Question: According to Whitney’s theory, ultimate strain of concrete is assumed to be_____________?

• 1. 0.03%
• 2. 0.1%
• 3. 0.3%
• 4. 3%

Question: The design yield stress of steel according to IS: 456-1978 is_______________?

• 1. 0.37 fy
• 2. 0.57 fy
• 3. 0.67 fy
• 4. 0.87 fy

Question: According to Whitney’s theory, depth of stress block for a balanced section of a concrete beam is limited to_______________?

• 1. 0.43 d
• 2. 0.537 d
• 3. 0.68 d
• 4. 0.85 d

Question: Due to shrinkage stresses, a simply supported beam having reinforcement only at bottom tends to_____________?

• 1. deflect downward
• 2. deflect upward
• 3. deflect downward or upward
• 4. none of the above

Question: A beam curved in plan is designed for_______________?

• 1. bending moment and shear
• 2. bending moment and torsion
• 3. shear and torsion
• 4. bending moment, shear and torsion

Question: In a spherical dome the hoop stress due to a concentrated load at crown is_______________?

• 1. compressive everywhere
• 2. tensile everywhere
• 3. partly compressive and partly tensile
• 4. zero

Question: In prestressed concrete______________?

• 1. forces of tension and compression change but lever arm remains unchanged
• 2. forces of tension and compressions remain unchanged but lever arm changes with the moment
• 3. both forces of tension and compres-sion as well as lever arm change
• 4. both forces of tension and compres-sion as well as lever arm remain unchanged

Question: Normally prestressing wires are arranged in the_______________?

• 1. upper part of the beam
• 2. lower part of the beam
• 3. center
• 4. anywhere

Question: Which of the following losses of prestress occurs only in pretensioning and not in post-tensioning ?

• 1. elastic shortening of concrete
• 2. shrinkage of concrete
• 3. creep of concrete
• 4. loss due to friction

Question: Which of the following has high tensile strength ?

• 1. plain hot rolled wires
• 2. cold drawn wires
• 3. heat treated rolled wires
• 4. all have same tensile strength