Interview Q&A Archives - Page 2 of 3 - ENGINEERING BIX

Civil Engineering Interview Questions Part – 19

Question No. 01 What is the biggest dam in America? Answer: The Grand Coulee Dam Grand -Coulee, Washington a) Length 5,223 ft b) Height 550 ft Question No. 02 In the design of elastomeric bearings, why are steel plates inserted inside the bearings? Answer: For elastomeric bearing to function as a soft spring, the bearing should be allowed for bulging laterally and the compression stiffness can be increased by limiting the amount of lateral bulging. To increase the compression stiffness

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Civil Engineering Interview Questions Part – 18

Question No. 01 General Specification for Civil Engineering Works (1992 Edition) Clause 15.09 specifies that tying wires for reinforcement adjacent to and above Class F4 and F5 finishes should be stainless steel wires. Why? Answer: If plain steel tying wires are used for reinforcement adjacent to Class F4 and F5 finishes, it poses the problem of rust staining which may impair the appearance of exposed concrete surfaces. The rate of corrosion of plain steel tying wires is similar to normal

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Civil Engineering Interview Questions Part – 17

Question. No.01 What are the strongest shapes in building? Answer: The pillars Question No. 02 In a curved pre-stressed bridge, how should the guided bearings in piers of the curved region be oriented with respect to the fixed bearing in abutment? Answer: To determine the orientation of guided bearings, one should understand the movement of curved region of a pre-stressed bridge. Movement of pre-stress and creep are tangential to the curvature of the bridge (or along longitudinal axis) while the

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Civil Engineering Interview Questions Part – 16

Question No. 01 In dredged reclamation, what are the considerations in selecting between trailer suction hopper dredgers and grab dredgers? Answer: Trailer suction hopper dredgers are vessels which remove material off the seabed through hydraulic suction by using pumps. During the dredging operation, a mixture of soil and water is transported through suction pipe to storage hoppers. Significant turbulence inside the hoppers keeps the dredged mixture in suspension and this should be minimized to enhance the material to settle swiftly

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Civil Engineering Interview Questions Part – 15

  Question No. 01 In terms of pumping performance, how should engineers determine the use of radial flow pumps and axial flow pumps? Answer: Specific speed is usually defined for a pump operating at its maximum efficiency. In order to minimize the cost of future operation, it is desirable to operate the pumps as close to the maximum efficiency point as possible. The specific speed for radial flow pumps is relatively small when compared with that of axial flow pumps.

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Civil Engineering Interview Questions Part – 14

Question No. 01 Can all utility detectors detect the depth of utilities? Answer: In Hong Kong, underground utility detectors are normally divided into two types: electromagnetic detector and ground penetrating radar (GPR). For electromagnetic detector, it can detect the signals emitted by metallic utilities themselves by passive mode. While in active mode, the detector has to pick up the signals through a transmitter and sonda connected directly to the non-metallic utility. Both the alignment and depth can be found in

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Civil Engineering Interview Questions Part – 13

Question.No.01 Shall reversible moisture movement be taken into account in estimating movement for movement joints? Answer: The size of concrete is affected by changes in atmospheric humidity: moisture causes expansion while drying causes shrinkage. Such moisture movement is reversible. This is totally different from drying shrinkage in which concrete slowly loses moisture during hardening, thus causing irreversible shrinkage. In fact, the variation of humidity and the estimated reversible moisture movement is not significant (about 30%) and therefore, its contribution to

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Civil Engineering Interview Questions Part – 12

Question No. 01 How many Pyramid in Egypt? Answer: About 80 Question No. 02 What is the crack pattern induced by hydration due to internal restraint? Answer: Let’s take a circular column as an example to illustrate this. temperature and the inner concrete is expanding. This induces pressure to the outside and the induced compressive stress will result in formation of radial cracks near the surface of concrete. When the temperature drops, the concrete at the outside drops to surrounding

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Civil Engineering Interview Questions Part – 11

Question No. 01 In the design of service reservoirs, horizontal reinforcement in walls of reservoirs is placed at the outer layer. Why? Answer: Since service reservoirs are designed as water-retaining structures with stringent requirement of crack width control, the design of reinforcement of service reservoirs is under the control of serviceability limit state. For the walls of service reservoirs, contraction and expansion of concrete are more significant in the horizontal direction of walls because of their relatively long lengths when

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Civil Engineering Interview Questions Part – 10

Question No. 01 In the design of pipe jacking, what particular areas on pipe joints should engineers take care of? Answer: Since in pipe jacking, the jacked pipes could hardly be jacked in the designed level and alignment and some deviation from the original one is commonly acceptable provided that the deviation are within the tolerance of the Contract. However, in order to avoid damage made to the pipe joints due to overstressing, it is necessary to estimate the stress

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