4791 + Mcqs in Mechanical Engineering Page 65 McqOptions

3201.	A beam of uniform strength has
A.	same cross-section throughout the beam
B.	same bending stress at every section
C.	same bending moment at every section
D.	same shear stress at every section
Answer» C. same bending moment at every section

Discussion

3202.	The shear force of a simply supported beam carrying a central point load changes sign at its midpoint.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

3203.	In a simple bending theory, one of the assumption is that the material of the beam is isotropic. This assumption means that the
A.	normal stress remains constant in all directions
B.	normal stress varies linearly in the material
C.	elastic constants are same in all the directions
D.	elastic constants varies linearly in the material
Answer» D. elastic constants varies linearly in the material

Discussion

3204.	The point of contraflexure occurs in
A.	cantilever beams
B.	simply supported beams
C.	overhanging beams
D.	fixed beams
Answer» D. fixed beams

Discussion

3205.	A welded joint as compared to a riveted joint has __________ strength.
A.	same
B.	less
C.	more
Answer» D.

Discussion

3206.	In Mohr's circle, the centre of circle from Y-axis is taken as
A.	<img src="/_files/images/mechanical-engineering/strength-of-materials/92-109-1.png">
B.	<img src="/_files/images/mechanical-engineering/strength-of-materials/92-109-2.png">
C.	<img src="/_files/images/mechanical-engineering/strength-of-materials/92-108-1.png">
D.	<img src="/_files/images/mechanical-engineering/strength-of-materials/92-108-2.png">
Answer» C. <img src="/_files/images/mechanical-engineering/strength-of-materials/92-108-1.png">

Discussion

3207.	A beam of uniform strength may be obtained by
A.	keeping the width uniform and varying the depth
B.	keeping the depth uniform and varying the width
C.	varying the width and depth both
D.	any one of the above
Answer» E.

Discussion

3208.	The total strain energy stored in a body is termed as
A.	resilience
B.	proofresilience
C.	impact energy
D.	modulus of resilience
Answer» B. proofresilience

Discussion

3209.	Modulus of resilience is the proof resilience per unit volume of a material.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

3210.	A simply supported beam 'A' of length l, breadth b and depth d carries a central load W. Another beam 'B' of the same dimensions carries a central load equal to 2 W. The deflection of beam 'B' will be __________ as that of beam 'A'.
A.	one-fourth
B.	one-half
C.	double
D.	four times
Answer» D. four times

Discussion

3211.	In the below figure, the point E represents the maximum stress.
A.	True
B.	False
Answer» C.

Discussion

3212.	The ratio of the largest load in a test to the original cross-sectional area of the test piece is called
A.	elastic limit
B.	yield stress
C.	ultimate stress
D.	breaking stress
Answer» D. breaking stress

Discussion

3213.	The relation between Young's modulus (E), shear modulus (C) and bulk modulus (K) is given by
A.	<img src="/_files/images/mechanical-engineering/strength-of-materials/88-64-1.png">
B.	<img src="/_files/images/mechanical-engineering/strength-of-materials/88-64-2.png">
C.	<img src="/_files/images/mechanical-engineering/strength-of-materials/88-64-3.png">
D.	<img src="/_files/images/mechanical-engineering/strength-of-materials/88-64-4.png">
Answer» D. <img src="/_files/images/mechanical-engineering/strength-of-materials/88-64-4.png">

Discussion

3214.	When a bar of length l and diameter d is rigidly fixed at the upper end and hanging freely, then the total elongation produced in the bar due to its own weight is (where w = Weight per unit volume of the bar)
A.	<img src="/_files/images/mechanical-engineering/strength-of-materials/84-21-1.png">
B.	<img src="/_files/images/mechanical-engineering/strength-of-materials/84-21-2.png">
C.	<img src="/_files/images/mechanical-engineering/strength-of-materials/84-21-3.png">
D.	<img src="/_files/images/mechanical-engineering/strength-of-materials/84-21-4.png">
Answer» C. <img src="/_files/images/mechanical-engineering/strength-of-materials/84-21-3.png">

