4791 + Mcqs in Mechanical Engineering Page 66 McqOptions

3251.	Two shafts 'A' and 'B' have the same material. The shaft 'A' is solid of diameter 100 mm. The shaft 'B' is hollow with outer diameter 100 mm and inner diameter 50 mm. The torque transmitted by shaft 'B' is __________ as that of shaft 'A'.
A.	1/6
B.	1/8
C.	1/4
D.	15/16
Answer» E.

Discussion

3252.	The direct stress, across a principal plane, is known as principal stress.
A.	Yes
B.	No
Answer» B. No

Discussion

3253.	On one side of a neutral axis of a beam, there is a tensile stress and on the other side of the beam there is a compressive stress.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

3254.	When a body is subjected to a direct tensile stress ( ), the maximum normal stress is equal to the direct tensile stress.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

3255.	If there is a fall in the temperature of a composite body, then a member having greater coefficient of linear expansion will be subjected to compressive stress.
A.	True
B.	False
Answer» C.

Discussion

3256.	The hoop stress in a thick cylindrical shell is maximum at the inner radius.
A.	True
B.	False
Answer» B. False

Discussion

3257.	The extension of a circular bar tapering uniformly from diameter d1 at one end to diameter d2 at the other end, and subjected to an axial pull of P is given by
A.	<img src="/_files/images/mechanical-engineering/strength-of-materials/85-27-1.png">
B.	<img src="/_files/images/mechanical-engineering/strength-of-materials/85-27-2.png">
C.	<img src="/_files/images/mechanical-engineering/strength-of-materials/85-27-3.png">
D.	<img src="/_files/images/mechanical-engineering/strength-of-materials/85-27-4.png">
Answer» D. <img src="/_files/images/mechanical-engineering/strength-of-materials/85-27-4.png">

Discussion

3258.	The ratio of bulk modulus to Young's modulus for a Poisson's ratio of 0.25 will be
A.	1/3
B.	2/3
C.	1
D.	3/2
Answer» C. 1

Discussion

3259.	The bending moment diagram for a cantilever beam of length l and carrying a gradually varying load from zero at the free end and w per unit length at the fixed end is a parabolic curve.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

3260.	In a riveted joint, when the rivets in the various rows are opposite to each other, the joint is said to be
A.	chain riveted
B.	zig-zag riveted
C.	diamond riveted
D.	none of these
Answer» B. zig-zag riveted

Discussion

3261.	A column is said to be a short column, when
A.	its length is very small
B.	its cross-sectional area is small
C.	the ratio of its length to the least radhis of gyration is less than 80.
D.	the ratio of its length to the least radius of gyration is more than 80.
Answer» D. the ratio of its length to the least radius of gyration is more than 80.

Discussion

3262.	The load required to produce a unit deflection in a spring is called
A.	flexural rigidity
B.	torsional rigidity
C.	spring stiffness
D.	Young's modulus
Answer» D. Young's modulus

Discussion

3263.	According to Euler's column theory, the crippling load for a column length (l) hinged at both ends, is
A.	<img src="/_files/images/mechanical-engineering/strength-of-materials/121-406-1.png">
B.	<img src="/_files/images/mechanical-engineering/strength-of-materials/121-406-2.png">
C.	<img src="/_files/images/mechanical-engineering/strength-of-materials/121-406-3.png">
D.	<img src="/_files/images/mechanical-engineering/strength-of-materials/121-406-4.png">
Answer» B. <img src="/_files/images/mechanical-engineering/strength-of-materials/121-406-2.png">

Discussion

3264.	The radius of the Mohr 's circle in the given figure is equal to
A.	sum of two principal stresses
B.	difference of two principal stresses
C.	half the sum of two principal stresses
D.	half the difference of two principal stresses
Answer» E.

Discussion

3265.	In a thick cylindrical shell subjected to an internal pressure (p), the radial stress across the thickness of the 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 arid zero at the outer surface
Answer» E.

