Machine design objective questions with answers part5

Q1. Cap screws are
(A) similar to small size tap bolts except that a greater variety of shapes of heads are available
(B) slotted for a screw driver and generally used with a nut
(C) used to prevent relative motion be-tween parts
(D) provided with detachable caps

Q2. An alien bolt is
(A) self locking bolt
(B) same as stud
(C) provided with hexagonal depression in head
(D) used in high speed components

Q3. The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be
(A) 28
(B) 08/02/20
(C) 48
(D) 08/04/20

Q4. Ball bearing type screws are found in following application
(A) screw jack
(B) aeroplane engines
(C) crane
(D) steering mechanism

Q5. Set screws are
(A) similar to small size tap bolts except that a greater variety of shapes of heads are available
(B) slotted for a screw driver and generally used with a nut
(C) used to prevent relative motion be-tween parts
(D) similar to stud

Q6. A self locking screw has
(A) fine threads
(B) coarse threads
(C) coefficient of friction > tangent of load angle
(D) hole for inserting split pin

Q7. Machine screws are
(A) similar to small size tap bolts except that a greater variety of shapes of heads are available
(B) slotted for a screw driver and generally used with a nut
(C) used to prevent relative motion be-tween two parts
(D) similar to stud

Q8. Rivets are generally specified by
(A) thickness of plates to be riveted
(B) length of rivet
(C) diameter of head
(D) nominal diameter

Q9. The edges of a boiler plate are bevelled to an angle of
(A) 30°
(B) 45°
(C) 60°
(D) 80°

Q10. Which of the following is a permanent fastening ?
(A) bolts
(B) keys
(C) cotters
(D) rivets

Q11. In order to avoid tearing of the plate at edge, the distance from the center line of the rivet hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to
(A) 2d
(B) 1.25 d
(C) 1.5 d
(D) 1.75 d

Q12. (If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to
(A) 0.2
(B) 0.25
(C) 0.5
(D) 0.6

Q13. Transverse fillet welded joints are designed for
(A) tensile strength
(B) compressive strength
(C) shear strength
(D) bending strength

Q14. Jam nut is a locking device in which
(A) one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
(B) a slot is cut partly in middle of nut and then slot reduced by tightening a screw
(C) a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
(D) through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end

Q15. The pitch of threads on a Jock nut in comparison to pitch of nut is
(A) same
(B) coarser
(C) finer
(D) very coarse

Q16. Buttress threads are usually found on
(A) screw cutting lathes
(B) feed mechanisms
(C) spindles of bench vices
(D) railway carriage couplings

Q17. In order to obtain bolt of uniform strength
(A) increase shank diameter
(B) increase its length
(C) drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread
(D) tighten die bolt properly

Q18. A key capable of tilting in a recess milled out in a shaft is known as
(A) wood-ruff key
(B) feather key
(C) flat saddle key
(D) hollow saddle key

Q19. A key made from a cylindrical disc having segmental cross-section, is known as
(A) wood-ruff key
(B) feather key
(C) flat saddle key
(D) hollow saddle key

Q20. A tapered key which fits in a keyway in the hub and is flat on the shaft, is known as
(A) wood-ruff key
(B) feather key
(C) flat saddle key
(D) hollow saddle key