McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 251. |
If the moment of inertia of a section about its axis is and its effective sectional area is , its radius of gyration r about the axis, is |
| A. | r = i/a |
| B. | r i/a) |
| C. | r = (i/a) |
| D. | r a/i) |
| Answer» B. r i/a) | |
| 252. |
A structural member subjected to compressive stress in a direction parallel to its longitudinal axis, is generally known as |
| A. | column |
| B. | stanchion |
| C. | post |
| D. | all the above |
| Answer» D. all the above | |
| 253. |
Live load |
| A. | varies in magnitude |
| B. | varies in position |
| C. | is expressed as uniformly distributed load |
| D. | all the above |
| Answer» D. all the above | |
| 254. |
The maximum permissible slenderness ratio of a member carrying loads resulting from wind, is |
| A. | 180 |
| B. | 200 |
| C. | 250 |
| D. | 300 |
| Answer» C. 250 | |
| 255. |
The average shear stress for rolled steel beam section, is |
| A. | 845 kg/cm2 |
| B. | 945 kg/cm2 |
| C. | 1025 kg/cm2 |
| D. | 1500 kg/cm2 |
| Answer» B. 945 kg/cm2 | |
| 256. |
For a rectangular section, the ratio of the maximum and average shear stresses, is |
| A. | 1.5 |
| B. | 2.0 |
| C. | 2.5 |
| D. | 3.5 |
| Answer» A. 1.5 | |
| 257. |
For the steel member exposed to weather and accessible for repainting, the thickness of steel should not be less than (accepting the webs of Indian Standard rolled steel joists and channels). |
| A. | 4 mm |
| B. | 6 mm |
| C. | 8 mm |
| D. | 10 mm |
| Answer» B. 6 mm | |
| 258. |
The permissible stress in bending for rolled steel I-beams and channels, is |
| A. | 1500 kg/cm2 |
| B. | 1575 kg/cm2 |
| C. | 945 kg/cm2 |
| D. | 1650 kg/cm2 |
| Answer» D. 1650 kg/cm2 | |
| 259. |
The distance measured along one rivet line from the centre of a rivet to the centre of adjoining rivet on an adjacent parallel rivet line, is called |
| A. | pitch of rivet |
| B. | gauge distance of rivet |
| C. | staggered pitch |
| D. | all the above |
| Answer» C. staggered pitch | |
| 260. |
The effective length of a simply supported beam with ends restrained against torsion, and also the ends of compression flange partially restrained against lateral bending, is given by |
| A. | l = span |
| B. | l = 0.85 span |
| C. | l = 0.75 span |
| D. | l = 0.7 span |
| Answer» B. l = 0.85 span | |
| 261. |
The permissible bearing stress in steel, is |
| A. | 1500 kg/cm2 |
| B. | 1890 kg/cm2 |
| C. | 2025 kg/cm2 |
| D. | 2340 kg/cm2 |
| Answer» B. 1890 kg/cm2 | |
| 262. |
Strengths of a rivet in single shearing, in bearing and in tearing are 3425 kg, 4575 kg and 5025 kg respectively. If the load in the member is 35 tonnes, the number of rivets required, is |
| A. | 10 |
| B. | 11 |
| C. | 12 |
| D. | 13 |
| Answer» D. 13 | |
| 263. |
The bending moment for filler joists at the middle of an intermediate span, is |
| A. | wl²/10 |
| B. | - wl²/10 |
| C. | - wl²/12 |
| D. | wl²/12 |
| Answer» D. wl²/12 | |
| 264. |
A simply supported beam carrying a central load, will be safe in deflection if the ratio of its span to depth, is |
| A. | < 19 |
| B. | < 24 |
| C. | > 19 |
| D. | > 24 |
| Answer» B. < 24 | |
| 265. |
When a load is transferred through one surface to another surface in contact, the stress is known as |
| A. | tensile stress |
| B. | compressive stress |
| C. | shearing stress |
| D. | none of these |
| Answer» D. none of these | |
| 266. |
If p and d are pitch and gross diameter of rivets, the efficiency ( ) of the riveted joint, is given by |
| A. | = p/p - d |
| B. | = p/p + d |
| C. | = p - d/p |
| D. | = p + d/p |
| Answer» C. = p - d/p | |
| 267. |
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 | |
| 268. |
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» D. all the above | |
| 269. |
Spans of continuous fillers are considered approximately equal if the longest span does not exceed the shortest span by more than |
| A. | 5 % |
| B. | 10 % |
| C. | 15 % |
| D. | 20 % |
| Answer» C. 15 % | |
| 270. |
The ratio of the span L of the filler joists to the depth d from the underside of the joist to the top of the structural concrete, should not exceed |
| A. | 60 |
| B. | 45 |
| C. | 35 |
| D. | 25 |
| Answer» C. 35 | |
| 271. |
With a percentage increase of carbon in steel, decreases its |
| A. | strength |
| B. | hardness |
| C. | brittleness |
| D. | ductility |
| Answer» D. ductility | |
| 272. |
The allowable stress in axial tension is generally kept less if thickness of the member is more than |
