Questions and answers for exam Preparation

MCQs

Total Questions : 98 | Page 4 of 10 pages

Question 31. A composite bar consists of a bar enclosed inside a tune of another material when compressed under a load as whole through rigid collars at the end of the bar. What will be the equation of compatibility?

W₁ + W₂ = W
W₁ + W₂ = constant
W₁/A₁E₁ = W₂/A₂E₂
W₁/A₁E₂ = W₂/A₂E₁

Discuss Question

Answer: Option A. -> W₁ + W₂ = W
Answer: (a).W₁ + W₂ = W

Question 32. A round bar made of same material consists of 4 parts each of 100mm length having diameters of 40mm, 50mm, 60mm and 70mm, respectively. If the bar is subjected to an axial load of 10kN, what will be the total elongation of the bar in mm?

0.4/πE ( 1/16 + 1/25 + 1/36 + 1/49)
4/πE ( 1/16 + 1/25 + 1/36 + 1/49)
2/πE ( 1/16 + 1/25 + 1/36 + 1/49)
40/πE ( 1/16 + 1/25 + 1/36 + 1/49)

Discuss Question

Answer: Option D. -> 40/πE ( 1/16 + 1/25 + 1/36 + 1/49)
Answer: (d).40/πE ( 1/16 + 1/25 + 1/36 + 1/49)

Question 33. A bar is in two sections having equal lengths. The area of cross section of 1st is double that of 2nd. if the bar carries an axial load of P, then what will be the ratio of elongation in section 2nd to section 1st ?

Discuss Question

Answer: Option B. -> 2
Answer: (b).2

Question 34. Which of the following stresses are associated with the tightening of a nut on a bolt?
P. Crushing and shear stress in threads
Q. Bending stress due to the bending of bolt
R. Torsional shear stress due to frictional resistance between the nut and the bolt
Select the correct answer using the codes given below:

P and Q
P and R
Only P
Only R

Discuss Question

Answer: Option A. -> P and Q
Answer: (a).P and Q

Question 35. A diagram which shows the variations of the axial load for all sections of the pan of a beam is called ____________

Bending moment diagram
Shear force diagram
Thrust diagram
Stress diagram

Discuss Question

Answer: Option D. -> Stress diagram
Answer: (d).Stress diagram

Question 36. A material has a Poisson’s ratio of 0.5. If uniform pressure of 300GPa is applied to that material, What will be the volumetric strain of it?

0.50
0.20
0.25
Zero

Discuss Question

Answer: Option D. -> Zero
Answer: (d).Zero

Question 37. What is the formula for shear stress?

Shear resistance/shear area
Force/unit area
Bending strain/area
Shear stress/length

Discuss Question

Answer: Option A. -> Shear resistance/shear area
Answer: (a).Shear resistance/shear area

Question 38. The stress induced in a body, when subjected to two equal and opposite forces which are acting tangentially across the resisting section resulting the shearing of the body across its section is called ____________

Bending stress
Compressive stress
Shear strain
Shear stress

Discuss Question

Answer: Option D. -> Shear stress
Answer: (d).Shear stress

Question 39. During a tensile test on a ductile material ____________

Nominal stress at fracture is higher than the ultimate stress
True stress at fracture is higher than the ultimate stress
True stress a fracture is the same as the ultimate stress
None of the mentioned

Discuss Question

Answer: Option B. -> True stress at fracture is higher than the ultimate stress
Answer: (b).True stress at fracture is higher than the ultimate stress

Question 40. In a tensile test, near the elastic limit zone ____________