Bending Stresses in Machine Elements - Mechanical Engineering (MCQ) questions and answers

1)   What is the moment of inertia acting on a rectangle of width 15 mm and depth 40 mm about base by using theorem of parallel axes?

a. 320 x 103 mm4
b. 300 x 103 mm4
c. 240 x 103 mm4
d. 80 x 103 mm4
Answer  Explanation 

ANSWER: 320 x 103 mm4

Explanation:
No explanation is available for this question!
2)   A uniformly distributed load of 20 kN/m acts on a simply supported beam of rectangular cross section of width 20 mm and depth 60 mm. What is the maximum bending stress acting on the beam of 5m?

a. 5030 Mpa
b. 5208 Mpa
c. 6600 Mpa
d. Insufficient data
Answer  Explanation 

ANSWER: 5208 Mpa

Explanation:
No explanation is available for this question!
3)   Moment of inertia acting on a semi-circle about symmetrical axes is given as _______

a. 1.57 r4
b. 0.055 r4
c. 0.392 r4
d. 0.11 r4
Answer  Explanation 

ANSWER: 0.392 r4

Explanation:
No explanation is available for this question!
4)   What is the S.I. unit of sectional modulus?

a. mm4
b. mm3
c. mm2
d. m
Answer  Explanation 

ANSWER: mm3

Explanation:
No explanation is available for this question!
5)   What is the moment of inertia acting on a circle of diameter 50 mm?

a. 122.71 x 103 mm4
b. 306.79 x 103 mm4
c. 567.23 x 103 mm4
d. 800 x 103 mm4
Answer  Explanation 

ANSWER: 306.79 x 103 mm4

Explanation:
No explanation is available for this question!
6)   Which of the following relations is used to represent theorem of perpendicular axes?
(H = Vertical axis, I = Moment of inertia and K = Radius of gyration)

a. IPQ = Ixx + AH2
b. IPQ = Ixx + Ak2
c. Izz = Ixx + Iyy
d. Izz + Ixx + Iyy = 0
Answer  Explanation 

ANSWER: Izz = Ixx + Iyy

Explanation:
No explanation is available for this question!
7)   What is the moment of inertia acting on a semicircle of radius 20 mm about the asymmetrical axes?

a. 125.663 x 103 mm4
b. 17600 mm4
c. 1500 mm4
d. 8800 mm4
Answer  Explanation 

ANSWER: 17600 mm4

Explanation:
No explanation is available for this question!
8)   What is the product of sectional modulus and allowable bending stress called as?

a. Moment of inertia
b. Moment of rigidity
c. Moment of resistance
d. Radius of gyration
Answer  Explanation 

ANSWER: Moment of resistance

Explanation:
No explanation is available for this question!
9)   The bending formula is given as _____

a. (M/E) = (σ/y) = (R/I)
b. (M/y) = (σ/I) = (E/R)
c. (M/I) = (σ/y) = (E/R)
d. none of the above
Answer  Explanation 

ANSWER: (M/I) = (σ/y) = (E/R)

Explanation:
No explanation is available for this question!
10)   Which of the following laminas have same moment of inertia (Ixx = Iyy), when passed through the centroid along x-x and y-y axes?

a. Circle
b. Semi-circle
c. Right angle triangle
d. Isosceles triangle
Answer  Explanation 

ANSWER: Circle

Explanation:
No explanation is available for this question!

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