Dubai Municipality Sample MCQs For Civil Engineer
The Dubai Municipality Exam for Civil Engineers is a certification test that civil engineers must pass to work professionally in Dubai . The Dubai Municipality administers the?exam to ensure that engineers meet the local standards of technical competence and adhere to safety regulations and building codes. It assesses an engineer’s knowledge of structural design, construction management, environmental engineering, and local laws. Passing this exam is essential for obtaining a professional license to work as a civil engineer in Dubai.
Importance of Sample MCQs in Preparation
Sample MCQs are essential for exam preparation as they provide insight into the exam's structure and format, helping candidates become familiar with question types.MCQs also facilitate self-assessment, enabling candidates to identify strengths and weaknesses. Overall, incorporating MCQs is key to building the skills and confidence necessary for success in the Dubai Municipality Exam.
Sample MCQs for G1 and G4 Categories
For G1:
1. What is the recommended de-shuttering time for the sides of a concrete column under normal conditions?
a) 12 hours b) 24 hours c) 3 days d) 7 days
2. What is the minimum period before striking formwork for vertical surfaces such as columns and walls?
A. 12 hours B. 16-24 hours C. 48 hours D. 72 hours
3. According to ACI 318, the minimum time before removing formwork from a non-cantilever slab is:
A) 3 days B) 7 days C) 14 days D) 28 days
4. When should the soffit formwork for slabs be removed?
A. 1 day B. 3 days C. 7 days D. 14 days
5. What is the recommended time to keep props under slabs spanning up to 4.5 m after the formwork is removed?
A. 7 days B. 14 days C. 21 days D. 28 days
6. According to the Dubai Building Code, what is the minimum compressive strength required for concrete used in precast structural elements?
A) 20 N/mm2 B) 30 N/mm2 C) 40 N/mm2 D) 50 N/mm2
7. What is the minimum effective pre-compression required for two-way slabs with varying cross-sections along the span, as per ACI 318-19?
A) 0.5 N/mm2 B) 0.7 N/mm2 C) 0.9 N/mm2 D) 1.2 N/mm2
8. What is the density of typical granite stone used in construction?
A) 2000-2400 kg/m3 B) 2400-2800 kg/m3 C) 2800-3200 kg/m3 D) 3200-3600 kg/m3
9. When should the compressive strength test be conducted on concrete samples?
a) Immediately after mixing b) After 7 days of curing c) After 28 days of curing d) When the concrete is set but not cured
10. In the context of soil tests, what is the maximum particle size allowed for backfill material used in pile foundations as per the Dubai Building Code?
a) 50 mm b) 60 mm c) 75 mm d) 100 mm
11. What is the minimum reinforcement requirement for the top region of a pile below the caps or raft, according to the Dubai Building Code?
a) Stirrups spaced at 200 mm b) Stirrups spaced at 150 mm c) Stirrups spaced at 100 mm d) Stirrups spaced at 75 mm
12. According to the Dubai Building Code, what should be the minimum thickness of backfill layers before compaction?
a) 100 mm to 150 mm b) 150 mm to 250 mm c) 200 mm to 300 mm d) 250 mm to 350 mm
13. The Dubai Building Code suggests a minimum of how many percent of the pile length should be tested using Cross-hole Sonic Logging for piles of more than 1 m diameter.
a) 5% b) 10% c) 15% d) 20%
14. According to the Dubai Building Code, what is the recommended design life for temporary structures?
A) 5 years B) 10 years C) 15 years D) 20 years
15. What is the design life range specified for replaceable structural parts, such as bearings and gantry, in the Dubai Building Code?
A) 5 to 15 years B) 10 to 20 years C) 10 to 25 years D) 15 to 30 years
16. What is the recommended design life for agricultural and similar structures according to the Dubai Building Code?
A) 10 to 20 years B) 15 to 25 years C) 15 to 30 years D) 20 to 35 years
17. What is the recommended design life for standard buildings according to the Dubai Building Code?
A) 25 years B) 30 years C) 40 years D) 50 years
18. Which of the following structure types is recommended to have a design life of 100 years according to the Dubai Building Code?
