Tài liệu học tập

MEC211: Câu hỏi trắc nghiệm 2 (tiếng Anh)

  • Đăng bởi: lethithanhbinh
  • Sinh viên
  • 18/05/2019

1. A rod of length L and diameter D is subjected to a tensile load P. Which of the following is sufficient to calculate the resulting change in diameter? 

(a) Young's modulus 
(b) Shear modulus 

(c) Poisson's ratio 
(d) Both Young's modulus and shear modulus 


Đáp án D

 

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

 

Đáp án A

 

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

 

Đáp án C

 

4. Which one of the following statements is correct? 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

 

Đáp án D

 

5. Which one of the following statements is correct? 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

 

Đáp án C