Important Practice Question Available for Exam. This Questions are based on Repeated Topics and Frequently Ones with the Help of this you can Score Good Marks in Exam and you will Pass in Exam.
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1. Attempt any FIVE of the
following: 10
a) List four physical properties
of OPC.
b) Define bulking of sand.
c) State Duff Abraham’s water
cement ratio law. ***
d) Name four methods / affecting
of concrete mix design. ***
e) In sequence, Draw & write concreting
operations. *
f) State two purposes of using
accelerating admixtures in the concrete. **
g) State two uses of low heat
cement.
h) Define hydration of cement.
2. Attempt any THREE of the
following: 12
a) Explain the method to determine
initial and final setting time of cement.
b) Classify the aggregate based on
its size and shape. **
c) Calculate the average crushing
value of aggregate using following data and write its suitability. *
d) A sand sample has a fineness
modulus of 1.95. Whether this sand can be used for concreting? Explain the
procedure to bring the fineness modulus in required permissible limits. State
its
importance.**
e) Explain the procedure to
determine fineness of cement by dry sieving method. State its IS requirement.*
f) List four substances in water
having deleterious effects. State their effects on concrete.
g) Explain determination of
bulking of fine aggregate with neat sketch.*
h) Explain procedure to find
specific gravity of the fine aggregate in laboratory
i) Explain flakiness index and
elongation index in detail.
3. Attempt any THREE of the
following: 12
a) Suggest the compaction factor
for following degree of workability. **
(i)
Medium
(ii)
High
(iii)
Very low
(iv)
Low
b) Illustrate the effect of properties
of coarse aggregates on compressive strength of concrete.**
c) Explain the procedure for
measurement of workability of fresh concrete using slump cone test.
d) Explain the necessity of
supervision for concreting operations (any four)
e) Suggest the degree of
workability in terms of slump for the following:
(i)
Pavements using pavers.
(ii)
Canal lining.
(iii)
Heavily reinforced sections
(iv)
In-situ piling
f) Explain two causes of each
(i)
Seggregation
(ii)
Bleeding of concrete. *
g) Explain two factors affecting
properties of hardened concrete.
h) Calculate quantity of water to
be added for costing cubes in laboratory by 12.5 kg cement, if w/c ratio 0.45.
i) Suggest the minimum grade of
concrete for following exposure condition.
(i)
RCC work
(ii)
Water retaining structure.
(iii)
Sea water construction
(iv)
Prestressed concrete.
4. Attempt any THREE of the
following: 12
a) Explain the importance and
Effect of water / cement ratio in the concrete mix. **
b) Write four objectives of
concrete mix design. ***
c) Describe four characteristics
of ready mix concrete.
d) Explain four effects of hot and
cold weather on concrete. **
e) Explain & Write two
advantages and two disadvantages of vacuum de-watered concrete floor. *
f) Define the following special
types of concretes with its one use.
(i)
Vacuum concrete
(ii)
Fiber reinforced concrete. *
(iii)
High performance concrete
(iv)
Self compacting concrete.
5. Attempt any TWO of the
following: 12
a) Explain the laboratory
procedure to determine the compressive strength of concrete cubes as per
IS-516-1959 with reference to following points: **
(i)
preparation of test specimen
(ii)
Procedure of testing
(iii)
Interpretation of results.
b) Explain the rebound hammer **
test procedure and show the relationship between compressive strength and
rebound number with hammer horizontal and vertical on a dry and wet surface
of concrete.**
c) Explain the ultrasonic pulse
velocity test and techniques of measuring pulse velocity through concrete. **
d) Write one suitability of each
different six non- destructive tests.
6. Attempt any TWO of the
following: 12
a) Write four requirements of good
formwork and draw a sketch showing cross section of formwork for a L-shaped
column.
b) Suggest one type of materials
for water proofing for the following situations: *
(i)
Rising dampness in building
(ii)
Leakages in dam
(iii)
Concrete continuously in wet or damp condition.
(iv)
Leakages in lavatory, bathroom and kitchen floor
(v)
Cracks on plastered surface
(vi)
Cracks on roof surface
c) Suggest the type of joints in
concrete when it is likely to increase in volume due to temperature change.
Explain it and draw its neat sketch. **
d) Explain the significance of
batching, compaction and curing of concrete.
e) Draw neat and labelled sketches
of following:
(i)
Plan of column formwork.
(ii)
Expansion joint with load transfer device.
f) (i) Suggest the relevant method
of water - proofing used for following construction.
1)
Basements of buildings.
2)
Swimming pool.
3)
Water tank.
(ii) Suggest the relevant method of transportation of concrete used for
construction in following situation. *
1)
Concreting in hilly areas.
2)
Concreting of highrise building.
3)
Concreting under water.
g) Classify the methods of curing
of concrete with detail explanation of any one method.
h) State the requirement of good
form work and state the stripping time of form work as per IS 456-2000.
(i)
Slab
(ii)
Beam
(iii)
Column
with labelling on sketch.
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