A) Temporary structures B) Replaceable structural parts C) Agricultural structures D) Special structures (e.g., buildings higher than 300 m, monumental buildings)
19. Which of the following is the minimum thickness required for steel plates used in built-up sections according to the Dubai Building Code?
A) 3 mm B) 5 mm C) 6 mm D) 8 mm
20. For a simply supported beam with a uniformly distributed load w and a span L, the maximum shear force is:
(a) wL/2 (b) wL/4 (c) wL/8 (d) wL
21. What is the typical density range of structural steel used in construction?
a) 5000-6000 kg/m3 b) 6000-7000 kg/m3 c) 7750- 8100 kg/m3 d) 8000-9000 kg/m3
22. The Bending Moment at point D for the shown figure is
a) 0 b) WL 8 c) WL2 2 d) WH2 2
23. The formwork removal for footings, foundations, and mass concrete structures is generally done:
(A) 12-16 hours (B) 24-48 hours (C) 3-5 days (D) 7-10 days
24 Which method is commonly used to achieve a smooth finish on freshly laid concrete surfaces?
a) Screeding b) Brooming c) Troweling d) Floating
25. According to the Dubai Building Code, what is the minimum compressive strength for concrete used in structural elements?
A) 20 N/mm2 B) 25 N/mm2 C) 28 N/mm2 D) 35 N/mm2
26. Which type of pile is commonly used in marine and offshore structures for resisting both vertical and horizontal loads?
(A) Precast concrete pile (B) H-pile (C) Composite pile (D) Steel tubular pile
Answers:
1. Answer: b) 24 hours
Explanation: Under normal conditions, the vertical formwork for columns can generally be removed after 16-24 hours, allowing the concrete to set and gain initial strength.
2. Answer:?B. 16-24 hours
Explanation:?IS 456:2000 specifies that vertical formwork for columns, walls, and beams can typically be removed after 16 to 24 hours, provided that the concrete has gained enough strength to support itself.
3. Answer:?A) 3 days
Explanation:?ACI 318 specifies that formwork for non-cantilever slabs can be removed after a minimum of 3 days, provided that the concrete has reached sufficient strength and the props are re-fixed to support the slab.
4. Answer b. 3 days
Explanation:?Soffit formwork for slabs should be removed after a minimum of 3 days, allowing the concrete to cure adequately while still ensuring that it can support any loads placed upon it.
5. Answer:?A. 7 days
Explanation:?Props supporting slabs that span up to 4.5 m should remain in place for at least 7 days after the removal of the formwork to ensure the concrete has sufficient strength and stability.
6. Answer: C) 40 N/mm2 Explanation: The concrete used for precast structural elements must have a compressive strength of at least 40 N/mm2 measured at 28 days. A lower strength may be accepted if its suitability is demonstrated and approved by the Authority.
7. Answer: C) 0.9 N/mm2
Explanation: For two-way slabs with varying cross-sections along the slab span, the tendons must provide an effective pre-compression of 0.9 N/mm2.
8. Answer:?B) 2400-2800 kg/m3
Explanation:?Granite stone typically has a density ranging from 2400 to 2800 kg/m3, making it a heavy and durable material for construction
9. Answer: c) After 28 days of curing
Explanation: The compressive strength test on concrete samples is typically conducted after 28 days of curing, as this period allows the concrete to reach its designed strength. Testing at this age provides a standard measure of the concrete's strength and durability.
10. Answer: c) 75 mm
Explanation: The maximum particle size for backfill material is limited to 75 mm to ensure uniform compaction and avoid the inclusion of oversized particles that could lead to voids and reduced compaction efficiency.
11. Answer: c) Stirrups spaced at 100 mm
Explanation: The code requires closely spaced stirrups, typically at 100 mm, in the top region of the pile below the caps or raft to ensure confinement and enhance the pile's structural capacity, particularly in regions subjected to high stress.
