Machine design objective questions with answers part4

Q1. Fibrous fracture occurs in
(A) ductile material
(B) brittle material
(C) elastic material
(D) hard material

Q2. Turn buckle has
(A) right hand threads on bout ends
(B) left hand threads on both ends
(C) left hand threads on one end and right hand threads on other end
(D) no threads

Q3. Eye bolts are used for
(A) foundation purposes
(B) absorbing shock and vibrations
(C) transmission of power
(D) lifting and transportation of machines and cubicles

Q4. Elastic nut is a locking device in which
(A) one small 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) hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed 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 pin splitted and bent in reverse direction at other end

Q5. If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation
(A) 124 d
(B) 148 d
(C) 151 d
(D) 168 d

Q6. If threads on a bolt are left hand, threads on nut will be
(A) right hand with same pitch
(B) left hand with same pitch
(C) could be left or right hand
(D) right hand with fine pitch

Q7. Taper usually provided on cotter is
(A) 1 in 5
(B) 1 in 10
(C) 1 in 24
(D) 1 in 40

Q8. Applications in which stresses are encountered in one direction only uses following type of threads
(A) metric
(B) buttress
(C) acme
(D) square

Q9. The draw of cotter need not exceed
(A) 3 mm
(B) 5 mm
(C) 10 mm
(D) 20 mm

Q10. A bench vice has following type of threads
(A) metric
(B) square
(C) buttress
(D) acme

Q11. The valve rod in a steam engine is connected to an eccentric rod by
(A) cotter joint
(B) bolted joint
(C) kunckle joint
(D) universal coupling

Q12. Split 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 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 pin splitted and bent in reverse direction at the other end

Q13. Taper on the cotter and slot is provided
(A) on both the sides
(B) on one side only
(C) on none of the sides
(D) may be provided anywhere

Q14. The function of cutting oil when threading a pipe is to
(A) provide cooling action
(B) lubricate the dies
(C) help remove chips
(D) all of the above

Q15. Silver-based solder is used for
(A) flaring
(B) brazing
(C) soft soldering
(D) fusion welding

Q16. For tight leakage joints, following type of thread is best suited
(A) buttress
(B) square
(C) acme
(D) NPT (national pipe threads)

Q17. In order to permit the thermal expansion/contraction of tubing, it should be
(A) crimped
(B) honed
(C) flared
(D) bent

Q18. A tube has the following advantage over pipe
(A) lighter and easier to handle
(B) greater shock absorption
(C) smoother inside walls
(D) all of the above

Q19. The strap end of a connecting rod of steam engine is joined by
(A) gib of cotter joint
(B) sleeve and cotter joint
(C) spigot socket cotter joint
(D) knuckle joint

Q20. A backing ring is used inside the pipe joint when making a
(A) butt weld
(B) fillet weld
(C) sleeve weld
(D) socket weld