Pipeline DesignConstruction Interview Questions and Answers in 2025 (100+ Q&A)

Pipeline DesignConstruction Site/ Field Engineer - Instrumentation/ Electronics

Ques:- How far is the ocean horizon line from the shore eye view?

Right Answer:
The ocean horizon line is approximately 3.1 miles (5 kilometers) away from the shore for an observer standing at eye level of about 5.5 feet (1.7 meters).

Pipeline DesignConstruction Site/ Field Engineer - Instrumentation/ Electronics

Ques:- Is there more land mass above or below the equator?

Asked In :- Intuitive (Intuitive Surgical), cng engineering,

Right Answer:
There is more land mass above the equator.

Design Engineer - Pipeline Design Pipeline DesignConstruction

Ques:- What is the difference between NP2 Class and NP3 Class RCC Hume pipes

Asked In :-

Right Answer:
NP2 Class RCC Hume pipes have a minimum crushing strength of 2.5 MPa, while NP3 Class RCC Hume pipes have a minimum crushing strength of 4.0 MPa. This means NP3 pipes are stronger and can handle higher loads compared to NP2 pipes.

Pipeline DesignConstruction Quality Engineer - Civil/ Structural

Ques:- How many days we should curing for plastering,brickwork,concrete?

Asked In :- weir minerals,

Right Answer:
Curing for plastering should be done for at least 7 days, for brickwork at least 7 days, and for concrete at least 7 days, but ideally 28 days for optimal strength.

Design Engineer - Pipeline Design Pipeline DesignConstruction

Ques:- What is the difference between arch dam and gravity dam.Name a gravity dam in India

Asked In :-

Right Answer:
An arch dam is a curved structure that transfers the water pressure to the canyon walls, while a gravity dam is a straight structure that relies on its weight to resist the water pressure. A notable gravity dam in India is the Bhakra Dam.

Pipeline DesignConstruction Project Manager/ Chief Engineer - Construction/ Civil

Ques:- Give the full form for upvc pipe & cpvc pipe

Asked In :-

Right Answer:
UPVC: Unplasticized Polyvinyl Chloride
CPVC: Chlorinated Polyvinyl Chloride

Design Engineer - Pipeline Design Pipeline DesignConstruction

Ques:- How much nails used in 1 sq m shuttering

Asked In :-

Right Answer:
Approximately 8 to 10 kg of nails are used in 1 square meter of shuttering.

Pipeline DesignConstruction Project Manager/ Chief Engineer - Construction/ Civil

Ques:- What are the advantages and disadvantages of using bentonite slurry in bored cast in situ piles, both in terms of design and execution point of view.

Asked In :-

Right Answer:
**Advantages of using bentonite slurry in bored cast in situ piles:**

1. **Stability:** It helps stabilize the borehole walls, preventing collapse during excavation.
2. **Reduced Water Infiltration:** Minimizes water ingress, which can affect the concrete quality.
3. **Soil Removal:** Facilitates the removal of cuttings from the borehole.
4. **Improved Concrete Quality:** Reduces the risk of contamination and enhances the bond between the concrete and soil.
5. **Control of Groundwater:** Helps manage groundwater levels during construction.

**Disadvantages of using bentonite slurry:**

1. **Cost:** Increased material and handling costs compared to other methods.
2. **Environmental Concerns:** Potential for environmental contamination if not managed properly.
3. **Slurry Management:** Requires careful management and disposal of used slurry.
4. **Time-Consuming:** Additional time may be needed for slurry preparation and maintenance.
5. **Potential for Clogging:** Risk of clog

Draftsman/ Draughtsman - Piping Pipeline DesignConstruction

Ques:- What is stub column ?

Asked In :- iowa department of transportation, rsb transmissions (i) ltd, pune, india,

Right Answer:
A stub column is a short vertical section of a pipe that is used to connect or support other piping components, often providing a means for future extensions or modifications in the piping system.

Draftsman/ Draughtsman - Piping Pipeline DesignConstruction

Ques:- Distinguish between Theodolite and dumpy Level?

Asked In :- Mann Hummel, Axiscades Engineering Technologies, scottish water,

Right Answer:
Theodolite is an instrument used for measuring horizontal and vertical angles, while a dumpy level is used primarily for measuring horizontal levels and elevations. Theodolites are more versatile and precise for angle measurements, whereas dumpy levels are simpler and mainly used for leveling tasks.

Pipeline DesignConstruction Project Manager/ Chief Engineer - Construction/ Civil

Ques:- What is the ratio of steel and concrete to use in slabs ,beams, columns ?

Asked In :-

Right Answer:
The typical ratio of steel to concrete in slabs is about 0.5% to 1%, in beams is about 1% to 2%, and in columns is about 1% to 4%, depending on the design requirements and load conditions.

Design Engineer - Pipeline Design Pipeline DesignConstruction

Ques:- WHAR IS DIFFERENCE BETWEEN NOMINAL MIX & DESIGN MIX IN DETAIL

Asked In :- PVC,

Right Answer:
Nominal mix refers to a fixed proportion of materials (cement, sand, aggregate) based on standard ratios, typically used for small-scale projects. Design mix, on the other hand, is a scientifically calculated proportion of materials based on specific project requirements, considering factors like strength, durability, and workability, and is used for larger or more critical structures.

Design Engineer - Pipeline Design Pipeline DesignConstruction

Ques:- How to calculate rate analysis of M25 grade concrete

Asked In :- burn manufacturing usa llc,

Right Answer:
To calculate the rate analysis of M25 grade concrete, follow these steps:

1. **Determine the Mix Ratio**: M25 concrete typically has a mix ratio of 1:1:2 (Cement: Sand: Aggregate).