| A. | 10 mm |
| B. | 12 mm |
| C. | 15 mm |
| D. | 20 mm |
| Answer» D. 20 mm | |
| 273. |
The maximum permissible slenderness ratio of compression member carrying dead and superimposed load, is |
| A. | 180 |
| B. | 200 |
| C. | 250 |
| D. | 350 |
| Answer» A. 180 | |
| 274. |
Tacking rivets in compression plates not exposed to the weather, have a pitch not exceeding 300 mm or |
| A. | 16 times the thickness of outside plate |
| B. | 24 times the thickness of outside plate |
| C. | 32 times the thickness of outside plate |
| D. | 36 times the thickness of outside plate |
| Answer» C. 32 times the thickness of outside plate | |
| 275. |
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/{1 + 0.35 (b/a)}] |
| B. | a + [b/{1 + 0.35 (b/a)}] |
| C. | a - [b/{1 + 0.2 (b/a)}] |
| D. | a + [b/{1 + 0.2 (b/a)}] |
| Answer» B. a + [b/{1 + 0.35 (b/a)}] | |
| 276. |
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/l) + (3ad/l²) |
| B. | (a/l) + (6ad/l²) |
| C. | (a/l) - (6ad/l²) |
| D. | (a/l) - (3ad/l²) |
| Answer» B. (a/l) + (6ad/l²) | |
| 277. |
Select the correct statement |
| A. | Material cost of a rivet is higher than that of abolt |
| B. | Tensile strength of a bolt is lesser than that of a rivet |
| C. | Bolts are used as a temporary fastening whereas rivets are used as permanentfastenings |
| D. | Riveting is less noisy than bolting |
| Answer» C. Bolts are used as a temporary fastening whereas rivets are used as permanentfastenings | |
| 278. |
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 |
| A. | Fully by direct bearing |
| B. | Fully through fastenings |
| C. | 50% by direct bearing and 50% through fastenings |
| D. | 75% by direct bearing and 25% through fastenings |
| Answer» C. 50% by direct bearing and 50% through fastenings | |
| 279. |
If the floor is supported at or near the bottom but top chords of a bridge is not braced, then the bridge is called |
| A. | Deck type |
| B. | Through type |
| C. | Half through type |
| D. | Double deck type |
| Answer» C. Half through type | |
| 280. |
The elastic strain for steel is about |
| A. | 1/12 of strain at the initiation of strain hardening and about 1/120 of maximum strain |
| B. | 1/2 of strain at the initiation of strain hardening and about 1/12 of maximum strain |
| C. | 1/12 of strain at the initiation of strain hardening and 1/200 of maximumstrain |
| D. | 1/24 of strain at the initiation of strain hardening and about 1/200 of maximum strain |
| Answer» C. 1/12 of strain at the initiation of strain hardening and 1/200 of maximumstrain | |
| 281. |
In moment resistant connections, the moment resistance of riveted connection depends upon |
| A. | Shear in rivets |
| B. | Compression in rivets |
| C. | Tension in rivets |
| D. | Strength of rivets in bearing |
| Answer» C. Tension in rivets | |
| 282. |
The moment of the couple set up in a section of a beam by the longitudinal compressive and tensile force, is known as |
| A. | Bending moment |
| B. | Moment of resistance |
| C. | Flexural stress moment |
| D. | None of these |
| Answer» B. Moment of resistance | |
| 283. |
The thickness of the web of a mild steel plate girder is less than d/200. If only one horizontal stiffener is used, it is placed at |
| A. | The neutral axis of the section |
| B. | 2/3rd of the depth of the neutral axis from the compressionflange |
| C. | 2/5th of the depth of the neutral axis from the compressionflange |
| D. | 2/5th of the height of the neutral axis from tensionflange |
| Answer» C. 2/5th of the depth of the neutral axis from the compressionflange | |
| 284. |
The most commonly used sections in lateral system to carry shear force in built up columns, are |
| A. | Rolled steel flats |
| B. | Rolled angles |
| C. | Rolled channels |
| D. | All the above |
| Answer» D. All the above | |
| 285. |
The bracing between two columns of a steel tank will be designed to resist |
| A. | Horizontal shear due to wind or earthquake only |
| B. | Horizontal, shear due to wind or earthquake + 2.5% of column loads |
| C. | Column loads + 2.5% of horizontal shear due to wind or earthquake |
| D. | Column loads + full horizontal shear due to wind orearthquake |
| Answer» B. Horizontal, shear due to wind or earthquake + 2.5% of column loads | |
| 286. |
A beam may be designed as a cased beam if |
| A. | Section is of double open channel form with the webs not less than 40 mmapart |