12. Answer: b) 150 mm to 250 mm
Explanation: The backfill material must be placed in layers of 150 mm to 250 mm thickness before compaction, allowing for uniform compaction and ensuring the stability of the foundation system.
13. Answer: b) 10%
Explanation: Cross-hole Sonic Logging is required for at least 10% of piles with a diameter greater than 1 m to assess the integrity of the pile and identify any defects or anomalies along the pile length.
14. Answer: B) 10 years
Explanation: Temporary structures are recommended to have a design life of 10 years according to the Dubai Building Code.
15. Answer: C) 10 to 25 years
Explanation: Replaceable structural parts, like bearings and gantries, are recommended to have a design life of 10 to 25 years.
16. Answer: C) 15 to 30 years
Explanation: Agricultural and similar structures are recommended to have a design life of 15 to 30 years.
17. Answer: D) 50 years
Explanation: Standard buildings are recommended to have a design life of 50 years.
18. Answer: D) Special structures (e.g., buildings higher than 300 m, monumental buildings) Explanation: Special structures, such as buildings higher than 300 meters, monumental buildings, or structures designated as essential for the community, are recommended to have a design life of 100 years.
19. Answer: C) 6 mm
Explanation: The Dubai Building Code specifies that the minimum thickness for steel plates used in built-up sections should be 6 mm.
20. Answer is a. wL/2
For a simply supported beam subjected to a uniformly distributed load?ww?over the entire span?LL, the maximum shear force occurs at the supports and is given by:(a)?wL/2
21. Answer is c) 7750- 8100 kg/m3
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Explanation: The typical density range of structural steel used in construction is between?7750 kg/m3 and 8100 kg/m3. This range is commonly accepted in the industry and reflects the properties of various grades of structural steel, which are primarily composed of iron and carbon
22. Answer a. 0
23. Answer: (B) 24-48 hours
Explanation: The formwork is usually removed after 24 hours for footings, foundations, and mass concrete structures, as these structures are in compression and gain strength relatively quickly.
24. Answer: c) Troweling
Explanation: Troweling is smoothing and finishing the surface of freshly laid concrete using a trowel. This process provides a dense, smooth, and durable finish to the concrete surface.
25. Answer: D) 35 N/mm2
Explanation: Structural concrete elements must have a minimum compressive strength of 35 N/mm2 as per the Dubai Building Code
26. Answer: (D) Steel tubular pile
Explanation: Steel tubular piles are widely used in marine and offshore structures because they can resist both vertical loads from the structure and horizontal loads from waves and currents.
For G4 :
1. According to the the Dubai Building Code, precast concrete elements should be designed and specified under:
A) Only ACI 318-19 B) Only PCI design handbook C) This subsection, ACI 318-19, and PCI design handbook D) Only this subsection
2. According to the Dubai Building Code, What is the minimum recommended slab thickness for post-tensioned systems?
A) 100 mm B) 150 mm C) 200 mm D) 250 mm
3. What is the minimum effective pre-compression required for two-way slabs with varying cross-sections along the span, as per ACI 318-19?
?A) 0.5 N/mm2 B) 0.7 N/mm2 C) 0.9 N/mm2 D) 1.2 N/mm2
4. What is the maximum spacing allowed for shear reinforcement in a beam as per ACI 318-19?
A. d/4 B. d/3 C. d/2 D. d
5. Concrete generally reaches about 70% of its compressive strength in:
(A) 7 days (B) 14 days (C) 21 days (D) 28 days
6. According to the Dubai Building Code, what is the maximum slope allowed for ramps in parking areas?
A) 1:8 B) 1:10 C) 1:12 D) 1:15
7. What is the required fire separation distance between two adjacent buildings according to the Dubai Building Code?
A) 2 meters B) 3 meters C) 4 meters D) 5 meters
8. Consider a fixed-end beam of span L subjected to a uniformly distributed load w. What is the fixed end moment at each support?
a) wL2/8 b) wL2/12 c) wL2/24 d) wL2/16
9. According to the Dubai Building Code, what is the minimum recommended clear concrete cover for reinforcement in superstructures?