Discussion

3215.	In watches, the spring is used to absorb shocks and vibrations.
A.	Yes
B.	No
Answer» C.

Discussion

3216.	The polar moment of inertia of a solid circular shaft of diameter (D) is
A.	<img src="/_files/images/mechanical-engineering/strength-of-materials/109-277-1.png">
B.	<img src="/_files/images/mechanical-engineering/strength-of-materials/109-277-2.png">
C.	<img src="/_files/images/mechanical-engineering/strength-of-materials/109-277-3.png">
D.	<img src="/_files/images/mechanical-engineering/strength-of-materials/109-277-4.png">
Answer» D. <img src="/_files/images/mechanical-engineering/strength-of-materials/109-277-4.png">

Discussion

3217.	The deformation of the bar per unit length in the direction of the force is known as
A.	linear strain
B.	lateral strain
C.	volumetric strain
D.	shear strain
Answer» B. lateral strain

Discussion

3218.	The springs in brakes and clutches are used to
A.	to apply forces
B.	to measure forces
C.	to store strain energy
D.	to absorb shocks
Answer» B. to measure forces

Discussion

3219.	When a body is subjected to bi-axial stress i.e. direct stresses ( x) and ( y) in two mutually perpendicular planes accompanied by a simple shear stress ( xy), then maximum shear stress is
A.	<img src="/_files/images/mechanical-engineering/strength-of-materials/91-94-1.png">
B.	<img src="/_files/images/mechanical-engineering/strength-of-materials/91-94-2.png">
C.	<img src="/_files/images/mechanical-engineering/strength-of-materials/91-94-3.png">
D.	<img src="/_files/images/mechanical-engineering/strength-of-materials/91-94-4.png">
Answer» B. <img src="/_files/images/mechanical-engineering/strength-of-materials/91-94-2.png">

Discussion

3220.	The maximum deflection of a fixed beam carrying a central point load lies at
A.	fixed ends
B.	centre of beam
C.	<i>l</i>
D.	/3 from fixed ends
E.	none of these
Answer» C. <i>l</i>

Discussion

3221.	When a circular bar tapering uniformly from diameter d1, at one end to diameter d2 at the other end, is subjected to an increase in temperature (t), then the thermal stress induced is (where = Coefficient of linear expansion, and E = Modulus of elasticity for the bar material)
A.	<img src="/_files/images/mechanical-engineering/strength-of-materials/86-43-1.png">
B.	<img src="/_files/images/mechanical-engineering/strength-of-materials/86-43-2.png">
C.	<img src="/_files/images/mechanical-engineering/strength-of-materials/86-43-3.png">
D.	<img src="/_files/images/mechanical-engineering/strength-of-materials/86-43-4.png">
Answer» B. <img src="/_files/images/mechanical-engineering/strength-of-materials/86-43-2.png">

Discussion

3222.	Parallel fillet welds are designed for bending strength.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

3223.	Two bars of different materials and same size are subjected to the same tensile force. If the bars have unit elongation in the ratio of 2:5, then the ratio of modulus of elasticity of the two materials will be
A.	2:5
B.	5:2
C.	4:3
D.	3:4
Answer» C. 4:3

Discussion

3224.	When a bar of length l, width b and thickness t is subjected to a pull of P, its
A.	length, width and thickness increases
B.	length, width and thickness decreases
C.	length increases, width and thickness decreases
D.	length decreases, width and thickness increases
Answer» D. length decreases, width and thickness increases

Discussion

3225.	If the modulus of elasticity of a material is twice its modulus of rigidity, then the Poisson's ratio of the material is equal to zero.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

3226.	A beam of T-section is subjected to a shear force of F. The maximum shear force will occur at the
A.	top of the section
B.	bottom of the section
C.	neutral axis of the section
D.	junction of web and flange
Answer» D. junction of web and flange

Discussion

3227.	When there is no increase or decrease in shear force between two points, it indicates that there is no change in the bending moment between these points.
A.	True
B.	False
Answer» C.