Discussion

3266.	A reinforced cement concrete beam is considered to be made of
A.	homogeneous material
B.	hetrogeneous material
C.	composite material
D.	isotropic material
Answer» C. composite material

Discussion

3267.	When a body is subjected to a direct tensile stress ( ) in one plane, the maximum shear stress is __________ the maximum normal stress.
A.	equal to
B.	one-half
C.	two-third
D.	twice
Answer» C. two-third

Discussion

3268.	For the beam shown in the below figure, the shear force diagram between A and B is
A.	a horizontal line
B.	a vertical line
C.	an inclined line
D.	a parabolic curve
Answer» E.

Discussion

3269.	In a beam subjected to pure bending, the intensity of stress in any fibre is __________ the distance of the fibre from the neutral axis.
A.	equal to
B.	less than
C.	more than
D.	directly proportional to
Answer» E.

Discussion

3270.	According to Euler's column theory, the crippling load of a column is given by p = 2 EI/Cl2. In the Euler's formula, the value of C for a column with one end fixed and the other end free, is
A.	1/2
B.	1
C.	2
D.	4
Answer» E.

Discussion

3271.	The relation between Young's modulus (E) and bulk modulus (K) is given by
A.	<img src="/_files/images/mechanical-engineering/strength-of-materials/87-59-1.png">
B.	<img src="/_files/images/mechanical-engineering/strength-of-materials/87-59-2.png">
C.	<img src="/_files/images/mechanical-engineering/strength-of-materials/87-59-3.png">
D.	<img src="/_files/images/mechanical-engineering/strength-of-materials/87-59-4.png">
Answer» E.

Discussion

3272.	A simply supported beam is one which is supported on more than two supports.
A.	True
B.	False
Answer» C.

Discussion

3273.	For long columns, thevalue of buckling load is __________ crushing load.
A.	equal to
B.	less than
C.	more than
Answer» C. more than

Discussion

3274.	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 minimum normal stress will be
A.	400 MPa
B.	500 MPa
C.	900 MPa
D.	1400 MPa
Answer» B. 500 MPa

Discussion

3275.	The given figure shows the Mohr's circle of stress for two unequal and like principal stresses ( x and y) acting at a body across two mutually perpendicular planes. The resultant stress is given by
A.	<i>OC</i>
B.	<i>OP</i>
C.	<i>OQ</i>
D.	<i>PQ</i>
Answer» C. <i>OQ</i>

Discussion

3276.	When a beam is subjected to a bending moment, the strain in a layer is __________ the distance from the neutral axis.
A.	equal to
B.	directly proportional to
C.	inversely proportional to
D.	independent of
Answer» C. inversely proportional to

Discussion

3277.	When one plate overlaps the other and the two plates are riveted together with two rows of rivets, the joint is known as
A.	single riveted lap joint
B.	double riveted lap joint
C.	double riveted single cover butt joint
D.	double riveted double cover butt joint
Answer» C. double riveted single cover butt joint

Discussion

3278.	The thermal or temperature stress is a function of
A.	increase in temperature
B.	modulus of elasticity
C.	coefficient of linear expansion
D.	all of these
Answer» E.

Discussion

3279.	The maximum deflection of a fixed beam of length l carrying a central point load W is
A.	<img src="/_files/images/mechanical-engineering/strength-of-materials/106-259-1.png">
B.	<img src="/_files/images/mechanical-engineering/strength-of-materials/106-259-2.png">
C.	<img src="/_files/images/mechanical-engineering/strength-of-materials/106-259-3.png">
D.	<img src="/_files/images/mechanical-engineering/strength-of-materials/106-259-4.png">
Answer» D. <img src="/_files/images/mechanical-engineering/strength-of-materials/106-259-4.png">

Discussion

3280.	The breaking stress is __________ the ultimate stress.
A.	equal to
B.	less than
C.	greater than
Answer» C. greater than

Discussion

3281.	A bolt is made to pass through a tube and both of them are tightly fitted with the help of washers and nuts. If the nut is tightened, then
A.	bolt arid tube are under tension
B.	bolt and tube are under compression
C.	bolt is under compression and tube is under tension
D.	bolt is Under tension and tube is under compression
Answer» E.

