Design of Machine Elements MCQ Questions and answers

A

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Q. What is a safe factor of failure for a component which on failure can result in financial loss or serious injury?

(A) 1
(B) 2
(C) 3
(D) 4

A

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Q. Design factor for most aircraft structures is 2.

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

A

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Q. Does ASME Standard take into consideration shock and fatigue factors?

(A) yes
(B) no
(C) ---
(D) ---

A

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Q. Calculate the tension in the rope of pulley C.

"The layout of a shaft supported on bearings at A & B is shown. Power is supplied by means of a vertical belt on pulley B which is then transmitted to pulley C carrying a horizontal belt. The angle of wrap is 180’ and coefficient of friction is 0.3. Maximum permissible tension in the rope is 3kN. The radius of pulley at B & C is 300mm and 150mm"

(A) 6778.3n and 7765.3n
(B) 5948.15n and 2288.75n
(C) 5468.4n ad 8678.3n
(D) none of the listed

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Q. If bending moment on point B in horizontal plate is M and in vertical plane is m, then the net bending moment at point B is?

"The layout of a shaft supported on bearings at A & B is shown. Power is supplied by means of a vertical belt on pulley B which is then transmitted to pulley C carrying a horizontal belt. The angle of wrap is 180’ and coefficient of friction is 0.3. Maximum permissible tension in the rope is 3kN. The radius of pulley at B & C is 300mm and 150mm"

(A) m
(B) m
(C) m+m
(D) √m²+m²

A

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Q. If yielding strength=400N/mm², the find the permissible shear stress according to ASME standards.

(A) 72 n/mm²
(B) 76 n/mm²
(C) 268 n/mm²
(D) 422 n/mm²

A

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Q. The strength of hollow shaft is more than the strength of solid shaft of same weight.

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

A

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Q. Solid shafts are used in epicyclic gearboxes.

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

A

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Q. Refer to fig
Two plates are fastened by means of two bolts.
The yield strength of bolt is 400N/mm² and factor of safety is 4.
Determine the size of the bolts.

(A) 8mm
(B) 9mm
(C) 10mm
(D) 11mm

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Q. 8’CW from the vertical. Hence net shear force = √ [5000cos36.8+1250]²+ [5000sin36.8]².

(A) 10.74mm
(B) 9.23mm
(C) 11.54mm
(D) 8.68mm

Design of Machine Elements MCQs with answers Page - 12

Q. What is a safe factor of failure for a component which on failure can result in financial loss or serious injury?

Q. Design factor for most aircraft structures is 2.

Q. Does ASME Standard take into consideration shock and fatigue factors?

Q. If yielding strength=400N/mm², the find the permissible shear stress according to ASME standards.

Q. The strength of hollow shaft is more than the strength of solid shaft of same weight.

Q. Solid shafts are used in epicyclic gearboxes.

Q. Refer to fig
Two plates are fastened by means of two bolts.
The yield strength of bolt is 400N/mm² and factor of safety is 4.
Determine the size of the bolts.

Q. 8’CW from the vertical. Hence net shear force = √ [5000cos36.8+1250]²+ [5000sin36.8]².

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Design of Machine Elements MCQs with answers Page - 12

Q. What is a safe factor of failure for a component which on failure can result in financial loss or serious injury?

Q. Design factor for most aircraft structures is 2.

Q. Does ASME Standard take into consideration shock and fatigue factors?

Q. If yielding strength=400N/mm², the find the permissible shear stress according to ASME standards.

Q. The strength of hollow shaft is more than the strength of solid shaft of same weight.

Q. Solid shafts are used in epicyclic gearboxes.

Q. Refer to fig Two plates are fastened by means of two bolts. The yield strength of bolt is 400N/mm² and factor of safety is 4. Determine the size of the bolts.

Q. 8’CW from the vertical. Hence net shear force = √ [5000cos36.8+1250]²+ [5000sin36.8]².

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Q. Refer to fig
Two plates are fastened by means of two bolts.
The yield strength of bolt is 400N/mm² and factor of safety is 4.
Determine the size of the bolts.