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Home⇒ Engineering⇒
Concrete technology rcc
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ If the depth of neutral axis for a singly reinforced rectangular section is represented by kd in working stress design, then the value of k for balanced section depends on as, only [other wrong options] [Discuss in forum] depends on aCbC only depends on both crst and acbc is independant of both ast and acbc where d is the effective depth, ast is per-missible stress in steel in tension and ocbc is permissible stress in concrete in bend¬ing compression. |
Q22 ⇒ Concrete mainly consists of. all the above. [other wrong options] [Discuss in forum] cement aggregates admixture |
Q23 ⇒ Minimum thickness of load bearing RCC wall should be. 100 mm [other wrong options] [Discuss in forum] 50 mm 150 mm 200 mm |
Q24 ⇒ If the permissible stress in steel in tension is 140 N/mm2, then the depth of neutral axis for a singly reinforced rectangular balanced section will be 0.40 d [other wrong options] [Discuss in forum] 0.35 d 0.45 d dependent on grade of concrete also |
Q25 ⇒ According to the recommendations of IS : 456-1978, the expansion joints. all the above. [other wrong options] [Discuss in forum] are provided where plane changes abruptly are provided to ensure minimum resistance are supported on separate columns |
Q26 ⇒ When shear stress exceeds the permissible limit in a slab, then it is reduced by. increasing the depth [other wrong options] [Discuss in forum] providing shear reinforcement using high strength steel using thinner bars but more in number |
Q27 ⇒ Modulus of elasticity of steel as per IS : 456-1978 shall be taken as 200kN/mm2 [other wrong options] [Discuss in forum] 20 kN/cm2 200 kN/cm2 2xl06N/cm2 |
Q28 ⇒ Hardening of cement occurs at. none of these. [other wrong options] [Discuss in forum] rapid rate during the first few days and afterwards it continues to increase at a decreased rate slow rate during the first few days and afterwards it continues to increase at a rapid rate uniform rate throughout its age |
Q29 ⇒ Due to circumferential action of the spiral in a spirally reinforced column. both the capacity of column and ductility of column increase [other wrong options] [Discuss in forum] capacity of column is decreased ductility of column reduces capacity of column is decreased but ductility of column increases |
Q30 ⇒ Minimum grade of concrete to be used in reinforced concrete as per IS:456-1978 is M15 [other wrong options] [Discuss in forum] M20 M 10 M25 |
Q31 ⇒ For construction of structures in sea water, the cement generally preferred to, is. Portland-pozzolana cement [other wrong options] [Discuss in forum] quick setting cement low heat Portland cement rapid hardening cement |
Q32 ⇒ In counterfort retaining walls, the main reinforcement in the stem at support is. provided only on inner face [other wrong options] [Discuss in forum] not provided provided only on front face provided both on inner and front faces |
Q33 ⇒ Maximum quantity of water needed per 50 kg of cement for M 15 grade of concrete is 32 litres [other wrong options] [Discuss in forum] 28 litres 30 litres 34 litres |
Q34 ⇒ For compacting plain concrete road surface of thickness less than 20 cm, we use. screed vibrator [other wrong options] [Discuss in forum] internal vibrator form vibrator none of these. |
Q35 ⇒ According to Whitney's theory, depth of stress block for a balanced section of a concrete beam is limited to. 0.537 d [other wrong options] [Discuss in forum] 0.43 d 0.68 d 0.85 d |
Q36 ⇒ In case of hand mixing of concrete, the extra cement to be added is 10% [other wrong options] [Discuss in forum] 5% 15% 20% |
Q37 ⇒ Pick up the incorrect statement from the following: A rich mix of concrete possesses higher strength than that a lean mix of desired workability with excessive equantity of water [other wrong options] [Discuss in forum] The strength of concrete decreases as the water cement ratio increases If the water cement ratio is less than 0.45, the concrete is not workable and causes honey-combed structure None of these. |
Q38 ⇒ The maximum value of hoop compression in a dome is given by. wR/2d [other wrong options] [Discuss in forum] wR / 4d wR/d 2wR/d |
Q39 ⇒ For walls, columns and vertical faces of all structural members, the form work is generally removed after 24 to 48 hours [other wrong options] [Discuss in forum] 3 days 7 days 14 days |
Q40 ⇒ The light weight aggregates are obtained from. volcanic source. [other wrong options] [Discuss in forum] sedimentary rocks metamorphic rocks igneous rocks |
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