Machine Design - Practice Test

[#281] Ball bearing type screws are found in following application

(A) Screw jack

(B) Aeroplane engines

(C) Crane

(D) Steering mechanism

Correct Answer

(D) Steering mechanism

[#282] According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)

(A) $$frac{pi }{4}{{ ext{d}}^2} imes au imes { ext{n}}$$

(B) $$1.875 imes frac{pi }{4}{{ ext{d}}^2} imes au imes { ext{n}}$$

(C) $$2 imes frac{pi }{4}{{ ext{d}}^2} imes au imes { ext{n}}$$

(D) $$3 imes frac{pi }{4}{{ ext{d}}^2} imes au imes { ext{n}}$$

Correct Answer

(B) $$1.875 imes frac{pi }{4}{{ ext{d}}^2} imes au imes { ext{n}}$$

[#283] If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to

(A) 0.2

(B) 0.25

(C) 0.50

(D) 0.6

Correct Answer

(B) 0.25

[#284] The product of the diametral pitch and circular pitch is equal to

(A) 1

(B) $$frac{1}{pi }$$

(C) $$pi $$

(D) $$pi $$ × number of teeth

Correct Answer

(C) $$pi $$

[#285] According to Rankine's theory, the failure occurs at a point in a member

(A) When the maximum shear stress in a biaxial stress system reaches the shear stress at elastic limit in a simple tension test

(B) When the maximum principal stress in a biaxial stress system reaches the elastic limit of the material in a simple tension test

(C) When the strain energy per unit volume in a biaxial stress system reaches the strain energy at the elastic limit per unit volume as determined from a simple tension test

(D) When the maximum principal strain in a biaxial stress system reaches the strain at the elastic limit as determined from a simple tension test

Correct Answer

(B) When the maximum principal stress in a biaxial stress system reaches the elastic limit of the material in a simple tension test

Machine Design - Study Mode

[#281] Ball bearing type screws are found in following application

Correct Answer

[#282] According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)

Correct Answer

[#283] If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to

Correct Answer

[#284] The product of the diametral pitch and circular pitch is equal to

Correct Answer

[#285] According to Rankine's theory, the failure occurs at a point in a member

Correct Answer