Rajasthan Technical Education Second Year Paper 2016 – Concrete Technology

Rajasthan Technical Education Second Year Paper 2016 – Concrete Technology

Approximate amount of lime in cement
(a) 60% – 65%
(b) 50% – 55%
(c) 80% – 85%
(d) 75% – 80%

Approximate amount of C3S in cement
(a) 25% – 50%
(b) 18% – 20%
(c) 5% – 12%
(d) 0% – 5%

Initial setting time of cement is
(a) 45 minutes
(b) 55 minutes
(c) 30 minutes
(d) 60 minutes

As per I.S soundness of cement should not be more than
(a) 10 mm
(b) 20 mm
(c) 30 mm
(d) 40 mm

Which is NOT used to increase setting time of cement ?
(a) Gypsum
(b) Sugar
(c) Starch
(d) Calcium Chloride

pH of water used in concrete should be
(a) 3 – 4
(b) 6 – 8
(c) 8 – 10
(d) 9 – 11

Most fine aggregate is from
(a) Zone I
(b) Zone II
(c) Zone III
(d) Zone IV

Aim of compaction of concrete is
(a) Increase density
(b) Reduce density
(c) Increase the voids
(d) All of above

Size of specimen to determine compressive strength of concrete
(a) 150 mm x 150 mm x 150 mm
(b) 100 mm x 100 mm x 100 mm
(c) 150 cm x 150 cm x 150 cm
(d) 100 cm x 100 cm x 100 cm

Factor effecting compressive strength of concrete
(a) Water – Cement Ratio
(b) Age
(c) Time of mixing of concrete
(d) All of the above

Factor effecting creep of concrete
(a) Water-cement ratio
(b) Aggregate-cement ratio
(c) Fineness of cement
(d) All of the above

Most used cement in under sea constructions
(a) Low heat cement
(b) High alumina cement
(c) Super sulphate cement
(d) All of the above

Light weigth concrete is
(a) Strength is more
(b) Building construction cost is more
(c) Weight of construction becomes less
(d) None of the above

Time of removal of form work from walls, columns and vertical sides of beam
(a) 1 to 2 days
(b) 3 days
(c) 7 days
(d) 14 days

Tensile strength of concrete is __________% of compressive strength
(a) 25%
(b) 10%
(c) 15%
(d) 20%