10 câu hỏi trắc nghiệm tiếng Anh SBVL (Bài 2)

• Đăng bởi: lethithanhbinh
• Sinh viên
• 17/06/2019

1, A test specimen is stressed slightly beyond the yield point and then unloaded.Its yield strength will  

(a) Decrease  
(b) Increase    

(c) Remains same 
(d) Becomes equal to ultimate tensile strength

 2, A solid uniform metal bar of diameter D and length L is hanging vertically 

from its upper end. The elongation of the bar due to self weight is:

(a) Proportional to L and inversely proportional to D²

(b) Proportional to L² and inversely proportional to D²

(c) Proportional of L but independent of D

(d) Proportional of U but independent of D 

3, The deformation of a bar under its own weight as compared to that when subjected to a direct axial load equal to its own weight will be:

(a) The same  

(b) One-fourth  

(c) Half 

(d) Double

 4, A beam is said to be of uniform strength, if

(a) The bending moment is the same throughout the beam

(b) The shear stress is the same throughout the beam

(c) The deflection is the same throughout the beam

(d) The bending stress is the same at every section along its longitudinal axis

 5, Beams of uniform strength vary in section such that

(a) bending moment remains constant 

(b) deflection remains constant

(c) maximum bending stress remains constant

(d) shear force remains constant

 6, For bolts of uniform strength, the shank diameter is made equal to

(a) Major diameter of threads  

(b) Pitch diameter of threads

(c) Minor diameter of threads  

(d) Nominal diameter of threads

 7, A bolt of uniform strength can be developed by

(a) Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt

(b) Keeping the core diameter smaller than the diameter of the unthreaded portion

(c) Keeping the nominal diameter of threads equal the diameter of unthreaded portion of the bolt

(d) One end fixed and the other end free

 8, Two tapering bars of the same material are subjected to a tensile load P. The lengths of both the bars are the same. The larger diameter of each of the bars is D. The diameter of the bar A at its smaller end is D/2 and that of the bar B is D/3. What is the ratio of elongation of the bar A to that of the bar B?

(a) 3 : 2  

(b) 2: 3  

(c) 4 : 9  

(d) 1: 3

9, A bar of length L tapers uniformly from diameter 1.1 D at one end to 0.9 D at the other end. The elongation due to axial pull is computed using mean diameter D. What is the approximate error in computed elongation?

(a) 10%   

(b) 5%  

(c) 1%   

(d) 0.5%

 10, In the case of an engineering material under unidirectional stress in the xdirection,

the Poisson's ratio is equal to (symbols have the usual meanings)

(a) e_y/e_x

(b) e_y/s_x

(c) s_y/s_x

(d) s_y/e_x