491. At low temperatures (say 75°C) the notched-bar impact value of steel____________________?
A. increases markedly
B. decreases markedly
C. remains same
D. depends on heat treatment carried out
E. none of the above
492. The crest diameter of a screw thread is same as _____________________?
A. major diameter
B. minor diameter
C. pitch diameter
D. core diameter
E. none of the above
493. Maximum principal stress theory is applicable for_____________________?
A. ductile materials
B. brittle materials
C. elastic materials
D. all of the above
E. none of the above
494. A stud________________________?
A. has a head on one end and a nut fitted to the other
B. has head at one end and other end fits into a tapped hole in the other part to be joined
C. has both the ends threaded
D. has pointed threads
E. requires locking nuts
495. A tap bolt_____________________?
A. has a head on one end and a nut fitted to the other
B. has head at one end and other end fits into a tapped hole in the other part o be joined
C. has both the ends threaded
D. has pointed threads
E. requires locking devices
496. The included angle in unified of American National threads is___________________?
A. 60°
B. 55°
C. 47°
D. 29°
E. none of the above
497. 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
E. similar to stud
498. 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. 8/2
C. 48
D. 8/4
E. none of the above
499. 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
E. none of the above
500. 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
E. provided with countersunk head
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