Strength of Materials Quiz | Strength of Materials Multiple Choice Questions with Answers

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Questions
61 Shear stress induced in a shaft subjected to tension will be
A maximum at periphery and zero at center
B maximum at center
C uniform throughout
D none of the above

Answer: none of the above
62 In a belt drive, the pulley diameter is doubled, the belt tension and pulley width remaining same. The changes required in key will be
A increase key length
B increase key depth
C increase key width
D double all the dimensions

Answer: increase key width
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63 A key is subjected to side pressure as well at shearing forces. These pressures are called
A bearing stresses
B fatigue stresses
C crushing stresses
D resultant stresses

Answer: bearing stresses
64 The value of shear stress which is induced in the shaft due to the applied couple varies
A from maximum at the center to zero at the circumference
B from zero at the center to maximum at the circumference
C from maximum at the center to mini-mum at the cricumference
D from minimum at the centro to maxi-mum at the circumference

Answer: from zero at the center to maximum at the circumference
65 The torsional rigidity of a shaft is expressed by the
A maximum torque it can transmit
B number of cycles it undergoes before failure
C elastic limit up to which it resists torsion, shear and bending stresses
D torque required to produce a twist of one radian per unit length of shaft

Answer: torque required to produce a twist of one radian per unit length of shaft
66 The safe twisting moment for a compound shaft is equal to the
A maximum calculated value
B minimum calculated value
C mean value
D extreme value

Answer: minimum calculated value
67 Longitudinal stress in a thin cylinder is
A equal to the hoop stress
B twice the hoop stress
C half of the hoop stress
D one-fourth of hoop stress

Answer: half of the hoop stress
68 A cylindrical section having no joint is known as
A jointless section
B homogeneous section
C perfect section
D seamless section

Answer: seamless section
69 A boiler shell 200 cm diameter and plate thickness 1.5 cm is subjected to internal pressure of 1.5 MN/m , then the hoop stress will be
A 30 MN/m2
B 50 MN/m2
C 100 MN/m2
D 200 MN/m2

Answer: 100 MN/m2
70 The force acting along the circumference will cause stress in the walls in a direction normal to the longitudinal axis of cylinder; this stress is called
A longitudinal stress
B hoop stress
C yeiled stress
D ultimate stress

Answer: hoop stress
71 The deformation of a bar under its own weight compared to the deformation of same body subjected to a direct load equal to weight of the body is
A same
B double
C half
D four times

Answer: half
72 The weakest section of a diamond riveting is the section which passes through
A the first row
B the second row
C the central row
D one rivet hole of the end row

Answer: one rivet hole of the end row
73 Rivets are made of following type of material
A tough
B hard
C resilient
D ductile

Answer: ductile
74 Diamond riveted joint can be adopted in the case of following type of joint
A butt joint
B lap joint
C double riveted lap joints
D all types of joints

Answer: butt joint
75 If the rivets in adjacent rows are staggered and the outermost row has only one rivet, the arrangement of the rivets is called
A chain riveting
B zig zag riveting
C diamond riveting
D criss-cross riveting

Answer: diamond riveting
76 A riveted joint in which the number otrivets decrease from innermost to outer most row is called
A chain riveted joint
B diamond riveted joint
C criss-cross riveted joint
D zig-zag riveted joint

Answer: diamond riveted joint
77 A riveted joint in which every rivet of a row is opposite to other rivet of the outer row, is known as
A chain riveted joint
B diamond riveted joint
C criss-cross riveted joint
D zig-zag riveted joint

Answer: chain riveted joint
78 When two plates are butt together and riveted with cover plates with two rows of rivets, the joi;it is known as
A lap point
B butt joint
C single riveted single cover butt joint
D double riveted double cover butt joint

Answer: double riveted double cover butt joint
79 Efficiency of a riveted joint is the ratio of its strength (max. load it can resist without failure) to the strength of the unpunched plate in
A tension
B compression
C bearing
D any one of the above

Answer: tension
80 In riveted boiler joints, all stresses, shearing, bearing and tensile are based on the
A size of rivet
B size of the drilled or reamed hole
C average of size of rivet and hole
D smaller of the two

Answer: size of the drilled or reamed hole

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