Design of Machine Elements MCQ Questions and answers

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Q. 1816mm and radius of centroidal axis is 100mm, then find the bending stress at inner fibre whose radius is 50mm. Area of cross section of beam is 7200mm² and the beam is loaded with 100kN of load.

(A) 97.3
(B) 95.8
(C) 100.6
(D) none of the mentioned

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Q. 1816/ [7200 x 10.8184 x 50] or σ=100.6N/mm².

(A) 14.80mm
(B) 13.95mm
(C) 16.5mm
(D) 17.2mm

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Q. A curved beam with eccentricity 0.02D is loaded with 1kN.Centroidal radius=4D and inner and outer radii are 3.5D and 4.5D respectively. Area of cross section is 0.8D². Find the dimension D if allowable stress is 110N/mm² and considering only direct tensile stress.

(A) 4.7mm
(B) 6.8mm
(C) 13.95mm
(D) 3.4mm

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Q. All type of stresses vanishes after as soon as the applied load is removed.

(A) true
(B) false
(C) ---
(D) ---

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Q. Residual stresses are always added in the load stresses and hence are always harmful.

(A) true
(B) false
(C) ---
(D) ---

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Q. Which of the following is the numerator of factor safety formula?

(A) working stress
(B) shear stress
(C) tensile stress
(D) ultimate stress

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Q. Which of the following can be the factor of safety for shock loading?

(A) 11
(B) 13
(C) 4
(D) 7

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Q. Factor of safety is used to find out the reliability of the design.

(A) true
(B) false
(C) ---
(D) ---

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Q. What can understand by the factor of safety equal to one?

(A) it means that the structure will fail under load
(B) it means that the structure will only support the actual load
(C) it means that the structure will support more than the actual load
(D) there is no relation between factor safety and load application

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Q. For which of the following design factor of

(A) 0.1
(B) 1
(C) 2
(D) 0.9

Design of Machine Elements MCQs with answers Page - 11

Q. 1816mm and radius of centroidal axis is 100mm, then find the bending stress at inner fibre whose radius is 50mm. Area of cross section of beam is 7200mm² and the beam is loaded with 100kN of load.

Q. 1816/ [7200 x 10.8184 x 50] or σ=100.6N/mm².

Q. A curved beam with eccentricity 0.02D is loaded with 1kN.Centroidal radius=4D and inner and outer radii are 3.5D and 4.5D respectively. Area of cross section is 0.8D². Find the dimension D if allowable stress is 110N/mm² and considering only direct tensile stress.

Q. All type of stresses vanishes after as soon as the applied load is removed.

Q. Residual stresses are always added in the load stresses and hence are always harmful.

Q. Which of the following is the numerator of factor safety formula?

Q. Which of the following can be the factor of safety for shock loading?

Q. Factor of safety is used to find out the reliability of the design.

Q. What can understand by the factor of safety equal to one?

Q. For which of the following design factor of

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