Discussion

3282.	The ductility of a material __________ with the increase in percentage reduction in area of a specimen under tensile test.
A.	increases
B.	decreases
C.	remains same
Answer» B. decreases

Discussion

3283.	The rivets are made from ductile material.
A.	Yes
B.	No
Answer» B. No

Discussion

3284.	The rectangular beam 'A' has length l, width b and depth d. Another beam 'B' has the same length and width but depth is double that of 'A'. The elastic strength of beam B will be __________ as compared to beam A.
A.	same
B.	double
C.	four times
D.	six times
Answer» D. six times

Discussion

3285.	When a rectangular beam is loaded transversely, the zero stress is developed on the neutral axis.
A.	True
B.	False
Answer» B. False

Discussion

3286.	The ratio of change in volume to the original volume is called
A.	linear strain
B.	lateral strain
C.	volumetric strain
D.	Poisson's ratio
Answer» D. Poisson's ratio

Discussion

3287.	In a beam where shear force changes sign, the bending moment will be
A.	zero
B.	minimum
C.	maximum
D.	infinity
Answer» D. infinity

Discussion

3288.	Rivets are generally specified by
A.	thickness of plates to be joined
B.	overall length
C.	shank diameter
D.	diameter of head
Answer» D. diameter of head

Discussion

3289.	Principle plane is a plane on which the shear stress is
A.	zero
B.	minimum
C.	maximum
Answer» B. minimum

Discussion

3290.	Compression members always tend to buckle in the direction of the
A.	axis of load
B.	perpendicular to the axis of load
C.	minimum cross section
D.	least radius of gyration
Answer» E.

Discussion

3291.	The maximum tangential stress in a thick cylindrical shell is always __________ the internal pressure acting on the shell.
A.	equal to
B.	less than
C.	greater than
Answer» D.

Discussion

3292.	When a shaft is subjected to a twisting moment, every cross-section of the shaft will be under
A.	tensile stress
B.	compressive stress
C.	shear stress
D.	bending stress
Answer» D. bending stress

Discussion

3293.	The shear force and bending moment are zero at the free end of a cantilever beam, if it carries a
A.	point load at the free end
B.	point load at the middle of its length
C.	uniformly distributed load over the whole length
D.	none of the above
Answer» D. none of the above

Discussion

3294.	A rod is enclosed centrally in a tube and the assembly is tightened by rigid washers. If the assembly is subjected to a compressive load, then
A.	rod is under compression
B.	tube is under compression
C.	both rod and tube are under compression
D.	tube is under tension and rod is under compression
Answer» D. tube is under tension and rod is under compression

Discussion

3295.	The centre to centre distance, between two consecutive rivets in a row, is called
A.	margin
B.	pitch
C.	back pitch
D.	diagonal pitch
Answer» C. back pitch

Discussion

3296.	A simply supported beam 'A' of length l, breadth b, and depth d carries a central point load W. Another beam 'B' has the same length and depth but its breadth is doubled. The deflection of beam 'B' will be __________ as compared to beam 'A'.
A.	one-fourth
B.	one-half
C.	double
D.	four times
Answer» C. double

Discussion

3297.	The critical neutral axis of a reinforced cement concrete beam is based on the principle that the neutral axis is situated at the centre of gravity of a given section.
A.	True
B.	False
Answer» B. False

Discussion

3298.	The crown of the fire box is made hemispherical in order to resist intense heat in the fire box.
A.	True
B.	False
Answer» B. False

Discussion

3299.	For maximum discharge through a chimney, the condition is that height of hot gas column producing the draught should be
A.	one-half the height of chimney
B.	equal to the height of chimney
C.	two times the height of chimney
D.	four times the height of chimney
Answer» C. two times the height of chimney

Discussion

3300.	A device used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit, is called
A.	blow off cock
B.	stop valve
C.	superheater
D.	none of these
Answer» E.