2. **Calculate Material Quantities**: For 1 cubic meter of M25 concrete:
- Cement = 1 part = 0.4 m³
- Sand = 1 part = 0.4 m³
- Aggregate = 2 parts = 0.8 m³

3. **Convert to Weight**:
- Cement: 0.4 m³ × 1440 kg/m³ = 576 kg
- Sand: 0.4 m³ × 1600 kg/m³ = 640 kg
- Aggregate: 0.8 m³ × 1500 kg/m³ = 1200 kg

4. **Calculate Costs**:
- Cement cost per kg ×

Pipeline DesignConstruction Project Manager/ Chief Engineer - Construction/ Civil

Ques:- How much cft in 1 bag cement.

Asked In :-

Right Answer:
1 bag of cement (typically 50 kg) is approximately 1.25 cubic feet (cft).

Pipeline DesignConstruction Project Manager/ Chief Engineer - Construction/ Civil

Ques:- Write short notes on stress concentration?

Asked In :-

Right Answer:
Stress concentration refers to the occurrence of higher stress levels in a material at specific points, often due to geometric discontinuities such as holes, notches, or abrupt changes in shape. These areas experience stress that is significantly greater than the average stress in the surrounding material, which can lead to failure or fatigue if not properly accounted for in design.

Pipeline DesignConstruction Project Manager/ Chief Engineer - Construction/ Civil

Ques:- What”s the merits and demerits of hollow blocks comapre thanto bricks?

Asked In :-

Right Answer:
**Merits of Hollow Blocks:**
1. Lightweight, reducing transportation and handling costs.
2. Better insulation properties, improving energy efficiency.
3. Faster construction due to larger size and fewer joints.
4. Cost-effective in terms of material and labor.

**Demerits of Hollow Blocks:**
1. Lower compressive strength compared to solid bricks.
2. More susceptible to water absorption, which can affect durability.
3. Requires careful handling to avoid breakage.
4. Limited availability in some regions compared to traditional bricks.

Draftsman/ Draughtsman - Piping Pipeline DesignConstruction

Ques:- How can conclude that whether it is gravity die castingcomponent or pressure die casting or low pressure diecasting and shell moulding?

Asked In :-

Right Answer:
To determine whether a component is made using gravity die casting, pressure die casting, low pressure die casting, or shell moulding, you can look for the following characteristics:

1. **Gravity Die Casting**: Typically has a rough surface finish and thicker walls, as it relies on gravity to fill the mold.

2. **Pressure Die Casting**: Features a smooth surface finish and thinner walls, as molten metal is injected into the mold under high pressure.

3. **Low Pressure Die Casting**: Similar to pressure die casting but uses lower pressure; components may have a smooth finish and are often lighter.

4. **Shell Moulding**: Usually has a very smooth surface and is made from a sand-resin mixture, often resulting in intricate designs and thinner sections.

Identifying these features will help you conclude the casting method used for the component.

Draftsman/ Draughtsman - Piping Pipeline DesignConstruction

Ques:- What is stressing

Asked In :- Wheels India,

Right Answer:
Stressing is the process of applying a predetermined amount of force or load to a pipe or pipeline system to ensure it can withstand operational conditions without failure, often done during the design and installation phases to account for thermal expansion, contraction, and other stresses.

Pipeline DesignConstruction Project Manager/ Chief Engineer - Construction/ Civil

Ques:- Concrete Mix designs for M15,M20,M25,M30 and M35

Asked In :-

Right Answer:
**Concrete Mix Designs:**

- **M15**:
- Cement: 1 part
- Sand: 2 parts
- Aggregate: 4 parts
- Water: 0.5 parts

- **M20**:
- Cement: 1 part
- Sand: 1.5 parts
- Aggregate: 3 parts
- Water: 0.5 parts

- **M25**:
- Cement: 1 part
- Sand: 1 part
- Aggregate: 2 parts
- Water: 0.45 parts

- **M30**:
- Cement: 1 part
- Sand: 0.75 parts
- Aggregate: 1.5 parts
- Water: 0.4 parts

- **M35**:
- Cement: 1 part
- Sand: 0.6 parts

Pipeline DesignConstruction Project Manager/ Chief Engineer - Construction/ Civil

Ques:- What do you understand by Fe250 grade steel?

Asked In :-

Right Answer:
Fe250 grade steel is a type of structural steel that has a minimum yield strength of 250 MPa (megapascals). It is commonly used in construction and engineering applications for its strength and durability.

The Pipeline Design & Construction category on takluu.com is specially curated for professionals and aspirants preparing for roles in the oil and gas, water supply, and infrastructure sectors. Pipelines are critical for safely transporting liquids and gases over long distances, and designing them requires a deep understanding of engineering principles, materials, and safety standards.

This category covers all important aspects including pipeline route selection, material specification, stress analysis, welding techniques, corrosion control, and environmental considerations. You will also explore construction methodologies, testing procedures, and regulatory compliances involved in pipeline projects.

Interview questions in this domain often focus on real-world challenges like managing pipeline integrity, ensuring leak prevention, handling pressure variations, and working with diverse terrain. Having hands-on knowledge about pipeline inspection tools and safety protocols can give you an edge in technical interviews.

At Takluu, we provide clear explanations, practical examples, and commonly asked questions to help you grasp complex pipeline design and construction concepts. Whether you are a fresh graduate or an experienced engineer, this category equips you to confidently demonstrate your expertise and problem-solving abilities.

Understanding pipeline design and construction is crucial for delivering reliable infrastructure solutions that meet industry standards and protect the environment. With the resources here, you’ll be well-prepared to succeed in your career and contribute effectively to critical projects.

Questions in: Pipeline DesignConstruction

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