Discussion

3228.	A thin cylindrical shell of diameter (d), length (l) and thickness (t) is subjected to an internal pressure (p). The ratio of longitudinal strain to hoop strain is
A.	<img src="/_files/images/mechanical-engineering/strength-of-materials/118-376-1.png">
B.	<img src="/_files/images/mechanical-engineering/strength-of-materials/118-376-2.png">
C.	<img src="/_files/images/mechanical-engineering/strength-of-materials/118-376-3.png">
D.	<img src="/_files/images/mechanical-engineering/strength-of-materials/118-376-4.png">
Answer» B. <img src="/_files/images/mechanical-engineering/strength-of-materials/118-376-2.png">

Discussion

3229.	A column that fails due to direct stress, is called
A.	short column
B.	long column
C.	weak column
D.	medium column
Answer» B. long column

Discussion

3230.	In order to avoid sliding of masonry dam, the force of friction between the dam and soil should be at least __________ the total water pressure per metre length.
A.	equal to
B.	1.5 times
C.	double
D.	2.5 times
Answer» C. double

Discussion

3231.	A simply supported beam of length l is loaded with a uniformly distributed load of w per unit length. The maximum deflection is and lies at the centre of the beam.
A.	True
B.	False
Answer» B. False

Discussion

3232.	The bending moment diagram for a simply supported beam carrying a uniformly distributed load of w per unit length, will be
A.	a horizontal line
B.	a vertical line
C.	an inclined line
D.	a parabolic curve
Answer» E.

Discussion

3233.	The bending moment at the centre of a simply supported beam with a gradually varying load from zero at both ends to w per metre at the centre is wl/4.
A.	Yes
B.	No
Answer» C.

Discussion

3234.	The thermal stress __________ upon the cross-sectional area of the bar.
A.	depends
B.	does not depend
Answer» C.

Discussion

3235.	A double strap butt joint with equal straps is
A.	always in single shear
B.	always in double shear
C.	either in single shear or double shear
D.	none of these
Answer» C. either in single shear or double shear

Discussion

3236.	A bar of copper and steel form a composite system, which is heated to a temperature of 40 C. The stress induced in the copper bar will be
A.	tensile
B.	compressive
C.	shear
D.	zero
Answer» C. shear

Discussion

3237.	Two closely-coiled helical springs 'A' and 'B' of the same matenal, same number of turns and made from same wire are subjected to an axial load W. The mean diameter of spring 'A' is double the mean diameter of spring 'B'. The ratio of deflections in spring 'B' to spring 'A' will be
A.	1/8
B.	1/4
C.	2
D.	4
Answer» B. 1/4

Discussion

3238.	When a body is subjected to bi-axial stress i.e. direct stresses ( x) and ( y) in two mutually perpendicular planes accompanied by a simple shear stress ( xy), then minimum normal stress is
A.	<img src="/_files/images/mechanical-engineering/strength-of-materials/91-92-1.png">
B.	<img src="/_files/images/mechanical-engineering/strength-of-materials/91-92-2.png">
C.	<img src="/_files/images/mechanical-engineering/strength-of-materials/91-92-3.png">
D.	<img src="/_files/images/mechanical-engineering/strength-of-materials/91-92-4.png">
Answer» C. <img src="/_files/images/mechanical-engineering/strength-of-materials/91-92-3.png">

Discussion

3239.	A column with maximum equivalent length has
A.	both ends hinged
B.	both ends fixed
C.	one end fixed and the other end hinged
D.	one end fixed and the other end free
Answer» E.

