Free Model Online Design of Steel Structures test2

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1. The best arrangement to provide unified behaviour in built up steel columns is by ______.
lacing	battening
tie plates	perforated cover plates

2. If the 20 mm rivets are used in lacing bars, then the minimum width of lacing bar should be ______.
40mm	60mm
80mm	100mm

3. The use of tie plates in laced columns is _____.
prohibited	not prohibited
permitted at start and end of lacing system only	permitted between two parts of the lacing

4. Lacing bars in a steel column should be designed to resist _______.
bending moment due to 2.5% of the column load	shear force due to 2.5% of the column load
2.5% of the column load	both (a) and (b)

5. Angle of inclination of the lacing bar with the longitudinal axis of the column should preferably be between ______.
10° to 30°	30° to 40°
40° to 70°	90°

6. The effective length of a battened column is increased by _______.
5%	10%
15%	20%

7. The overlap of batten plates with the main members in welded connections should be more than ______.
3t	4t
6t	8t

8. The slenderness ratio of lacing bars should not exceed ______.
100	120
145	180

9. Economical depth of a plate girder corresponds to ______.
minimum weight	minimum depth
maximum weight	minimum thickness of web

10. Shear buckling of web in a plate girder is prevented by using _______.
vertical intermediate stiffener	horizontal stiffener at neutral axis
bearing stiffener	none of the above

11. Horizontal stiffener in a plate girder is provided to safeguard against
shear buckling of web plate	compression buckling of web plate
yielding	all of the above

12. Minimum thickness of web in a plate girder, when the plate is accessible and also exposed to weather, is _____.
5 mm	6 mm
8 mm	10 mm

13. The web crippling due to excessive bearing stress can be avoided by ______.
increasing the web thickness	providing suitable stiffeners
increasing the length of the bearing plates	none of the above

14. As per IS : 800, for compression flange, the outstand of flange plates should not exceed
121	161
201	251

15. Intermediate vertical stiffeners in a plate girder need be provided if the depth of web exceeds ______.
501	851
200t	2501

16. Bearing stiffener in a plate girder is used to ______.
transfer the load from the top flange to the bottom one	prevent buckling of web
decrease the effective depth of web	prevent excessive deflection

17. The forces acting on the web splice of a plate girder are ______.
axial forces	shear and axial forces
shear and bending forces	axial and bending forces

18. Gantry girders are designed to resist _______.
lateral loads	longitudinal loads and vertical loads
lateral, longitudinal and vertical loads	lateral and longitudinal loads

19. Minimum spacing of vertical stiffeners is limited to ______.
d/4	d/3
d/2	2d/3

20. Rivets connecting flange angles to cover plates in a plate girder are subjected to ______.
horizontal shear only	vertical load only
both (a) and (b)	none of the above

Online Quiz Design of Steel Structures test1

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1. The heaviest I-section for same depth is ____.
ISMB	ISLB
ISHB	ISWB

2. Bending compressive and tensile stresses respectively are calculated based on _____.
net area and gross area	gross area and net area
net area in both cases	gross area in both cases

3. If the thickness of thinnest outside plate is 10 mm, then the maximum pitch of rivets in tension will be taken as ______.
120 mm	160 mm
200 mm	300 mm

4. In a gusseted base, when the end of the column is machined for complete bearing on the base plate, then the axial load is assumed to be transferred to base plate
fully by direct bearing	fully through fastenings
50% by direct bearing and 50% through fastenings	75% by direct bearing and 25% through fastenings

5. When the axis of load lies in the plane of rivet group, then the rivets are subjected to _____.
only shear stresses	only tensile stresses
both (a) and (b)	none of the above

6. When the axis of load lies in the plane of rivet group, then the most heavily loaded rivet will be the one which
is at the maximum distance from CG of the rivet group	is at the minimum distance from CG of the rivet group
gives the maximum angle between the two forces Fa and Fm	gives the minimum angle between the two forces Fa and Fm

7. Which of the following types of riveted joint is free from bending stresses ?
lap joint	butt joint with single cover plate
butt joint with double cover plates	none of the above

8. The difference between gross diameter and nominal diameter for the rivets up to 25 mm diameter is ______.
1.0 mm	1.5 mm
2.0 mm	2.5 mm

9. As compared to field rivets, the shop rivets are _____.
stronger	weaker
equally strong	any of the above

10. If the thickness of plate to be connected by a rivet is 16 mm, then suitable size of rivet as per Unwin's formula will be ______.
16 mm	20 mm
24 mm	27 mm

11. By providing sufficient edge distance, which of the following failures of riveted joint can be avoided ?
tension failure of the plate	shear failure of the rivet
shear failure of the plate	crushing failure of the rivet

12. Minimum pitch of the rivets shall not be less than ______.
1.5 d	2.0 d
2.5 d	3.0 d

13. Efficiency of a riveted joint, having the minimum pitch as per IS : 800, is ______.
40%	50%
60%	70%

14. Select the correct statement?
Material cost of a rivet is higher than that of a bolt.	Tensile strength of a bolt is lesser than that of a rivet.
Bolts are used as a temporary fastenings whereas rivets are used as permanent fastenings.	Riveting is less noisy than bolting.

15. Bolts are most suitable to carry
shear	bending
axial tension	shear and bending

16. Diameter of a bolt hole is usually taken as ______.
gross diameter of bolt	nominal diameter + 1.5 mm
nominal diameter + 2.0 mm	nominal diameter of bolt

17. When the bolts are subjected to reversal of stresses, the most suitable type of bolt is ______.
black bolt	ordinary unfinished bolt
turned and fitted bolt	high strength bolt

18. In the cross-section of a weld, throat is the _______.
minimum dimension	average dimension
maximum dimension	none of the above

19. The effective length of a fillet weld should not be less than _______.
two times the weld size	four times the weld size
six times the weld size	weld size

20. The actual thickness of butt weld as compared to the thickness of plate is usually
more	less
equal	none of the above

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