30 real Bridges & Prestressed Concrete questions from the Civil Design & Codes bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.
1. What is IRC Class A loading?
Junior
A.heavy 700 kN tracked vehicle or 1000 kN seven-axle wheeled train specified for bridges on National and State Highways in addition to Class A
B.IRC 78 takes normal scour dsm = 1.34 (Db²/Ksf)^(1/3) and maximum scour as 2 dsm at piers and 1.27 dsm at abutments
C.unified limit state code for concrete road bridges that replaced IRC 21 and IRC 18, using γc 1.5 and γs 1.15 with grades up to M90
D.standard two-lane train of 114, 114, 68, 68, 68, 68, 27 and 27 kN axles totalling 554 kN, applied to all permanent bridges
A.IRC Class A loading — standard two-lane train of 114, 114, 68, 68, 68, 68, 27 and 27 kN axles totalling 554 kN, applied to all permanent bridges
B.IRC Class A loading — strands tensioned against abutments before concreting and released after hardening so bond transfers force, used for factory precast sleepers and girders
C.IRC Class A loading — asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
D.IRC Class A loading — IRC 78 takes normal scour dsm = 1.34 (Db²/Ksf)^(1/3) and maximum scour as 2 dsm at piers and 1.27 dsm at abutments
A.elastic shortening, creep, shrinkage and relaxation in all systems, plus friction and anchorage slip in post-tensioning, totalling about 15 to 20 percent
B.heavy 700 kN tracked vehicle or 1000 kN seven-axle wheeled train specified for bridges on National and State Highways in addition to Class A
C.IRC 78 takes normal scour dsm = 1.34 (Db²/Ksf)^(1/3) and maximum scour as 2 dsm at piers and 1.27 dsm at abutments
D.strands tensioned against abutments before concreting and released after hardening so bond transfers force, used for factory precast sleepers and girders
5. Which term means: "heavy 700 kN tracked vehicle or 1000 kN seven-axle wheeled train specified for bridges on National and State Highways in addition to Class A"?
A.IRC Class 70R loading — IRC 5 raises minimum clearance with discharge, from 600 mm for 3 to 30 cumec up to 1500 mm above 3000 cumec
B.IRC Class 70R loading — elastomeric pads for spans to about 30 m, POT-PTFE and spherical bearings for heavy loads and large rotations, all per IRC 83
C.IRC Class 70R loading — unified limit state code for concrete road bridges that replaced IRC 21 and IRC 18, using γc 1.5 and γs 1.15 with grades up to M90
D.IRC Class 70R loading — heavy 700 kN tracked vehicle or 1000 kN seven-axle wheeled train specified for bridges on National and State Highways in addition to Class A
A.IRC 5 raises minimum clearance with discharge, from 600 mm for 3 to 30 cumec up to 1500 mm above 3000 cumec
B.strands tensioned against abutments before concreting and released after hardening so bond transfers force, used for factory precast sleepers and girders
C.IRC 78 takes normal scour dsm = 1.34 (Db²/Ksf)^(1/3) and maximum scour as 2 dsm at piers and 1.27 dsm at abutments
D.unified limit state code for concrete road bridges that replaced IRC 21 and IRC 18, using γc 1.5 and γs 1.15 with grades up to M90
8. Which term means: "strands tensioned against abutments before concreting and released after hardening so bond transfers force, used for factory precast sleepers and girders"?
A.Pre-tensioning — IRC 78 takes normal scour dsm = 1.34 (Db²/Ksf)^(1/3) and maximum scour as 2 dsm at piers and 1.27 dsm at abutments
B.Pre-tensioning — strands tensioned against abutments before concreting and released after hardening so bond transfers force, used for factory precast sleepers and girders
C.Pre-tensioning — asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
D.Pre-tensioning — standard two-lane train of 114, 114, 68, 68, 68, 68, 27 and 27 kN axles totalling 554 kN, applied to all permanent bridges
A.asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
B.IRC 5 raises minimum clearance with discharge, from 600 mm for 3 to 30 cumec up to 1500 mm above 3000 cumec
C.tendons in ducts stressed against anchorages after concrete gains strength and then grouted, suited to long-span in-situ and segmental bridges
D.strands tensioned against abutments before concreting and released after hardening so bond transfers force, used for factory precast sleepers and girders
11. Which term means: "tendons in ducts stressed against anchorages after concrete gains strength and then grouted, suited to long-span in-situ and segmental bridges"?
A.Post-tensioning — asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
B.Post-tensioning — tendons in ducts stressed against anchorages after concrete gains strength and then grouted, suited to long-span in-situ and segmental bridges
C.Post-tensioning — unified limit state code for concrete road bridges that replaced IRC 21 and IRC 18, using γc 1.5 and γs 1.15 with grades up to M90
D.Post-tensioning — IRC 78 takes normal scour dsm = 1.34 (Db²/Ksf)^(1/3) and maximum scour as 2 dsm at piers and 1.27 dsm at abutments
A.IRC 78 takes normal scour dsm = 1.34 (Db²/Ksf)^(1/3) and maximum scour as 2 dsm at piers and 1.27 dsm at abutments
B.standard two-lane train of 114, 114, 68, 68, 68, 68, 27 and 27 kN axles totalling 554 kN, applied to all permanent bridges
C.strands tensioned against abutments before concreting and released after hardening so bond transfers force, used for factory precast sleepers and girders
D.elastic shortening, creep, shrinkage and relaxation in all systems, plus friction and anchorage slip in post-tensioning, totalling about 15 to 20 percent
14. Which term means: "elastic shortening, creep, shrinkage and relaxation in all systems, plus friction and anchorage slip in post-tensioning, totalling about 15 to 20 percent"?