A) 20 mm B) 30 mm C) 50 mm D) 75 mm
10. According to the Dubai Building Code, What is the minimum recommended clear concrete cover for reinforcement in substructures when concrete is cast directly against soil?
A) 30 mm B) 50 mm C) 75 mm D) 100 mm
11. What is the minimum recommended clear concrete cover for reinforcement in substructures when concrete is cast against blinding according to the Dubai Building Code?
A) 30 mm B) 50 mm C) 75 mm D) 100 mm
12. Which of the following correctly matches the specified strengths for concrete used in structural elements according to the Dubai Building Code?
?A) fcu = 35 N/mm2, f’c = 20 N/mm2 B) fcu = 35 N/mm2, f’c = 28 N/mm2 C) fcu = 28 N/mm2, f’c = 35 N/mm2 D) fcu = 20 N/mm2, f’c = 15 N/mm2
13. According to the Dubai Building Code, what is the minimum compressive strength for concrete used in structural elements?
A) 20 N/mm2 B) 25 N/mm2 C) 28 N/mm2 D) 35 N/mm2
14. What is the typical ratio of cement, sand, and coarse aggregate in a standard concrete mix design?
A) 1:2:4 B) 1:3:6 C) 1:1.5:3 D) 1:2:3
15. What is the most likely cause of honeycombing in concrete structures?
A) Excessive water in the concrete mix B) Proper compaction of concrete C) Inadequate vibration during placement D) Using concrete with a high slump
16. According to the Dubai Building Code, what is the maximum allowable height for a building with a G+10 floor limit?
A) 60 m B) 66 m C) 72 m D) 78 m
17. According to the Dubai Building Code, which of the following building parts may exceed the maximum allowable height?
A) Chimneys and smokestacks B) Water reservoirs C) Elevator shafts and stairways D) All of the above
18. What is the minimum width required for an emergency exit door in a public building as per the Dubai Building Code?
A) 750 mm B) 800 mm C) 850 mm D) 900 mm
19. What is the minimum width required for a staircase in a high-rise residential building?
A) 1000 mm B) 1200 mm C) 1400 mm D) 1600 mm
20. What is the minimum thickness of a reinforced concrete slab in a residential building according to the Dubai Building Code?
A) 100 mm B) 125 mm C) 150 mm D) 175 mm
21. A column with a cross-sectional area of 600 cm2 is subjected to an axial load of 3000 kN. What is the axial stress in the column?
a) 5 MPa b) 50 MPa c) 500 MPa d) 0.5 MPa
22. A steel beam has a span of 6 m and carries a uniformly distributed load of 20 kN/m. What is the maximum bending moment in the beam?
a) 60 kNm b) 90 kNm c) 120 kNm d) 180 kNm
Answers
1. Answer A) Only ACI 318-19
"Precast concrete elements, including those that are normally reinforced and/or prestressed, shall be designed and specified under this subsection, supplemented by the requirements given in ACI 318-19
2. Answer: C) 200 mm
Explanation: The minimum recommended slab thickness for post-tensioned systems is 200 mm, with localized thickness reduction allowed if the PT system can be accommodated.
3. Answer: C) 0.9 N/mm2
Explanation: For two-way slabs with varying cross-sections along the slab span, the tendons must provide an effective pre-compression of 0.9 N/mm2.
4. Answer: C. d/2
Explanation: ACI 318-19 specifies that the maximum spacing allowed for shear reinforcement in a beam is d/2, where "d" is the effective depth of the beam. This spacing helps ensure adequate shear strength and control of cracking.
5. Answer: (A) 7 days
Explanation: Concrete typically reaches about 70% of its compressive strength within 7 days of curing. This early strength gain is crucial for the formwork removal and early loading of structures.
