# Practice Test: Question Set - 20

**1. For steel members not exposed to weather, the thickness of steel should not be less than**

- (A) 4.5 mm

- (B) 6 mm

- (C) 8 mm

- (D) 10 mm

**2. When a tension member consists of two channel sections, the allowance for rivet hole is made for two holes from**

- (A) Each web

- (B) Each flange

- (C) Each web or
one hole from each flange whichever is more

- (D) Each web or
one hole from each flange whichever is less

**3. 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*/{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*)}]

**4. Assuming the values of maximum deviation Î”**

*P*and Î”*E*to be 25% of the computed value of*P*and*E*respectively, the minimum value of the factor of safety is- (A) 1.00

- (B) 0.67

- (C) 1.67

- (D) 2.67

**5. A beam is defined as a structural member subjected to**

- (A) Axial
loading

- (B) Transverse
loading

- (C) Axial and
transverse loading

- (D) None of
these

**6. The allowable stress in axial tension for rolled I-sections and channels, is taken as**

- (A) 1420 kg/cm

^{2}

- (B) 1500 kg/cm

^{2}

- (C) 2125 kg/cm

^{2}

- (D) 1810 kg/cm

^{2}

**7. Secant formula for direct stress in compression, is applicable only for slenderness ratio upto**

- (A) 120

- (B) 130

- (C) 140

- (D) 150

**8. An axial loaded column is supported on a slab base whose projection is 8 cm. If the intensity of pressure from concrete is 40 kg/cm**

^{2}and allowable bending stress in slab base is 1890 kg/cm^{2}, the thickness (*t*) of the slab base, is- (A)

*t*= √(21/64)

- (B)

*t*= √(64/21)

- (C)

*t*= 21/64

- (D)

*t*= 64/21

**9. A compression member consisting of angle sections may be a**

- (A) Continuous
member

- (B) Discontinuous
single angle strut

- (C) Discontinuous
double angle strut

- (D) All the
above

**10. The main advantage of a steel member, is:**

- (A) Its high
strength

- (B) Its gas and
water tightness

- (C) Its long
service life

- (D) All the
above

**11. A riveted joint may experience**

- (A) Shear
failure

- (B) Shear
failure of plates

- (C) Bearing
failure

- (D) All the
above

**12. IS : 800 - 1971 recommends that in a splice plate the number of rivets carrying calculated shear stress through a packing greater than 6 mm thick, is to be increased by 2.5% for every**

- (A) 1.00 mm
thickness of packing

- (B) 1.50 mm
thickness of packing

- (C) 2.0 mm
thickness of packing

- (D) 2.50 mm
thickness of packing

**13. To the calculated area of cover plates of a built-up beam, an allowance for rivet holes to be added, is**

- (A) 10 %

- (B) 13 %

- (C) 15 %

- (D) 18 %

**14. If the moment of inertia of a section about its axis is ‘**

*I’*and its effective sectional area is ‘*A’*, 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*)

**15. 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

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