500 Best Concrete Technology- MCQ
Q169). In transportation of concrete by pumps
a).The slump should not be less than 50 mm and more than 80 mm
b).The water cement ratio should remain between 0.5 to 0.65
c).The number of bends in a pipe line should be as small as possible
d).All of the above
Correct Answer:
All of the above
Explanation:
Q170). The diameter of the pipe line used for transportation of concrete by pumps should not exceed
a).10 cm
b).20 cm
c).30 cm
d).40 cm
Correct Answer:
30 cm
Explanation:
Q171). To prevent segregation, the concrete should not be thrown from a height of more than
a).0.5 m
b).1 m
c).1.5 m
d).2 m
Correct Answer:
1 m
Explanation:
Q172). The process of consolidating concrete mix after placing it in position is termed as
a).Curing
b).Wetting
c).Compaction
d).none of these
Correct Answer:
Compaction
Explanation:
Q173). When the concrete mix is too wet, it causes
a).Segregation
b).low density
c).Excess laitance at the top
d).All of these
Correct Answer:
All of these
Explanation:
Q174). The objective of compaction is to
a).eradicate air holes
b).give maximum density
c).ensure intimate contact between the concrete and the surface of reinforcement
d).all of the above
Correct Answer:
all of the above
Explanation:
Q175). The factor which affect the quality of compaction, is
a).density of concrete
b).strength of concrete
c).durability of concrete
d).all of these
Correct Answer:
all of these
Explanation:
Q176). For compacting large sections of mass concrete in structures, the type of vibrator used is
a).internal vibrator
b).screed vibrator
c).form vibrator
d).all of these
Correct Answer:
internal vibrator
Explanation: