4791 + Mcqs in Mechanical Engineering Page 64 McqOptions

3151.	In the below figure, the point B represents upper yield point.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

3152.	When a bar is subjected to a change of temperature and its deformation is prevented, the stress induced in the bar is
A.	tensile stress
B.	compressive stress
C.	shear stress
D.	thermal stress
Answer» E.

Discussion

3153.	The Young's modulus of a material is 125 GPa and Poissons ratio is 0.25. The modulus of rigidity of me material is
A.	30 GPa
B.	50 GPa
C.	80 GPa
D.	100 GPa
Answer» C. 80 GPa

Discussion

3154.	The layer at the centre of gravity of the beam as shown in the below figure, will be
A.	in tension
B.	in compression
C.	neither in tension nor in compression
Answer» D.

Discussion

3155.	A simply supported beam 'A' of length l, breadth b and depth d carries a central point load W. Another bream 'B' has the same length and breadth but its depth is doubled. The deflection of beam 'B' will be double as compared to beam 'A'.
A.	Correct
B.	Incorrect
Answer» C.

Discussion

3156.	The torsional rigidity of a shaft is expressed by the torque required to produce a twist of one radian per unit length of a shaft.
A.	True
B.	False
Answer» B. False

Discussion

3157.	When a body is subjected to a direct tensile stress ( x) in one plane accompanied by a simple shear stress ( xy ), the minimum normal stress is
A.	<img src="/_files/images/mechanical-engineering/strength-of-materials/90-86-1.png">
B.	<img src="/_files/images/mechanical-engineering/strength-of-materials/90-86-2.png">
C.	<img src="/_files/images/mechanical-engineering/strength-of-materials/90-86-3.png">
D.	<img src="/_files/images/mechanical-engineering/strength-of-materials/90-86-4.png">
Answer» C. <img src="/_files/images/mechanical-engineering/strength-of-materials/90-86-3.png">

Discussion

3158.	The stress developed in the material without any permanent set is called
A.	elastic limit
B.	yield stress
C.	ultimate stress
D.	breaking stress
Answer» B. yield stress

Discussion

3159.	In the below figure, curve C represents soft brass.
A.	True
B.	False
Answer» C.

Discussion

3160.	When a change in length takes place, the strain is known as
A.	linear strain
B.	lateral strain
C.	volumetric strain
D.	shear strain
Answer» B. lateral strain

Discussion

3161.	A beam which is fixed at one end and free at the other is called
A.	simply supported beam
B.	fixed beam
C.	overhanging beam
D.	cantilever beam
Answer» E.

Discussion

3162.	When a body is subjected to three mutually perpendicular stresses, of equal intensity, the ratio of direct stress to the corresponding volumetric strain is known as
A.	Young's modulus
B.	modulus of rigidity
C.	bulk modulus
D.	Poisson's ratio
Answer» D. Poisson's ratio

Discussion

3163.	The factor of safety is always more than unity.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

3164.	Mohr's circle is used to determine the stresses on an oblique section of a body subjected to
A.	direct tensile stress in one plane accompanied by a shear stress
B.	direct tensile stress in two mutually perpendicular directions
C.	direct tensile stress in two mutually perpendicular directions accompanied by a simple shear stress
D.	all of the above
Answer» E.

Discussion

3165.	The proof resilience is the maximum strain energy which can be stored in a body.
A.	Yes
B.	No
Answer» B. No

Discussion

3166.	The state of stress at a point in a loaded member is shown in the below figure. The magnitude of maximum shear stress is
A.	10 MPa
B.	30 MPa
C.	50 MPa
D.	100 MPa
Answer» D. 100 MPa

Discussion

3167.	When a body is subjected to two equal and opposite forces, acting tangentially across the resisting section, as a result of which the body tends to shear off across the section, the stress and strain induced is
A.	tensile stress, tensile strain
B.	compressive stress, compressive strain
C.	shear stress, tensile strain
D.	shear stress, shear strain
Answer» E.

