Design of Steel Structures MCQ

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Q1. If the area of cross-section of a single angle discontinuous strut is 30 cm2 and allowable working stress corresponding to its slenderness ratio is 625 kg/cm2, the safe load carrying capacity of the member, is

(A) 10 tonnes
(B) 12 tonnes
(C) 15 tonnes
(D) 18 tonnes

Answer: (C) 15 tonnes

Q2. For simply supported beams, the maximum permitted deflection, is

(A) 1/325 of the span
(B) 1/350 of the span
(C) 1/375 of the span
(D) 1/400 of the span

Answer: (A) 1/325 of the span

Q3. With usual notations of the letters, the shear stress fs at any point of the cross-section is given by

(A) fs =FQ/It
(B) fs =Ft/IQ
(C) fs =It/FQ
(D) fs =IF/Qt

Answer: (A) fs =FQ/It

Q4. The ratio of plastic section modulus to elastic section modulus

(A) Is equal to 1
(B) Is always less than 1
(C) Is always greater than 1
(D) Can be less than 1

Answer: (C) Is always greater than 1

Q5. Minimum spacing of vertical stiffeners is limited to

(A) d/4
(B) d/3
(C) d/2
(D) 2d/3
Where d is the distance between flange angles

Answer: (B) d/3

Q6. According to IS Specifications, the maximum pitch of rivets in compression is

(A) Lesser of 200 mm and 12 t
(B) Lesser of 200 mm and 16 t
(C) Lesser of 300 mm and 32 t
(D) Lesser of 3 00 mm and 24 t
Where ‘t’ is thickness of thinnest outside plate or angle

Answer: (A) Lesser of 200 mm and 12 t

Q7. Bulb angles are used in

(A) Column building
(B) Bridge building
(C) Ship building
(D) Water tank building

Answer: (C) Ship building

Q8. The rolled steel I-sections are most commonly used as beams because these provide

(A) Large moment of inertia with less cross-sectional area
(B) Large moment of resistance as compared to other section
(C) Greater lateral stability
(D) All the above

Answer: (D) All the above

Q9. Poisson’s ratio for steel within elastic limit, ranges from

(A) 0.15 to 0.20
(B) 0.25 to 0.24
(C) 0.25 to 0.33
(D) 0.33 to 0.35

Answer: (C) 0.25 to 0.33

Q10. The diameter of a bolt hole is taken as the nominal diameter of the bolt plus

(A) 1.0 mm
(B) 1.2 mm
(C) 1.4 mm
(D) 1.6 mm

Answer: (D) 1.6 mm

Q11. If P is the wind pressure in kg/cm2, v is the velocity in km/hour and K is a constant of proportionality, then

(A) P = K/v2
(B) v = K/P2
(C) P = Kv2
(D) P = Kv

Answer: (C) P = Kv2

Q12. The minimum width B of a solid casing for a cased beam, is equal to

(A) B = b + 25 mm
(B) B = b + 50 mm
(C) B = b + 75 mm
(D) B = b + 100 mm

Answer: (D) B = b + 100 mm

Q13. The minimum thickness of a steel plate, which is directly exposed to weather and is not accessible for cleaning and repainting, should be:

(A) 4.5 mm
(B) 6 mm
(C) 8 mm
(D) 10 mm

Answer: (C) 8 mm

Q14. As per IS : 875, for the purposes of specifying basic wind velocity, the country has been divided into

(A) 4 zones
(B) 5 zones
(C) 6 zones
(D) 7 zones

Answer: (C) 6 zones

Q15. Horizontal stiffener in a plate girder is provided to safeguard against

(A) Shear buckling of web plate
(B) Compression buckling of web plate
(C) Yielding
(D) All of the above

Answer: (B) Compression buckling of web plate