TOP 7 : STEEL STRUCTURE

1: With percentage increase of carbon in steel , decreases its
A: Strength
B: Hardness
C: Brittleness
D: Ductility  

2: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

3: 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

4:Maximum permissible slenderness ratio of compression members which carry dead and superimposed load, is
A:350
B:250
C:180
D:80

5:The effective length of a weld, is taken as the actual length
A: Minus the size of weld
B: Minus twice the size of weld
C: Plus the size of weld
D: Plus twice the size of weld

6:A beam is defined as a structural member subjected to
A: Axial loading
B:Transverse loading
C: Axial and transverse loading

7:The best compression member section for column is:
A: Single angle section
B: Double angle section
C: Channel section
D: I-section

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Los Angeles Abrasion Test , Why and How To Perform

LOS ANGELES ABRASION TEST:

This is hardness test for aggregates, used in Laboratory  to determine the hardness value or abrasion value 

APPARATUS :

 Los Angeles Abrasion Testing Machine ,

Abrasive Charge – Cast iron or steel balls ,
Test sieve – 1.70 mm IS sieve ,

 Balance of capacity 10 kg , Oven , Tray

The aggregate used in surface course of the highway pavements are subjected to wearing due to movement of traffic. 

When vehicles move on the road, the soil particles present between the pneumatic tyres and road surface cause abrasion of road aggregates. 

The steel reamed wheels of animal driven vehicles also cause considerable abrasion of the road surface. 

Therefore, the road aggregates should be hard enough to resist abrasion. 

The principle of Los Angeles abrasion test is to produce abrasive action by use of standard steel balls which when mixed with aggregates and rotated in a drum for specific number of revolutions also causes impact on aggregates. 

The percentage wear of the aggregates due to rubbing with steel balls is determined and is known as Los Angeles Abrasion Value.

Key point of los angles test:

Rotate the machine at a speed of 30 – 33 revolutions per minute. The number of revolutions is 500 for grading A, B, C & D and 1000 for grading E, F & G. The machine should be

5 kg of sample for grading A, B, C & D and 10 kg for grading E, F & G

THE CALCULATION PART:

Original weight of aggregate sample = W1 g

Weight of aggregate sample retained = W2 g

Weight passing 1.7mm IS sieve = W1 - W2 g

Los Angeles Abrasion Value = (W1 - W2) / W1 X 100

Los angeles abrasion value should lies in below given range for different types of roads

Types of pavement layers                                         Max. Permissible Abrasion Value in %

1:WBM , SUB BASE COURSE                                                      60%

2:WBM BASE COURSE WITH BITUMEN SURFACE               50%

3: BITUMEN BOUND MACADAM                                             50%

4:WBM SURFACING COURSE                                                    40%

5: BITUMINOUS PENETRATION MACADAM                              40%

6:BITUMINOUS SURFACING DRESSING CEMENT
 CONCRETE SURFACING COURSE                                              35%

7:BITUMINOUS CONCRETE SURFACING COURSE                   30%

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TOP RCC QUESTIONS PART 2

12: The percentage of minimum reinforcement of the gross sectional area in slabs is:
A: 0.10%
B:0.12%
C:0.15%
D:0.18%

13: The amount of reinforcement for main bars in a slab is based upon:
A: Minimum bending moment
B: Maximum bending moment
C:Maximum shear force
D: Minimum shear force

14: In under reinforced singly reinforced beam , concrete crushes at its maximum strain
A: 0.35 %
B: 0.24%
C: 0.30%
D:0.20%

15: The maximum area of tension reinforcement in beams shall not exceed
A:0.15%
B:1.5%
C:4%
D:1%

16: A raft foundation is provided if its area exceeds the plan area of the building by: 50%

17: For a number of columns constructed in a row , the type of foundation provided is: Strip 

18 : As per IS :456, the reinforcement in a column should not be less than : 0.7 % and more than 7% of cross sectional area

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TOP 11 RCC Questions

1:The column is regarded as long column if the ratio of its effective length and lateral dimension , exceeds :
A: 10
B:15
C:20
D:35

2:The weight of foundation is assumed as?

A: 5% OF WALL WEIGHT 
B: 7% OF WALL WEIGHT 
C: 10% OF WALL WEIGHT
D: 12 % OF WALL WEIGHT


3:The shear reinforcenent in R.C.C. is provided to resist
A: VERTICAL SHEAR 
B: HORIZONTAL SHEAR 
C: DIAGONAL COMPRESSION
D: DIAGONAL TENSION 




4: An R.C.C.column is treated as short column if its slenderness ratio is less than: 50 ( Most IMP)

5: An R.C.C.column is treated as long column if its slenderness ratio is greater than: 50 (Most IMP)


6: As per I.S. 456-1978, the PH value of water shall be:
A: Less than 6
B: Equal to 6
C: Note less than 6
D:Equal to 7

7:The maximum area of tension reinforcement in beams shall not exceed : 4%

8: The steel generally used in RCC work : Mildsteel 

9: The diameter of main bars in RCC columns , shall not be less than : 12 mm

10: The characteristic strength of concrete is usually referred to:
A: 5 Days cube strength
B: 7 Days cube strength
C: 21 Days cube strength
D: 28 Days cube strength

11: Thickness of slab is taken:
A: 0.10d
B:0.20 d
C: 0.15d
D:0.25d



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Top 8 Most Asked Surveying Questions

1: When the contours intermix i.e. unite at a place that place is known as:

A: Cliff ,    B: Over hanging cliff        C: Ridge              D: Valley

2: Two contours of different elevations do not cross each other except in case of a :

A: Cliff      B: Ridge         C: Overhanging Cliff         D: Valley 

3:The Limiting length of an Offset should be:

A: 5 m       B: 15m        C:30m     D: 50 m

4:In levelling the correction for curvature  ( in meters ) is equal to:

A: 0.00785 Square of D  ,    B: 0.0785 Square of D  , C: 0.0112 Square of D ,   D:0.0673 Square of D

Where D is distance from the level to the staff reading in meters

5: The vertical distance between two consecutive contours is called: Contour Interval 

6: Reduced level of apoint is its elevatiob with refernce to :Datum Level

7:The error which is not completely eliminated in reciprocal levelling : Error Due to Refractionn 

8: THE first reading from a level station is: Back Sight

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