224 + Mcqs in Steel Structure Design Page 4 McqOptions

151.	When the ratio of the moment M to axial load P is greater than L/6, the resultant of the compressive bearing pressure which acts at a distance Y from one side, is given by
A.	A
B.	B
C.	C
D.	D
Answer» C. C

Discussion

152.	Under a concentrated load, bearing stress fb in a beam, is given by (where b is the length of the bearing plate and h is the depth of the root of the fillet).
A.	A
B.	B
C.	C
D.	D
Answer» C. C

Discussion

153.	With usual notations of the letters, the shear stress fs at any point of the cross-section is given by
A.	A
B.	B
C.	C
D.	D
Answer» B. B

Discussion

154.	Effective length of a column effectively held in position and restrained in direction at both ends, is
A.	L
B.	0.67 L
C.	0.85 L
D.	1.5 L
Answer» C. 0.85 L

Discussion

155.	Rivets subjected to shear and an externally applied tensile force, should be so proportioned that
A.	A
B.	B
C.	C
D.	D
Answer» E.

Discussion

156.	In case horizontal stiffeners are not used, the distance between vertical legs of flange angles at the top and bottom of a plate girder, is known as
A.	overall depth
B.	clear depth
C.	effective depth
D.	none of these.
Answer» C. effective depth

Discussion

157.	For the economical design of a combined footing to support two equal column loads, the projections of beams in lower tier are kept such that bending moment under column is equal to
A.	bending moment at the centre of the beam
B.	half the bending moment at the centre of the beam
C.	twice the bending moment at the centre of the beam
D.	none of these.
Answer» B. half the bending moment at the centre of the beam

Discussion

158.	If the thickness of a structural member is small as compared to its length and width, it is classified as
A.	one dimensional
B.	two dimensional
C.	three dimensional
D.	none of these.
Answer» C. three dimensional

Discussion

159.	Tongue plates are provided in a steel girder at
A.	the upper flange
B.	the lower flange
C.	the upper end of the web
D.	the upper and lower ends of the web.
Answer» E.

Discussion

160.	The maximum axial load which is just sufficient to keep a column in a small deflected shape, is called
A.	crippling load
B.	buckling load
C.	critical load
D.	all the above.
Answer» E.

Discussion

161.	Bulb angles are used in
A.	column building
B.	bridge building
C.	ship building
D.	water tank building.
Answer» D. water tank building.

Discussion

162.	The strength of a riveted lap joint is equal to its
A.	shearing strength
B.	bearing strength
C.	tearing strength
D.	least of (a), (b) and (c)
Answer» E.

Discussion

163.	When a large value of radius of gyration is not required
A.	channels are placed back to back
B.	channel flanges are kept inward
C.	channel flanges are kept outward
D.	none of these.
Answer» C. channel flanges are kept outward

Discussion

164.	Design of a riveted joint is based on the assumption:
A.	Bending stress in rivets is accounted for
B.	Riveted hole is assumed to be completely filled by the rivet
C.	Stress in the plate in not uniform
D.	Friction between plates is taken into account
Answer» C. Stress in the plate in not uniform

Discussion

165.	The distance between the outer faces of flanges of a plate girder, is known as
A.	overall depth
B.	clear depth
C.	effective depth
D.	none of these.
Answer» B. clear depth

Discussion

166.	If fbt and fc are the co-existent bending tensile stress and shear stress in a member, the equivalent stress fc is
A.	A
B.	B
C.	C
D.	D
Answer» D. D

Discussion

167.	If L is the overall length of a combined footing having A as its area, d being the distance between the centre of gravity of the base and centre of the base, the larger width b is
A.	A
B.	B
C.	C
D.	D
Answer» C. C

Discussion

168.	The central deflection of a simply supported steel beam of length L with a concentrated load W at the centre, is
A.	A
B.	B
C.	C
D.	D
Answer» D. D

Discussion

169.	When a column is subjected to eccentric load having eccentricity ex, with respect to x-axis and eccentricity ey with respect to y-axis the column is subjected to moment in two directions and the equivalent axial load, is
A.	A
B.	B
C.	C
D.	D
Answer» B. B

Discussion

170.	The value of f.o.s 'm' in the formula for safe compressive stress for a column is taken as
A.	1.5
B.	1.6
C.	1.68
D.	1.88
Answer» D. 1.88

Discussion

171.	A single angle in tension is connected by one leg only. If the areas of connecting and outstanding legs are respectively a and b, net effective area of the angle, is
A.	A
B.	B
C.	C
D.	D
Answer» C. C

Discussion

172.	According to the Unwin's formula, if t is thickness of the plate in cm, the nominal diameter of the rivet, is
A.	A
B.	B
C.	C
D.	D
Answer» D. D

Discussion

173.	For columns whose slenderness ratio is upto 160, the secant formula for the determination of allowable stress, is
A.	A
B.	B
C.	C
D.	D
Answer» B. B

Discussion

174.	If M is the moment due to a couple in a bearing plate whose width is b and allowable bending stress is P, the thickness (t) of the bending plate of the column splice, is
A.	A
B.	B
C.	C
D.	D
Answer» C. C

Discussion

175.	If a pair of angles placed back to back in tension are connected by one leg of each angle, the net effective area of the section, is
A.	A
B.	B
C.	C
D.	D
Answer» E.