Discussion

3168.	A localised compressive stress at the area of contact between two members is known as
A.	tensile stress
B.	bending stress
C.	crushing stress
D.	shear stress
Answer» D. shear stress

Discussion

3169.	Two closely-coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is double that of spring 'B'. The stiffness of spring 'A' will be __________ that of spring 'B'.
A.	one-sixteenth
B.	one-eighth
C.	one-fourth
D.	one-half
Answer» E.

Discussion

3170.	The stiffness of a closely-coiled helical spring is __________ proportional to number of turns.
A.	directly
B.	inversely
Answer» C.

Discussion

3171.	The equivalent length, of a given column with given end conditions, is the length of an equivalent column of the same material and cross-section with hinged ends, and having the value of crippling load equal to that of the given column.
A.	True
B.	False
Answer» B. False

Discussion

3172.	A body is subjected to a direct tensile stress ( ) in one plane. The shear stress is maximum at a section inclined at __________ to the normal of the section.
A.	45 and 90
B.	45 and 135
C.	60 and 150
D.	30 and 135
Answer» C. 60 and 150

Discussion

3173.	The bending moment on a section is maximum where shear force is
A.	minimum
B.	maximum
C.	changing sign
D.	zero
Answer» D. zero

Discussion

3174.	A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum shear stress will be
A.	400 MPa
B.	500 MPa
C.	900 MPa
D.	1400 MPa
Answer» C. 900 MPa

Discussion

3175.	The shear stress at the centre of a circular shaft under torsion is
A.	zero
B.	minimum
C.	maximum
D.	infinity
Answer» B. minimum

Discussion

3176.	At the neutral axis of a beam, the shear stress is
A.	zero
B.	minimum
C.	maximum
D.	infinity
Answer» D. infinity

Discussion

3177.	The maximum deflection of a cantilever beam of length l with a uniformly distributed load of w per unit length is (where W = wl)
A.	<img src="/_files/images/mechanical-engineering/strength-of-materials/105-251-1.png">
B.	<img src="/_files/images/mechanical-engineering/strength-of-materials/105-251-2.png">
C.	<img src="/_files/images/mechanical-engineering/strength-of-materials/105-251-3.png">
D.	<img src="/_files/images/mechanical-engineering/strength-of-materials/105-251-4.png">
Answer» C. <img src="/_files/images/mechanical-engineering/strength-of-materials/105-251-3.png">

Discussion

3178.	The slenderness ratio is the ratio of
A.	area of column to least radius of gyration
B.	length of column to least radius of gyration
C.	least radius of gyration to area of column
D.	least radius of gyration to length of column
Answer» C. least radius of gyration to area of column

Discussion

3179.	When two shafts of same length, one of which is hollow, transmit equal torques and have equal maximum stress, then they should have equal
A.	polar moment of inertia
B.	polar modulus
C.	diameter
D.	angle of twist
Answer» C. diameter

Discussion

3180.	According to Euler's column theory, the crippling load for a column of length (l) fixed at both ends is __________ the crippling load for a similar column hinged at both ends.
A.	equal to
B.	two times
C.	four times
D.	eight times
Answer» D. eight times

Discussion

3181.	In a cantilever beam of length l subjected to a uniformly distributed load of w per unit length, the maximum deflection lies at the fixed end.
A.	Yes
B.	No
Answer» C.

Discussion

3182.	A lap joint is always in __________ shear.
A.	single
B.	double
Answer» B. double

Discussion

3183.	The efficiency of a riveted joint is the ratio of the strength of the joint to the strength of the solid plate.
A.	True
B.	False
Answer» B. False

Discussion

3184.	The elongation of a conical bar under its own weight is __________ that of prismatic bar of the same length.
A.	equal to
B.	half
C.	one-third
D.	two-third
Answer» D. two-third

Discussion

3185.	According to Euler's column theory, the crippling load for a column of length (l) with one end fixed and the other end free is __________ the crippling load for a similar column hinged at both the ends.
A.	equal to
B.	less than
C.	more than
Answer» C. more than

Discussion

3186.	The shear force diagram for a simply supported beam carrying a uniformly distributed load of w per unit length, consists of
A.	one right angled triangle
B.	two right angled triangles
C.	one equilateral triangle
D.	two equilateral triangles
Answer» C. one equilateral triangle

