1. Which one of these is
not a workability test for concrete?
a. Flow table test
b. Vee bee consistometer
test
c. Slump test
d. Shear box test
Accepted Answers:
Shear box test
2. Bulking of sand is the
a) Rolling
of heavy weight roller on sand
b) Increase
in volume of sand due to moisture
c) Segregating
of water from wet sand
d) Decrease
in volume of sand
Accepted Answers:
Increase in volume of
sand due to moisture
3 Loss in weight in the test for loss on
ignition of OPC should be less than
a) 4%
b) 5%
c) 6%
d) 0%
Accepted Answers:
4%
4 In cement manufacturing, gypsum is used as a:
a) Set
regulator
b) Water
reducer
c) Heat
controller
d) None
Accepted Answers:
Set regulator
5 The decreasing order of
the rate of hydration for Bogue’s compounds of cement is
a) C2S,
CSH and C3A
b) C2S,
C3S and C3A
c) C3A,
C3S and C2S
d) C3A,
C3S and CH
Accepted Answers:
C3A, C3S
and C2S
6.
Which of the following statement for a concrete specimen is true
a) Cube
strength = cylinder strength
b) Cube
strength = 0.85 times cylinder strength
c) Cylinder
strength = 0.85 times cube strength
d) Cylinder
strength = 1.2 times cube strength
Accepted
Answers:
Cylinder
strength = 0.85 times cube strength
7
Deformation due to sustained loading is termed as:
a) Shrinkage
b) Efflorescence
c) Fatigue
d) Creep
Accepted
Answers:
Creep
8 Which of the following is not a mineral
admixture for concrete?
a) Fly
ash
b) Copper
slag
c) Blast
furnace slag
d) Silica
fume
Accepted
Answers:
Copper
slag
9 When a rebar corrodes within a concrete,
its volume
a) Increases
b) Decreases
c) Remains
the same
d) Decreases
initially and then increases
Accepted
Answers:
Increases
10
U- box is a test for measuring the ________ of self-compacting concrete
a) Workability
b) Passing
ability
c) Segregation
potential
d) Flexural
strength
Accepted
Answers:
Passing
ability
11
αC2S
is present in
a) Modern
clinker
b) Aspdin’s
clinker
c) Both
clinkers
d) Not
present in any clinker
e)
Accepted Answers:
Modern clinker
12 Excess free
lime in OPC causes
a) Increase
in compressive strength
b) Prolonged
final setting time
c) Unsoundness
of cement
d) Lower
heat of hydration
Accepted Answers:
Unsoundness of cement
13 In modern clinker the alite size is reduced and
belite size has increased because
a) To
increase the reactivity of alite and uniform and complete burning in rotary
kiln leads to larger crystal sizes of belite
b) To
increase the reactivity of belite and uniform and complete burning in rotary
kiln leads to smaller crystal sizes of alite
c) The
modern clinker production process needs slower burning rate and so alite size
is reduced and belite size increased
d) Both
a and c
Accepted Answers:
To increase the reactivity of alite and
uniform and complete burning in rotary kiln leads to larger crystal sizes of
belite
14 As per IS
269, a maximum of 5% of performance enhancer can be added, it is called
performance enhancer because
a) It
increases the strength of the concrete
b) It
increases efficiency (net energy emission and cost) of cement production mill
c) It
decreases the pollution caused by cement mill
d) All
of the above
Accepted Answers:
It increases efficiency (net energy
emission and cost) of cement production mill
15 The two
primary ternary systems existing for cement are
a) CaO-SiO2-Al2O3
b) SiO2-Al2O3-Fe2O3
c) CaO-Al2O3-Fe2O3
d) CaO-SiO2-
Fe2O3
Accepted Answers:
CaO-SiO2-Al2O3
CaO-Al2O3-Fe2O3
16 The
assumption(s) in Bogue equation is(are)
a) No
secondary mineral present
b) A/F>0.64
c) All
aluminoferrites are not in the form of C4AF
d) Accounts
for free lime
e) System
is in equilibrium
Accepted Answers:
No secondary mineral present
A/F>0.64
System is in equilibrium
17 The
rotary kiln is generally made of steel, which fails at high temperature. The
interior is insulated using __________ (i) and _______________(ii).
(i) Firebrick; (ii) Calcium Silicate
(i) Firebrick; (ii) Ceramic Fiber
(i) Ceramic Fiber; (ii) Calcium Silicate
(i) Firebrick; (ii) Refractory Brick
(i) Refractory Brick; (ii) Insulating Wool
Accepted Answers:
(i) Firebrick; (ii) Refractory Brick
18 The
cyclonic separators introduced in cement production before feeding raw
materials into the kiln are known as:
Electrostatic Precipitators
Bag Filters
Grate Coolers
Preheaters
Scrubbers
Accepted Answers:
Preheaters
19 Which
of the following are names given to the zones in the rotary kiln in cement
production?
Hydration zone
Dehydration zone
Clinkering zone
Calcining zone
Cooling zone
Accepted Answers:
Dehydration zone
Clinkering zone
Calcining zone
Cooling zone
No comments:
Post a Comment