| B. | Overall depth and width of the steel section do not exceed 750 and 450 mmrespectively |
| C. | Beam is solidly encased in concrete with 10 mm aggregate having 28 days strength 160kg/cm2 |
| D. | All the above |
| Answer» D. All the above | |
| 287. |
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. | fbc = (M/Ixx) × y |
| B. | fbc = (Ixx/M) × y |
| C. | fbc = (Ixx/M) + y |
| D. | fbc = (M/Ixx) + y |
| Answer» A. fbc = (M/Ixx) × y | |
| 288. |
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» B. Two dimensional | |
| 289. |
Compression members composed of two channels back-to-back and separated by a small distance are connected together by riveting so that the minimum slenderness ratio of each member between the connections, does not exceed |
| A. | 40 |
| B. | 50 |
| C. | 60 |
| D. | 70 |
| Answer» A. 40 | |
| 290. |
The connection of intermediate vertical stiffeners to the web, not subjected to external loads, shall be designed for a minimum shear force (kN/m) of (Where, t = the web thickness in mm and h = the outstand of stiffener in mm) |
| A. | 75 t²/h |
| B. | 125 t3/h² |
| C. | 125 t²/h |
| D. | 175 t²/h |
| Answer» C. 125 t²/h | |
| 291. |
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» D. All the above | |
| 292. |
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» A. Bending moment at the centre of the beam | |
| 293. |
The allowable shear stress in the web of mild steel beams decreases with (Where 'h is thickness) |
| A. | Decrease in h/t ratio |
| B. | Increase in h/t ratio |
| C. | Decrease in thickness |
| D. | Increase in height |
| Answer» B. Increase in h/t ratio | |
| 294. |
On eccentrically loaded columns, the equivalent axial load may be obtained by |
| A. | Adding the axial load, eccentric load, the product of the bending moment due to eccentric load and the appropriate bending factor |
| B. | Adding the axial load and eccentric load and subtracting the product of bending moment and appropriate bending factor |
| C. | Dividing the sum of axial load and eccentric load by the product of the bending moment and appropriate bending factor |
| D. | None of these |
| Answer» A. Adding the axial load, eccentric load, the product of the bending moment due to eccentric load and the appropriate bending factor | |
| 295. |
In a truss girder of a bridge, a diagonal consists of mild steel flat 4001.S.F. and carries a pull of 80 tonnes. If the gross-diameter of the rivet is 26 mm, the number of rivets required in the splice, is |
| A. | 6 |
| B. | 7 |
| C. | 8 |
| D. | 9 |
| Answer» C. 8 | |
| 296. |
When the bolts are subjected to reversal of stresses, the most suitable type of bolt is |
| A. | Black bolt |
| B. | Ordinary unfinished bolt |
| C. | Turned and fitted bolt |
| D. | High strength bolt |
| Answer» D. High strength bolt | |
| 297. |
The size of a butt weld is specified by the effective throat thickness which in the case of incomplete penetration, is taken as |
| A. | ½ of the thickness of thicker part |
| B. | ¾ of the thickness of thicker part |
| C. | ¾ of the thickness of thinner part |
| D. | 7/8 of the thickness of thinner part |
| Answer» D. 7/8 of the thickness of thinner part | |
| 298. |
In a built up section carrying a tensile force, the flanges of two channels are turned outward |
| A. | To simplify the transverse connections |
| B. | To minimise lacing |
| C. | To have greater lateral rigidity |
| D. | All the above |
| Answer» C. To have greater lateral rigidity | |
| 299. |
The overlap of batten plates with the main members in welded connections should be more than |
| A. | 3 t |
| B. | 4 t |
| C. | 6 t |
| D. | 8 tt |
| Answer» B. 4 t | |
| 300. |
Modified moment of inertia of sections with a single web, is equal to moment of inertia of the section about Y-Y axis at the point of maximum bending moment and is multiplied by the ratio of |
| A. | Area of compression flange at the minimum bending moment to the corresponding area at the point of maximum bending moment |
| B. | Area of tension flange at the minimum bending moment of the corresponding area atthe point of maximum bending moment |
| C. | Total area of flanges at the maximum bending moment to the corresponding area at the point of maximum bending moment |
| D. | None of these |
| Answer» C. Total area of flanges at the maximum bending moment to the corresponding area at the point of maximum bending moment | |
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