Discussion

3240.	The product of the tangential force acting on the shaft and its distance from the axis of the shaft (i.e. radius of shaft) is known as
A.	bending moment
B.	twisting moment
C.	torsional rigidity
D.	flexural rigidity
Answer» C. torsional rigidity

Discussion

3241.	In the below figure, the point C represents
A.	elastic limit
B.	upper yield point
C.	lower yield point
D.	breaking point
Answer» D. breaking point

Discussion

3242.	When a rectangular bar of length l, breadth b and thickness t is subjected to an axial pull of P, then linear strain ( ) is given by (where E = Modulus of elasticity)
A.	<img src="/_files/images/mechanical-engineering/strength-of-materials/87-56-1.png">
B.	<img src="/_files/images/mechanical-engineering/strength-of-materials/87-56-2.png">
C.	<img src="/_files/images/mechanical-engineering/strength-of-materials/87-56-3.png">
D.	<img src="/_files/images/mechanical-engineering/strength-of-materials/87-56-4.png">
Answer» B. <img src="/_files/images/mechanical-engineering/strength-of-materials/87-56-2.png">

Discussion

3243.	If the section modulus of a beam is increased, the bending stress in the beam will
A.	not change
B.	increase
C.	decrease
Answer» D.

Discussion

3244.	When a body is subjected to bi-axial stress i.e. direct stresses ( x) and ( y) in two mutually perpendicular planes accompanied by a simple shear stress ( xy), then maximum normal stress is
A.	<img src="/_files/images/mechanical-engineering/strength-of-materials/91-92-1.png">
B.	<img src="/_files/images/mechanical-engineering/strength-of-materials/91-92-2.png">
C.	<img src="/_files/images/mechanical-engineering/strength-of-materials/91-92-3.png">
D.	<img src="/_files/images/mechanical-engineering/strength-of-materials/91-92-4.png">
Answer» B. <img src="/_files/images/mechanical-engineering/strength-of-materials/91-92-2.png">

Discussion

3245.	In a thick cylindrical shell subjected to an internal pressure (p), the tangential stress across the thickness of a cylinder is
A.	maximum at the outer surface and minimum at the inner surface
B.	maximum at the inner surface and minimum at the outer surface
C.	maximum at the outer surface and zero at the inner surface
D.	maximum at the inner surface and zero at the outer surface
Answer» C. maximum at the outer surface and zero at the inner surface

Discussion

3246.	A beam encastered at both the ends is called
A.	simply supported beam
B.	fixed beam
C.	cantilever beam
D.	continuous beam
Answer» C. cantilever beam

Discussion

3247.	A body is subjected to a direct tensile stress of 300 MPa in one plane accompanied by a simple shear stress of 200 MPa. The maximum shear stress will be
A.	-100 MPa
B.	250 MPa
C.	300 MPa
D.	400 MPa
Answer» C. 300 MPa

Discussion

3248.	At the neutral axis of a beam
A.	the layers are subjected to maximum bending stress
B.	the layers are subjected to minimum bending stress
C.	the layers are subjected to compression
D.	the layers do not undergo any strain
Answer» E.

Discussion

3249.	In a thick cylindrical shell subjected to an internal pressure (p), the tangential stress is always a tensile stress where as the radial stress is a compressive stress
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

3250.	The line of intersection of the neutral layer with any normal cross-section of the beam is called neutral axis.
A.	True
B.	False
Answer» B. False

Discussion

Explore topic-wise MCQs in Engineering.

A beam of uniform strength has

The shear force of a simply supported beam carrying a central point load changes sign at its midpoint.

In a simple bending theory, one of the assumption is that the material of the beam is isotropic. This assumption means that the

The point of contraflexure occurs in

A welded joint as compared to a riveted joint has __________ strength.

In Mohr's circle, the centre of circle from Y-axis is taken as

A beam of uniform strength may be obtained by

The total strain energy stored in a body is termed as

Modulus of resilience is the proof resilience per unit volume of a material.

A simply supported beam 'A' of length l, breadth b and depth d carries a central load W. Another beam 'B' of the same dimensions carries a central load equal to 2 W. The deflection of beam 'B' will be __________ as that of beam 'A'.

In the below figure, the point E represents the maximum stress.