Discussion

176.	A column is carrying an axial load W and an eccentric load P. If A is its cross-sectional area, ex and ey are the eccentricities and Pxx and Zyy the section modulli, the equivalent axial load is obtained from the formula,
A.	A
B.	B
C.	C
D.	D
Answer» B. B

Discussion

177.	Stiffeners are used in a plate girder
A.	to reduce the compressive stress
B.	to reduce the shear stress
C.	to take the bearing stress
D.	to avoid bulking of web plate.
Answer» E.

Discussion

178.	Design of a riveted joint, is based on the assumption:
A.	Load is uniformly distributed among all the rivets
B.	Shear stress on a rivet is uniformly distributed over its gross area
C.	Bearing stress is uniform between the contact surfaces of the plate and the rivet
D.	All the above.
Answer» E.

Discussion

179.	Cold driven rivets range from
A.	6 to 10 mm in diameter
B.	10 to 16 mm in diameter
C.	12 to 22 mm in diameter
D.	22 to 32 mm in diameter
Answer» D. 22 to 32 mm in diameter

Discussion

180.	The safe working pressure for a spherical vessel 1.5 m diameter and having 1.5 cm thick wall not to exceed tensile stress 50kg/cm² , is
A.	16 kg/cm²
B.	18 kg/cm²
C.	20 kg/cm²
D.	22 kg/cm²
Answer» D. 22 kg/cm²

Discussion

181.	The slenderness ratio of a column is zero when its length
A.	is zero
B.	is equal to its radius of gyration
C.	is supported on all sides throughout its length
D.	is between the points of zero moments.
Answer» D. is between the points of zero moments.

Discussion

182.	The rivets which are heated and then driven in the field, are known
A.	power driven shop rivets
B.	power driven field rivets
C.	hand driven rivets
D.	cold driven rivets
Answer» C. hand driven rivets

Discussion

183.	When the upper column does not provide full bearing area over lower column, the column splice is provided with the following assumption
A.	bearing plate is assumed as a short beam to transmit the axial load to the lower column section
B.	axial load is assumed to be taken by flanges
C.	load transmitted from the flanges of upper column and reactions from the flanges of lower columns are equal and form a couple
D.	all the above.
Answer» E.

Discussion

184.	The maximum permissible slenderness ratio of a member carrying loads resulting from wind, is
A.	180
B.	200
C.	250
D.	300
Answer» D. 300

Discussion

185.	The beam outside a wall upto floor level above it, is known as
A.	rafter
B.	purlin
C.	spandrel beam
D.	lintel
Answer» D. lintel

Discussion

186.	With a percentage increase of carbon in steel, decreases its
A.	strength
B.	hardness
C.	brittleness
D.	ductility.
Answer» E.

Discussion

187.	Length of an outstanding leg of a vertical stiffener, may be taken equal to
A.	1/10th of clear depth of the girder plus 15 mm
B.	1/20th of clear depth of the girder plus 20 mm
C.	1/25th of clear depth of the girder plus 25 mm
D.	1/30th of clear depth of the girder plus 50 mm
Answer» D. 1/30th of clear depth of the girder plus 50 mm

Discussion

188.	When the depth of a plate girder is at least n times the depth of vertical leg of the flange angles, the girder is known as deep plate girder, if n is
A.	2
B.	4
C.	6
D.	8
Answer» E.

Discussion

189.	For a column of height L fixed in position and direction both at its top and bottom, its effective length, is
A.	1/2 √L
B.	L
C.	(1/2)*L
D.	2L
Answer» D. 2L

Discussion

190.	In rolled steel beams, shear force is mostly resisted by
A.	web only
B.	flanges only
C.	web and flanges together
D.	none of these.
Answer» B. flanges only

Discussion

191.	A column splice is used to increase
A.	length of the column
B.	strength of the column
C.	cross-sectional area of the column
D.	none of these.
Answer» B. strength of the column

Discussion

192.	Rolled steel beams are designated by Indian Standard series and its
A.	weight per metre and depth of its section
B.	depth of section and weight per metre
C.	width of flange and weight per metre
D.	weight per metre and flange width.
Answer» C. width of flange and weight per metre

Discussion

193.	For eccentrically loaded columns, the bending factor is
A.	A
B.	B
C.	C
D.	D
Answer» D. D

Discussion

194.	If d is the clear depth of a plate girder, t is the minimum required thickness of the web, C is the maximum clear distance between vertical stiffeners, the moment of inertia of a pair of stiffeners about the centre line of the web, is
A.	A
B.	B
C.	C
D.	D
Answer» B. B

Discussion

195.	If f is the maximum allowable bending stress in a tension member whose radius of gyration is r and depth is 2y, the required cross sectional area A is given by
A.	A
B.	B
C.	C
D.	D
Answer» B. B

