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Course=Concrete technology strength compressive with days cement      Subject=Concrete technology strength compressive with days cement

Question no-1
For quality control of Portland cement, the test essentially done is


Optional Answers

(a)                  setting time

(b)                  Soundness

(c)                  tensile strength

(d)                  Consistency

(e)                  all the above

Sollution

(e)                  all the above

Question no-2
If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is


Optional Answers

(a)                  20%

(b)                  25%

(c)                  30%

(d)                  35%

(e)                  40%

Sollution

(b)                  25%

Question no-3
Under normal conditions using an ordinary cement, the period of removal of the form work, is


Optional Answers

(a)                  7 days for beam soffits

(b)                  14 days for bottom slabs of spans 4.6 m and more

(c)                  21 days for bottom beams over 6 m spans

(d)                  2 days for vertical sides of columns

(e)                  all the above.

Sollution

(e)                  all the above.

Question no-4
WpandWfare the weights of a cylinder containing partially compacted and fully compacted concrete. If the compaction factor is 0.95, the workability of concrete is


Optional Answers

(a)                  extremely low

(b)                  very low

(c)                  low

(d)                  high

(e)                  none of these.

Sollution

(d)                  high

Question no-5
For given water content, workability decreases if the concrete aggregates contain an excess of


Optional Answers

(a)                  thin particles

(b)                  flat particles

(c)                  elongated particles

(d)                  flaky paticles

(e)                  all the above.

Sollution

(e)                  all the above.

Question no-6
After casting, an ordinary cement concrete on drying


Optional Answers

(a)                  expands

(b)                  mix

(c)                  shrinks

(d)                  none of these.

Sollution

(c)                  shrinks

Question no-7
To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between


Optional Answers

(a)                  1100 and 1200C

(b)                  1200 and 1300C

(c)                  1300 and 1400C

(d)                  1400 and 1500C

(e)                  1500 and 1600C

Sollution

(d)                  1400 and 1500C

Question no-8
The standard sand now a days used in India, is obtained from


Optional Answers

(a)                  Jaipur (Rajasthan)

(b)                  Jullundur (Punjab)

(c)                  Hyderabad (Andhra Pradesh)

(d)                  Ennore (Madras)

(e)                  Cuttuck (Orissa)

Sollution

(d)                  Ennore (Madras)

Question no-9
Construction joints are provided


Optional Answers

(a)                  where B.M. and S.F. are small

(b)                  where the member is supported by other member

(c)                  at 18 m apart in huge structures

(d)                  in concrete wall at sill level of windows

(e)                  all the above.

Sollution

(e)                  all the above.

Question no-10
Curing a concrete for long period ensures better


Optional Answers

(a)                  volume stability

(b)                  strength

(c)                  water resistance

(d)                  water tightness and durability

(e)                  all the above.

Sollution

(e)                  all the above.

Question no-11
Construction joints are generally provided in concrete


Optional Answers

(a)                  roads

(b)                  retaining walls

(c)                  lining of canals

(d)                  lining of tunnels

(e)                  all the above.

Sollution

(e)                  all the above.

Question no-12
Shrinkage in concrete can be reduced by using


Optional Answers

(a)                  low water cement ratio

(b)                  less cement in the concrete

(c)                  proper concrete mix

(d)                  presaturated aggregates

(e)                  all the above.

Sollution

(e)                  all the above.

Question no-13
in limit state of design of RCC Structures the probability of failure is in %


Optional Answers

(a)                  5

(b)                  2

(c)                  10

(d)                  6

(e)                  none of these

Sollution

(e)                  none of these

Question no-14
as per IS 10262 1983, % of air content in concrete for 20mm aggregates


Optional Answers

(a)                  1

(b)                  3

(c)                  4

(d)                  8

(e)                  2

Sollution

(e)                  2

Question no-15
as per IS 10262 2009, % of air content in concrete for 20mm aggregates


Optional Answers

(a)                  2

(b)                  4

(c)                  6

(d)                  8

(e)                  none of these

Sollution

(e)                  none of these

Question no-16
14 days compression strength of PPC is


Optional Answers

(a)                  greater then OPC

(b)                  equal to OPC

(c)                  lower then OPC

(d)                  can not say anything

Sollution

(c)                  lower then OPC

Question no-17
28 days compression strength of PPC is


Optional Answers

(a)                  greater then OPC

(b)                  equal to OPC

(c)                  lower then OPC

(d)                  can not say anything

Sollution

(b)                  equal to OPC

Question no-18
90 days compression strength of PPC is


Optional Answers

(a)                  greater then OPC

(b)                  equal to OPC

(c)                  lower then OPC

(d)                  can not say anything

Sollution

(a)                  greater then OPC

Question no-19
the target strength of M45 grade of concrete


Optional Answers

(a)                  53.25

(b)                  51

(c)                  45

(d)                  55

(e)                  none of these

Sollution

(a)                  53.25

Question no-20
size of cube use for comprehensive strength of cement in mm


Optional Answers

(a)                  70.6

(b)                  150

(c)                  100

(d)                  75

(e)                  89

Sollution

(a)                  70.6

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