Discussion

3187.	When a cantilever beam is loaded at its free end, the maximum compressive stress shall develop at
A.	bottom fibre
B.	top fibre
C.	neutral axis
D.	centre of gravity
Answer» B. top fibre

Discussion

3188.	The maximum shear stress of a beam of triangular section occurs above the neutral axis,
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

3189.	The Poisson's ratio for cast iron varies from
A.	0.33 to 0.37
B.	0.21 to 0.26
C.	0.31 to 0.34
D.	0.32 to 0.42
Answer» C. 0.31 to 0.34

Discussion

3190.	The strain energy stored in a spring, when subjected to maximum load, without suffering permanent distortion, is known as
A.	impact energy
B.	proof resilience
C.	proof stress
D.	modulus of resilience
Answer» C. proof stress

Discussion

3191.	The Rankine's theory for active earth pressure is based on the assumption that
A.	the retained material is homogeneous and cohesionless
B.	the frictional resistance between the retaining wall and the retained material is neglected
C.	the failure of the retained material takes place along a plane called rupture plane
D.	all of the above
Answer» E.

Discussion

3192.	An overhanging beam must overhang on both sides.
A.	Correct
B.	Incorrect
Answer» C.

Discussion

3193.	The resultant stress on an inclined plane which is inclined at an angle to the normal cross-section of a body which is subjected to a direct tensile stress ( ) in one plane, is
A.	sin
B.	cos
C.	sin 2
D.	cos 2
Answer» C. sin 2

Discussion

3194.	Two shafts 'A' and 'B' are made of same material. The shaft 'A' is solid and has diameter D. The shaft 'B' is hollow with outer diameter D and inner diameter D/2. The strength of hollow shaft in torsion is __________ as that of solid shaft.
A.	1/16
B.	1/8
C.	1/4
D.	15/16
Answer» E.

Discussion

3195.	The extremeties of any diameter on Mohr's circle represent
A.	principal stresses
B.	normal stresses on planes at 45
C.	shear stresses on planes at 45
D.	normal and shear stresses on a plane
Answer» C. shear stresses on planes at 45

Discussion

3196.	For a 25 mm hole drilled in plates, the diameter of rivet shank should be
A.	23mm
B.	24.5mm
C.	25mm
D.	26mm
Answer» B. 24.5mm

Discussion

3197.	When a thin cylindrical shell is subjected to an internal pressure, there will be
A.	a decrease in diameter and length of the shell
B.	an increase in diameter and decrease in length of the shell
C.	a decrease in diameter and increase in length of the shell
D.	an increase in diameter and length of the shell
Answer» E.

Discussion

3198.	The shear force diagram fora cantilever beam of length l and carrying a gradually varying load from zero at free end and w per unit length at the fixed end is a
A.	horizontal straight line
B.	vertical straight line
C.	inclined line
D.	parabolic curve
Answer» E.

Discussion

3199.	The polar moment of inertia of a hollow shaft of outer diameter (D) and inner diameter (d) is
A.	<img src="/_files/images/mechanical-engineering/strength-of-materials/109-278-1.png">
B.	<img src="/_files/images/mechanical-engineering/strength-of-materials/109-278-2.png">
C.	<img src="/_files/images/mechanical-engineering/strength-of-materials/109-278-3.png">
D.	<img src="/_files/images/mechanical-engineering/strength-of-materials/109-278-4.png">
Answer» D. <img src="/_files/images/mechanical-engineering/strength-of-materials/109-278-4.png">

Discussion

3200.	In the below figure, the stress corresponding to point D is
A.	yield point stress
B.	breaking stress
C.	ultimate stress
D.	elastic limit
Answer» D. elastic limit

Discussion

Explore topic-wise MCQs in Engineering.

In the below figure, the point B represents upper yield point.

When a bar is subjected to a change of temperature and its deformation is prevented, the stress induced in the bar is

The Young's modulus of a material is 125 GPa and Poissons ratio is 0.25. The modulus of rigidity of me material is

The layer at the centre of gravity of the beam as shown in the below figure, will be

A simply supported beam 'A' of length l, breadth b and depth d carries a central point load W. Another bream 'B' has the same length and breadth but its depth is doubled. The deflection of beam 'B' will be double as compared to beam 'A'.