6. Answer: C) 1:12
Explanation: The Dubai Building Code specifies that the maximum allowable slope for ramps in parking areas is 1:12. This ratio ensures that vehicles can navigate ramps safely, while also allowing for accessibility for people with disabilities.
7. Answer: B) 3 meters
Explanation: The required fire separation distance between two adjacent buildings is 3 meters. This separation is necessary to prevent the spread of fire from one building to another and to provide space for fire-fighting operations.
8. Answer: b) wL2/12
Explanation: For a fixed-end beam with a uniformly distributed load, the fixed end moment at each support is given by the formula wL2/12. This is a fundamental result in structural analysis and is crucial for analyzing frames and continuous beams.
9. Answer: B) 30 mm Explanation: The Dubai Building Code specifies a minimum clear concrete cover of 30 mm for reinforcement in superstructures.
10. Answer: C) 75 mm Explanation: For substructures where concrete is cast directly against soil, the minimum recommended clear concrete cover for reinforcement is 75 mm.
11. Answer: B) 50 mm Explanation: The minimum recommended clear concrete cover for reinforcement in substructures when concrete is cast against blinding is 50 mm, as per the Dubai Building Code.
12. Answer: B) fcu = 35 N/mm2, f’c = 28 N/mm2
Explanation: The concrete for structural elements should have a cube strength (fcu) of 35 N/mm2 and a cylinder strength (f’c) of 28 N/mm2, as specified by the requirements.
13. Answer: D) 35 N/mm2
Explanation: Structural concrete elements must have a minimum compressive strength of 35 N/mm2 as per the Dubai Building Code
14. Answer is A) 1:2:4
Explanation: The ratio 1:2:4 is a typical mix proportion used in standard concrete mix design. This ratio refers to the parts of cement, sand, and coarse aggregate, respectively. Specifically, this mix consists of:
This proportion is commonly used for general-purpose concrete work such as building foundations, pavements, and slabs where high strength is not the primary concern. Other mix ratios, like 1:1.5:3, are used for higher strength requirements.
15. Answer: C) Inadequate vibration during placement
Explanation: Honeycombing occurs when there are voids or gaps in the concrete, typically caused by inadequate vibration during placement. Proper vibration ensures that the concrete fills all voids and spaces, preventing the formation of honeycombs. Excessive water or high slump can lead to segregation, but they are not the direct cause of honeycombing. Proper compaction (which includes proper vibration) is crucial for preventing this defect.
16. Answer: B) 66 m
Explanation: For a building with G+10 floors, the maximum allowable height is calculated as 11 (total floors including ground floor) × 6 m = 66 m.
17. Answer: D) All of the above
Explanation: Parts of buildings and installations such as chimneys, smokestacks, water reservoirs, elevator shafts, and stairways may exceed the maximum allowable height, provided they do not conflict with DCAA or DCR requirements.
18. Answer: D) 900 mm
Explanation: The minimum width required for an emergency exit door in a public building according to the Dubai Building Code is 900 mm. This ensures that the exit can accommodate the quick and safe evacuation of people during emergencies.
19. Answer: B) 1200 mm
Explanation: The Dubai Building Code requires that staircases in high-rise residential buildings have a minimum width of 1200 mm. This width allows for the safe and efficient movement of people, particularly during emergencies.
20. Answer: C) 150 mm
Explanation: The minimum thickness for a reinforced concrete slab in a residential building, as per the Dubai Building Code, is 150 mm. This thickness provides sufficient structural strength and durability for residential construction.
21. Answer: b) 50 MPa
Explanation: Stress = Force / Area Stress = 3000 kN / 600 cm2 = 3000000 N / 60000 mm2 = 50 N/mm2 = 50 MPa Understanding stress calculations is essential for structural design in high-rise buildings common in Dubai.
22. Answer: b) 90 kNm
Explanation: For a simply supported beam with UDL: Maximum Bending Moment = wL2/8 = (20 kN/m * (6 m)2) / 8 = 90 kNm This calculation is fundamental for beam design in building structures.