Discussion

Explore topic-wise MCQs in Engineering.

Two shafts 'A' and 'B' have the same material. The shaft 'A' is solid of diameter 100 mm. The shaft 'B' is hollow with outer diameter 100 mm and inner diameter 50 mm. The torque transmitted by shaft 'B' is __________ as that of shaft 'A'.

The direct stress, across a principal plane, is known as principal stress.

On one side of a neutral axis of a beam, there is a tensile stress and on the other side of the beam there is a compressive stress.

When a body is subjected to a direct tensile stress ( ), the maximum normal stress is equal to the direct tensile stress.

If there is a fall in the temperature of a composite body, then a member having greater coefficient of linear expansion will be subjected to compressive stress.

The hoop stress in a thick cylindrical shell is maximum at the inner radius.

The extension of a circular bar tapering uniformly from diameter d1 at one end to diameter d2 at the other end, and subjected to an axial pull of P is given by

The ratio of bulk modulus to Young's modulus for a Poisson's ratio of 0.25 will be

The bending moment diagram for a cantilever beam of length l and carrying a gradually varying load from zero at the free end and w per unit length at the fixed end is a parabolic curve.

In a riveted joint, when the rivets in the various rows are opposite to each other, the joint is said to be

A column is said to be a short column, when

The load required to produce a unit deflection in a spring is called

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

The radius of the Mohr 's circle in the given figure is equal to

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

A reinforced cement concrete beam is considered to be made of

When a body is subjected to a direct tensile stress ( ) in one plane, the maximum shear stress is __________ the maximum normal stress.

For the beam shown in the below figure, the shear force diagram between A and B is

In a beam subjected to pure bending, the intensity of stress in any fibre is __________ the distance of the fibre from the neutral axis.

According to Euler's column theory, the crippling load of a column is given by p = 2 EI/Cl2. In the Euler's formula, the value of C for a column with one end fixed and the other end free, is

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

A simply supported beam is one which is supported on more than two supports.

For long columns, thevalue of buckling load is __________ crushing load.

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 minimum normal stress will be

The given figure shows the Mohr's circle of stress for two unequal and like principal stresses ( x and y) acting at a body across two mutually perpendicular planes. The resultant stress is given by

When a beam is subjected to a bending moment, the strain in a layer is __________ the distance from the neutral axis.

When one plate overlaps the other and the two plates are riveted together with two rows of rivets, the joint is known as

The thermal or temperature stress is a function of

The maximum deflection of a fixed beam of length l carrying a central point load W is

The breaking stress is __________ the ultimate stress.

A bolt is made to pass through a tube and both of them are tightly fitted with the help of washers and nuts. If the nut is tightened, then

The ductility of a material __________ with the increase in percentage reduction in area of a specimen under tensile test.

The rivets are made from ductile material.

The rectangular beam 'A' has length l, width b and depth d. Another beam 'B' has the same length and width but depth is double that of 'A'. The elastic strength of beam B will be __________ as compared to beam A.

When a rectangular beam is loaded transversely, the zero stress is developed on the neutral axis.

The ratio of change in volume to the original volume is called

In a beam where shear force changes sign, the bending moment will be

Rivets are generally specified by

Principle plane is a plane on which the shear stress is

Compression members always tend to buckle in the direction of the

The maximum tangential stress in a thick cylindrical shell is always __________ the internal pressure acting on the shell.

When a shaft is subjected to a twisting moment, every cross-section of the shaft will be under

The shear force and bending moment are zero at the free end of a cantilever beam, if it carries a

A rod is enclosed centrally in a tube and the assembly is tightened by rigid washers. If the assembly is subjected to a compressive load, then

The centre to centre distance, between two consecutive rivets in a row, is called

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

The critical neutral axis of a reinforced cement concrete beam is based on the principle that the neutral axis is situated at the centre of gravity of a given section.

The crown of the fire box is made hemispherical in order to resist intense heat in the fire box.

For maximum discharge through a chimney, the condition is that height of hot gas column producing the draught should be

A device used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit, is called