1. Maximum strain in an extreme fibre in concrete and in the tension reinforcement (Fe-415 grade and E_s = 200 kN/mm²) in a balanced section at limit state of flexure are respectively

1. 1. 0.0035 and 0.0038

   
   
   

   2. 0.002 and 0.0018

   
   
   

   3. 0.0035 and 0.0041

   
   
   

   4. 0.002 and 0.0031

   
   
   

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1. View Hint View Answer Discuss in Forum

   Max strain in steel
   

   = 0.002 +	0.87 fy
   	Es

   
   

   = 0.002 +	0.87 × 415	= 0.0038
   	200 × 103

   
   For concrete max strain = 0.0035

   Correct Option: A

   Max strain in steel
   

   = 0.002 +	0.87 fy
   	Es

   
   

   = 0.002 +	0.87 × 415	= 0.0038
   	200 × 103

   
   For concrete max strain = 0.0035

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2. As per the provisions of IS 456-2000, the (short-term) modulus of elasticity of M 25 grade concrete (in N/mm²) can be assumed to be

1. 1. 25000

   
   
   

   2. 28500

   
   
   

   3. 30000

   
   
   

   4. 36000

   
   
   

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1. View Hint View Answer Discuss in Forum

   E_C = 5000 √25
   = 25000 MPa

   Correct Option: A

   E_C = 5000 √25
   = 25000 MPa

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3. As per provisions of IS 456-2000, in the limit state method for design of beams, the limiting value of the depth of neutral axis in a reinforced concrete beam of effective depth ‘d’ is given as

1. 1. 0.53 d

   
   
   

   2. 0.48 d

   
   
   

   3. 0.46 d

   
   
   

   4. any of the above depending on the different grades of steel.

   
   
   

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1. View Hint View Answer Discuss in Forum

   Limiting value of depth of neutral axis depends on grade of concrete.

   Correct Option: D

   Limiting value of depth of neutral axis depends on grade of concrete.

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4. Match the information related to tests on aggregates given in Group-I with that in Group-II
   Group-I
   P. Resistance to impact
   Q. Resistance to wear
   R. Resistance to weathering action
   S. Resistance to crushing
   Group-II
   1. Hardness
   2. Strength
   3. Toughness
   4. Soundness

1. 1. P-1, Q-3, R-4, S-2

   
   
   

   2. P-3, Q-1, R-4, S-2

   
   
   

   3. P-4, Q-1, R-3, S-2

   
   
   

   4. P-3, Q-4, R-2, S-1

   
   
   

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1. View Hint View Answer Discuss in Forum

   Resistance to impact – Toughness
   Resistance to wear – Hardness
   Resistance to weathering action – Soundness
   Resistance to crushing – Strength

   Correct Option: B

   Resistance to impact – Toughness
   Resistance to wear – Hardness
   Resistance to weathering action – Soundness
   Resistance to crushing – Strength

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5. Top ring beam of an Intze tank carries a hoop tension of 120 kN. the beam cross-section is 250 mm wide the 400 mm deep and it is reinforced with 4 bars of 20 mm diameter of Fe 415 grade. Modular ratio of the concrete is 10. The tensile stress in N/ mm² in the concrete is

1. 1. 1.02

   
   
   

   2. 1.07

   
   
   

   3. 1.20

   
   
   

   4. 1.32

   
   
   

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1. View Hint View Answer Discuss in Forum

   Area of reinforcement
   

   = 4 ×		π		× 202 = 1256.63 mm2
   		4

   
   Equivalent area of concrete = m. Ast + (250 × 400 – Ast)
   = 10 × 1256.6 + (250 × 400 – 1256.6)
   = 111309.6 mm²
   Stress in concrete
   

   =	120 × 103	= 1.078 N/mm2
   	11309.6

   Correct Option: B

   Area of reinforcement
   

   = 4 ×		π		× 202 = 1256.63 mm2
   		4

   
   Equivalent area of concrete = m. Ast + (250 × 400 – Ast)
   = 10 × 1256.6 + (250 × 400 – 1256.6)
   = 111309.6 mm²
   Stress in concrete
   

   =	120 × 103	= 1.078 N/mm2
   	11309.6

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