The torsional rigidity of a shaft is expressed by the torque required to produce a twist of one radian per unit length of a shaft.

When a body is subjected to a direct tensile stress ( x) in one plane accompanied by a simple shear stress ( xy ), the minimum normal stress is

The stress developed in the material without any permanent set is called

In the below figure, curve C represents soft brass.

When a change in length takes place, the strain is known as

A beam which is fixed at one end and free at the other is called

When a body is subjected to three mutually perpendicular stresses, of equal intensity, the ratio of direct stress to the corresponding volumetric strain is known as

The factor of safety is always more than unity.

Mohr's circle is used to determine the stresses on an oblique section of a body subjected to

The proof resilience is the maximum strain energy which can be stored in a body.

The state of stress at a point in a loaded member is shown in the below figure. The magnitude of maximum shear stress is

When a body is subjected to two equal and opposite forces, acting tangentially across the resisting section, as a result of which the body tends to shear off across the section, the stress and strain induced is

A localised compressive stress at the area of contact between two members is known as

Two closely-coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is double that of spring 'B'. The stiffness of spring 'A' will be __________ that of spring 'B'.

The stiffness of a closely-coiled helical spring is __________ proportional to number of turns.

The equivalent length, of a given column with given end conditions, is the length of an equivalent column of the same material and cross-section with hinged ends, and having the value of crippling load equal to that of the given column.

A body is subjected to a direct tensile stress ( ) in one plane. The shear stress is maximum at a section inclined at __________ to the normal of the section.

The bending moment on a section is maximum where shear force is

A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum shear stress will be

The shear stress at the centre of a circular shaft under torsion is

At the neutral axis of a beam, the shear stress is

The maximum deflection of a cantilever beam of length l with a uniformly distributed load of w per unit length is (where W = wl)

The slenderness ratio is the ratio of

When two shafts of same length, one of which is hollow, transmit equal torques and have equal maximum stress, then they should have equal

According to Euler's column theory, the crippling load for a column of length (l) fixed at both ends is __________ the crippling load for a similar column hinged at both ends.

In a cantilever beam of length l subjected to a uniformly distributed load of w per unit length, the maximum deflection lies at the fixed end.

A lap joint is always in __________ shear.

The efficiency of a riveted joint is the ratio of the strength of the joint to the strength of the solid plate.

The elongation of a conical bar under its own weight is __________ that of prismatic bar of the same length.

According to Euler's column theory, the crippling load for a column of length (l) with one end fixed and the other end free is __________ the crippling load for a similar column hinged at both the ends.

The shear force diagram for a simply supported beam carrying a uniformly distributed load of w per unit length, consists of

When a cantilever beam is loaded at its free end, the maximum compressive stress shall develop at

The maximum shear stress of a beam of triangular section occurs above the neutral axis,

The Poisson's ratio for cast iron varies from

The strain energy stored in a spring, when subjected to maximum load, without suffering permanent distortion, is known as

The Rankine's theory for active earth pressure is based on the assumption that

An overhanging beam must overhang on both sides.

The resultant stress on an inclined plane which is inclined at an angle to the normal cross-section of a body which is subjected to a direct tensile stress ( ) in one plane, is

Two shafts 'A' and 'B' are made of same material. The shaft 'A' is solid and has diameter D. The shaft 'B' is hollow with outer diameter D and inner diameter D/2. The strength of hollow shaft in torsion is __________ as that of solid shaft.

The extremeties of any diameter on Mohr's circle represent

For a 25 mm hole drilled in plates, the diameter of rivet shank should be

When a thin cylindrical shell is subjected to an internal pressure, there will be

The shear force diagram fora cantilever beam of length l and carrying a gradually varying load from zero at free end and w per unit length at the fixed end is a

The polar moment of inertia of a hollow shaft of outer diameter (D) and inner diameter (d) is

In the below figure, the stress corresponding to point D is