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

Question: Stress strain curve of high tensile steel_______________?

• 1. has a definite yield point
• 2. does not show definite yield point but yield point is defined by 0.1% proof stress
• 3. does not show definite yield point but yield point is defined by 0.2% proof stress
• 4. does not show definite yield point but yield point is defined by 2% proof stress

Question: Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than__________________?

• 1. 35 MPa and 42 MPa
• 2. 42 MPa and 35 MPa
• 3. 42 MPa and 53 MPa
• 4. 53 MPa and 42 MPa

Question: Ultimate strength of cold drawn high steel wires_______________?

• 1. increases with increase in diameter of bar
• 2. decreases with increase in diameter of bar
• 3. does not depend on diameter of bar
• 4. none of the above

Question: High carbon content in the steel causes_______________?

• 1. decrease in tensile strength but increase in ductility
• 2. increase in tensile strength but decrease in ductility
• 3. decrease in both tensile strength and ductility
• 4. increase in both tensile strength and ductility

Question: Prestress loss due to friction occurs________________?

• 1. only in post-tensioned beams
• 2. only in pretensioned beams
• 3. in both post-tensioned and preten-sioned beams
• 4. none of the above

Question: Most common method of prestressing used for factory production is________________?

• 1. Long line method
• 2. Freyssinet system
• 3. Magnel-Blaton system
• 4. Lee-Macall system

Question: The purpose of reinforcement in prestressed concrete is________________?

• 1. to provide adequate bond stress
• 2. to resist tensile stresses
• 3. to impart initial compressive stress in concrete
• 4. all of the above