Discussion

196.	Number of rivets required in a joint, is
A.	A
B.	B
C.	C
D.	D
Answer» E.

Discussion

197.	In a built up beam actual bending compressive stress fbc is given by (when y1 is the distance of the edge of the beam from the neutral axis).
A.	A
B.	B
C.	C
D.	D
Answer» B. B

Discussion

198.	In a grillage column footing maximum bending moment M occurs at the centre of grillage beams. Its value is (where P, L and a are axial load, length of the beam and length of the column base respectively).
A.	A
B.	B
C.	C
D.	D
Answer» D. D

Discussion

199.	A long plate girder is subjected to a maximum bending moment M in which permitted allowable bending stress is fb. The economical depth de and the thickness of the web tw, is given by
A.	A
B.	B
C.	C
D.	D
Answer» C. C

Discussion

200.	The equivalent axial load is obtained from the formula
A.	A
B.	B
C.	C
D.	D
Answer» B. B

Discussion

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When the ratio of the moment M to axial load P is greater than L/6, the resultant of the compressive bearing pressure which acts at a distance Y from one side, is given by

Under a concentrated load, bearing stress fb in a beam, is given by (where b is the length of the bearing plate and h is the depth of the root of the fillet).

With usual notations of the letters, the shear stress fs at any point of the cross-section is given by

Effective length of a column effectively held in position and restrained in direction at both ends, is

Rivets subjected to shear and an externally applied tensile force, should be so proportioned that

In case horizontal stiffeners are not used, the distance between vertical legs of flange angles at the top and bottom of a plate girder, is known as

For the economical design of a combined footing to support two equal column loads, the projections of beams in lower tier are kept such that bending moment under column is equal to

If the thickness of a structural member is small as compared to its length and width, it is classified as

Tongue plates are provided in a steel girder at

The maximum axial load which is just sufficient to keep a column in a small deflected shape, is called

Bulb angles are used in

The strength of a riveted lap joint is equal to its

When a large value of radius of gyration is not required

Design of a riveted joint is based on the assumption:

The distance between the outer faces of flanges of a plate girder, is known as

If fbt and fc are the co-existent bending tensile stress and shear stress in a member, the equivalent stress fc is

If L is the overall length of a combined footing having A as its area, d being the distance between the centre of gravity of the base and centre of the base, the larger width b is

The central deflection of a simply supported steel beam of length L with a concentrated load W at the centre, is

When a column is subjected to eccentric load having eccentricity ex, with respect to x-axis and eccentricity ey with respect to y-axis the column is subjected to moment in two directions and the equivalent axial load, is

The value of f.o.s 'm' in the formula for safe compressive stress for a column is taken as

A single angle in tension is connected by one leg only. If the areas of connecting and outstanding legs are respectively a and b, net effective area of the angle, is

According to the Unwin's formula, if t is thickness of the plate in cm, the nominal diameter of the rivet, is

For columns whose slenderness ratio is upto 160, the secant formula for the determination of allowable stress, is

If M is the moment due to a couple in a bearing plate whose width is b and allowable bending stress is P, the thickness (t) of the bending plate of the column splice, is

If a pair of angles placed back to back in tension are connected by one leg of each angle, the net effective area of the section, is

A column is carrying an axial load W and an eccentric load P. If A is its cross-sectional area, ex and ey are the eccentricities and Pxx and Zyy the section modulli, the equivalent axial load is obtained from the formula,

Stiffeners are used in a plate girder

Design of a riveted joint, is based on the assumption:

Cold driven rivets range from

The safe working pressure for a spherical vessel 1.5 m diameter and having 1.5 cm thick wall not to exceed tensile stress 50kg/cm² , is

The slenderness ratio of a column is zero when its length

The rivets which are heated and then driven in the field, are known

When the upper column does not provide full bearing area over lower column, the column splice is provided with the following assumption

The maximum permissible slenderness ratio of a member carrying loads resulting from wind, is

The beam outside a wall upto floor level above it, is known as

With a percentage increase of carbon in steel, decreases its

Length of an outstanding leg of a vertical stiffener, may be taken equal to

When the depth of a plate girder is at least n times the depth of vertical leg of the flange angles, the girder is known as deep plate girder, if n is

For a column of height L fixed in position and direction both at its top and bottom, its effective length, is

In rolled steel beams, shear force is mostly resisted by

A column splice is used to increase

Rolled steel beams are designated by Indian Standard series and its

For eccentrically loaded columns, the bending factor is

If d is the clear depth of a plate girder, t is the minimum required thickness of the web, C is the maximum clear distance between vertical stiffeners, the moment of inertia of a pair of stiffeners about the centre line of the web, is

If f is the maximum allowable bending stress in a tension member whose radius of gyration is r and depth is 2y, the required cross sectional area A is given by

Number of rivets required in a joint, is

In a built up beam actual bending compressive stress fbc is given by (when y1 is the distance of the edge of the beam from the neutral axis).

In a grillage column footing maximum bending moment M occurs at the centre of grillage beams. Its value is (where P, L and a are axial load, length of the beam and length of the column base respectively).

A long plate girder is subjected to a maximum bending moment M in which permitted allowable bending stress is fb. The economical depth de and the thickness of the web tw, is given by

The equivalent axial load is obtained from the formula