A.Prestress losses — elastic shortening, creep, shrinkage and relaxation in all systems, plus friction and anchorage slip in post-tensioning, totalling about 15 to 20 percent
B.Prestress losses — standard two-lane train of 114, 114, 68, 68, 68, 68, 27 and 27 kN axles totalling 554 kN, applied to all permanent bridges
C.Prestress losses — strands tensioned against abutments before concreting and released after hardening so bond transfers force, used for factory precast sleepers and girders
D.Prestress losses — IRC 5 raises minimum clearance with discharge, from 600 mm for 3 to 30 cumec up to 1500 mm above 3000 cumec
A.elastic shortening, creep, shrinkage and relaxation in all systems, plus friction and anchorage slip in post-tensioning, totalling about 15 to 20 percent
B.unified limit state code for concrete road bridges that replaced IRC 21 and IRC 18, using γc 1.5 and γs 1.15 with grades up to M90
C.IRC 5 raises minimum clearance with discharge, from 600 mm for 3 to 30 cumec up to 1500 mm above 3000 cumec
D.standard two-lane train of 114, 114, 68, 68, 68, 68, 27 and 27 kN axles totalling 554 kN, applied to all permanent bridges
17. Which term means: "unified limit state code for concrete road bridges that replaced IRC 21 and IRC 18, using γc 1.5 and γs 1.15 with grades up to M90"?
A.IRC 112 — heavy 700 kN tracked vehicle or 1000 kN seven-axle wheeled train specified for bridges on National and State Highways in addition to Class A
B.IRC 112 — asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
C.IRC 112 — unified limit state code for concrete road bridges that replaced IRC 21 and IRC 18, using γc 1.5 and γs 1.15 with grades up to M90
D.IRC 112 — tendons in ducts stressed against anchorages after concrete gains strength and then grouted, suited to long-span in-situ and segmental bridges
A.elastic shortening, creep, shrinkage and relaxation in all systems, plus friction and anchorage slip in post-tensioning, totalling about 15 to 20 percent
B.unified limit state code for concrete road bridges that replaced IRC 21 and IRC 18, using γc 1.5 and γs 1.15 with grades up to M90
C.elastomeric pads for spans to about 30 m, POT-PTFE and spherical bearings for heavy loads and large rotations, all per IRC 83
D.tendons in ducts stressed against anchorages after concrete gains strength and then grouted, suited to long-span in-situ and segmental bridges
A.Bridge bearings — heavy 700 kN tracked vehicle or 1000 kN seven-axle wheeled train specified for bridges on National and State Highways in addition to Class A
B.Bridge bearings — elastic shortening, creep, shrinkage and relaxation in all systems, plus friction and anchorage slip in post-tensioning, totalling about 15 to 20 percent
C.Bridge bearings — elastomeric pads for spans to about 30 m, POT-PTFE and spherical bearings for heavy loads and large rotations, all per IRC 83
D.Bridge bearings — tendons in ducts stressed against anchorages after concrete gains strength and then grouted, suited to long-span in-situ and segmental bridges
23. Which term means: "asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts"?
A.Expansion joints — unified limit state code for concrete road bridges that replaced IRC 21 and IRC 18, using γc 1.5 and γs 1.15 with grades up to M90
B.Expansion joints — heavy 700 kN tracked vehicle or 1000 kN seven-axle wheeled train specified for bridges on National and State Highways in addition to Class A
C.Expansion joints — asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
D.Expansion joints — strands tensioned against abutments before concreting and released after hardening so bond transfers force, used for factory precast sleepers and girders
A.Vertical clearance above HFL — elastomeric pads for spans to about 30 m, POT-PTFE and spherical bearings for heavy loads and large rotations, all per IRC 83
B.Vertical clearance above HFL — IRC 5 raises minimum clearance with discharge, from 600 mm for 3 to 30 cumec up to 1500 mm above 3000 cumec
C.Vertical clearance above HFL — asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
D.Vertical clearance above HFL — heavy 700 kN tracked vehicle or 1000 kN seven-axle wheeled train specified for bridges on National and State Highways in addition to Class A
A.elastic shortening, creep, shrinkage and relaxation in all systems, plus friction and anchorage slip in post-tensioning, totalling about 15 to 20 percent
B.IRC 78 takes normal scour dsm = 1.34 (Db²/Ksf)^(1/3) and maximum scour as 2 dsm at piers and 1.27 dsm at abutments
C.asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
D.elastomeric pads for spans to about 30 m, POT-PTFE and spherical bearings for heavy loads and large rotations, all per IRC 83
A.Design scour depth — IRC 78 takes normal scour dsm = 1.34 (Db²/Ksf)^(1/3) and maximum scour as 2 dsm at piers and 1.27 dsm at abutments
B.Design scour depth — strands tensioned against abutments before concreting and released after hardening so bond transfers force, used for factory precast sleepers and girders
C.Design scour depth — asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
D.Design scour depth — elastomeric pads for spans to about 30 m, POT-PTFE and spherical bearings for heavy loads and large rotations, all per IRC 83
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