The ratio of the largest load in a test to the original cross-sectional area of the test piece is called

The relation between Young's modulus (E), shear modulus (C) and bulk modulus (K) is given by

When a bar of length l and diameter d is rigidly fixed at the upper end and hanging freely, then the total elongation produced in the bar due to its own weight is (where w = Weight per unit volume of the bar)

In watches, the spring is used to absorb shocks and vibrations.

The polar moment of inertia of a solid circular shaft of diameter (D) is

The deformation of the bar per unit length in the direction of the force is known as

The springs in brakes and clutches are used to

When a body is subjected to bi-axial stress i.e. direct stresses ( x) and ( y) in two mutually perpendicular planes accompanied by a simple shear stress ( xy), then maximum shear stress is

The maximum deflection of a fixed beam carrying a central point load lies at

When a circular bar tapering uniformly from diameter d1, at one end to diameter d2 at the other end, is subjected to an increase in temperature (t), then the thermal stress induced is (where = Coefficient of linear expansion, and E = Modulus of elasticity for the bar material)

Parallel fillet welds are designed for bending strength.

Two bars of different materials and same size are subjected to the same tensile force. If the bars have unit elongation in the ratio of 2:5, then the ratio of modulus of elasticity of the two materials will be

When a bar of length l, width b and thickness t is subjected to a pull of P, its

If the modulus of elasticity of a material is twice its modulus of rigidity, then the Poisson's ratio of the material is equal to zero.

A beam of T-section is subjected to a shear force of F. The maximum shear force will occur at the

When there is no increase or decrease in shear force between two points, it indicates that there is no change in the bending moment between these points.

A thin cylindrical shell of diameter (d), length (l) and thickness (t) is subjected to an internal pressure (p). The ratio of longitudinal strain to hoop strain is

A column that fails due to direct stress, is called

In order to avoid sliding of masonry dam, the force of friction between the dam and soil should be at least __________ the total water pressure per metre length.

A simply supported beam of length l is loaded with a uniformly distributed load of w per unit length. The maximum deflection is and lies at the centre of the beam.

The bending moment diagram for a simply supported beam carrying a uniformly distributed load of w per unit length, will be

The bending moment at the centre of a simply supported beam with a gradually varying load from zero at both ends to w per metre at the centre is wl/4.

The thermal stress __________ upon the cross-sectional area of the bar.

A double strap butt joint with equal straps is

A bar of copper and steel form a composite system, which is heated to a temperature of 40 C. The stress induced in the copper bar will be

Two closely-coiled helical springs 'A' and 'B' of the same matenal, same number of turns and made from same wire are subjected to an axial load W. The mean diameter of spring 'A' is double the mean diameter of spring 'B'. The ratio of deflections in spring 'B' to spring 'A' will be

When a body is subjected to bi-axial stress i.e. direct stresses ( x) and ( y) in two mutually perpendicular planes accompanied by a simple shear stress ( xy), then minimum normal stress is

A column with maximum equivalent length has

The product of the tangential force acting on the shaft and its distance from the axis of the shaft (i.e. radius of shaft) is known as

In the below figure, the point C represents

When a rectangular bar of length l, breadth b and thickness t is subjected to an axial pull of P, then linear strain ( ) is given by (where E = Modulus of elasticity)

If the section modulus of a beam is increased, the bending stress in the beam will

When a body is subjected to bi-axial stress i.e. direct stresses ( x) and ( y) in two mutually perpendicular planes accompanied by a simple shear stress ( xy), then maximum normal stress is

In a thick cylindrical shell subjected to an internal pressure (p), the tangential stress across the thickness of a cylinder is

A beam encastered at both the ends is called

A body is subjected to a direct tensile stress of 300 MPa in one plane accompanied by a simple shear stress of 200 MPa. The maximum shear stress will be

At the neutral axis of a beam

In a thick cylindrical shell subjected to an internal pressure (p), the tangential stress is always a tensile stress where as the radial stress is a compressive stress

The line of intersection of the neutral layer with any normal cross-section of the beam is called neutral axis.