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Concrete Technology
Comments
Question
A flaky aggregate is said to be elongated if its length is
Options
A. equal to the mean size
B. twice the mean size
C. thrice the mean size
D. four times the mean size
E. five times the mean size.
Correct Answer
twice the mean size
Concrete Technology problems
Search Results
1. Setting time of cement increases by adding
Options
A. gypsum
B. hydrogen peroxide
C. calcium chloride
D. sodium oxide
E. none of these.
Show Answer
Scratch Pad
Discuss
Correct Answer: gypsum
2. Strength of concrete with passage of time
Options
A. increases
B. decreases
C. fluctuates
D. remains constant.
Show Answer
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Discuss
Correct Answer: increases
3. The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity dams should be
Options
A. between 150 to 300 kg/cm
2
B. between 350 to 600 kg/cm
2
C. between 150 to 500 kg/cm
2
D. below 200 kg/cm
2
E. none of these.
Show Answer
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Discuss
Correct Answer: below 200 kg/cm
2
4. Permissible compressive strength of M 200 concrete grade is
Options
A. 100 kg/cm
2
B. 150 kg/cm
2
C. 200 kg/cm
2
D. 250 kg/cm
2
E. 300 kg/cm
2
Show Answer
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Discuss
Correct Answer: 200 kg/cm
2
5. Cement used for normal concrete construction, is obtained by burning a mixture of
Options
A. silicious and argillaceous materials
B. argilaceous and calcareous materials
C. silicious and catcareous materials
D. silicious, argillaceous and calcareous materials
E. none of these.
Show Answer
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Discuss
Correct Answer: silicious, argillaceous and calcareous materials
6. Higher workability of concrete is required if the structure is
Options
A. made with cement concrete
B. thick and reinfored
C. thin and heavily reinforced
D. thick and heavily reinfored.
Show Answer
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Discuss
Correct Answer: thick and heavily reinfored.
7. If P, Y and Z are the weights of cement, fine aggregates and coarse aggregates respetively and W/C is the water cement ratio, the minimum quantity of water to be added to first batch, is obtained by the equation
Options
A. 0.1
P
+ 0.3
Y
+ 0.1
Z
=
W/C
x
P
B. 0.3
P
+ 0.1
Y
+ 0.01
Z
=
W/C
x
P
C. 0.4
P
+ 0.2
Y
+ 0.01
Z
=
W/C
x
P
D. 0.5
P
+ 0.3
Y
+ 0.01
Z
=
W/C
x
P
E. 0.2
P
+ 0.5
Y
+ 0.1
Z
=
W/C
x
P
Show Answer
Scratch Pad
Discuss
Correct Answer: 0.3
P
+ 0.1
Y
+ 0.01
Z
=
W/C
x
P
8. Expansion joints are provided if the length of concrete structures exceeds
Options
A. 10 m
B. 15 m
C. 15 m
D. 35 m
E. 45 m
Show Answer
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Discuss
Correct Answer: 45 m
9. According to IS : 382-1963, a good aggregate should be
Options
A. chemically inert
B. sufficiently strong
C. hard and durable
D. all the above.
Show Answer
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Discuss
Correct Answer: all the above.
10. An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to be flaky if its least dimension is less than
Options
A. 22.5 mm
B. 18.5 mm
C. 16.5 mm
D. 15.5 mm
E. 13.5 mm.
Show Answer
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Discuss
Correct Answer: 13.5 mm.
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