SECTION-5

MACHINE DESIGN MCQ

##### Q41. The efficiency of a square threaded screw will be maximum, if the helix angle is equal to

(a)π/4 + φ/ 2
(b)π/4– φ
(c) π /4− φ/ 2
(d) π/4+ φ
where φ = Angle of friction.

Ans:(c) π /4− φ/ 2

(a) 15400 N
(b) 16800 N
(c) 12600 N
(d) 9800 N.

Ans:(c) 12600 N

(a) 15400 N
(b) 16800 N
(c) 12600 N
(d) 9800 N.

Ans:(a) 15400 N

(a) 15400 N
(b) 16800 N
(c) 12600 N
(d) 9800 N.

Ans:(d) 9800 N.

(a) 15400 N
(b) 16800 N
(c) 12600 N
(d) 9800 N.

Ans:(d) 9800 N.

(a) 80%
(b) 70%
(c) 58.33%
(d) 50%.

Ans:(c) 58.33%

##### Q47. The rotation of a bolt, while screwing a nut on or off the bolt, is prevented by providing on the bolt

(a) a square neck
(b) a pip
(c) a snug
(d) any one of the above
(e) none of the above.

Ans:(c) a snug

##### Q48. The locking arrangement for the nut is done by

(a) a split pin
(b) a slotted nut
(c) a castle nut
(d) a sawn nut

Ans:(d) a sawn nut

##### Q49. If the nut is made of a weaker material than the bolt, then the height of the nut should be

(a) equal to nominal diameter of the bolt
(b) less than the nominal diameter of the bolt
(c) more than the nominal diameter of the bolt
(d) none of the above.

Ans:(c) more than the nominal diameter of the bolt

##### Q50. Choose the wrong statement

(a) For leak-proof joint, the circumferential pitch of the studs should be between 20 $\sqrt{d}_{1}$ and 30 $\sqrt{d}_{1}$where d1 is thediameter of stud hole in mm.
(b) The effective height of the nut is made equal to the nominal diameter of the bolt, when a nut and bolt are made of mild steel.
(c) If an axial hole is drilled through the head of a bolt upto threaded portion such that the area of the shank becomes equal to the root area of the thread, the bolt of uniform strength is obtained.
(d) Turn buckle has left hand threads on both ends.

Ans:(d) Turn buckle has left hand threads on both ends.

2      3      4      5      6      7      8

DEAR READERS IF YOU FIND ANY ERROR/TYPING MISTAKE PLEASE LET ME KNOW IN THE COMMENT SECTIONS OR E-MAIL: [email protected]

##### 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