
(d) 29°.

Ans:(c) 45°

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##### Read More Sections of Machine Design

Each section contains maximum 80 Questions. To practice more questions visit other sections.

Machine Design MCQ – Section-1

Machine Design MCQ – Section-2

Machine Design MCQ – Section-3

Machine Design MCQ – Section-4

Machine Design MCQ – Section-5

Machine Design MCQ – Section-6

Machine Design MCQ – Section-7