i
CDM Smith
Filter interviews by
I applied via Referral and was interviewed in Apr 2024. There was 1 interview round.
I applied via Naukri.com and was interviewed before May 2023. There were 3 interview rounds.
SOM stands for Skidmore, Owings & Merrill, a renowned architectural and engineering firm.
SOM is a global architectural, urban planning, and engineering firm known for iconic buildings and structures.
They have designed famous buildings such as the Burj Khalifa in Dubai and the One World Trade Center in New York City.
SOM is known for their innovative and sustainable design solutions.
The firm was founded in 1936 and has o
CDM Smith interview questions for popular designations
I applied via Naukri.com and was interviewed before Aug 2023. There was 1 interview round.
I applied via campus placement at National Institute of Technology (NIT), Tiruchirappalli and was interviewed before Aug 2022. There were 2 interview rounds.
Main unit processes in water treatment include coagulation, flocculation, sedimentation, filtration, and disinfection.
Coagulation: Chemicals are added to water to destabilize particles and allow them to clump together.
Flocculation: Gentle mixing to encourage the particles to form larger flocs.
Sedimentation: Flocs settle to the bottom of a tank due to gravity.
Filtration: Water passes through filters to remove remaining ...
Some advanced water treatment processes include reverse osmosis, UV disinfection, and advanced oxidation.
Reverse osmosis: uses a semi-permeable membrane to remove ions, molecules, and larger particles from water.
UV disinfection: uses ultraviolet light to kill bacteria, viruses, and other microorganisms in water.
Advanced oxidation: uses powerful oxidants like ozone or hydrogen peroxide to break down organic and inorgani
I applied via Approached by Company and was interviewed before Aug 2021. There was 1 interview round.
I applied via Referral and was interviewed before May 2021. There were 2 interview rounds.
I applied via Approached by Company and was interviewed before Oct 2017. There was 1 interview round.
Top trending discussions
posted on 17 Mar 2021
I applied via Naukri.com and was interviewed in Feb 2021. There was 1 interview round.
The input required for a single line diagram includes information about the electrical system components and their connections.
Information about the electrical system components such as generators, transformers, switchgear, and loads
The connections between these components including the type of connection and the ratings of the equipment
The voltage level of the system and the type of system grounding
The protective devi...
Motor feeder and power feeder requirements are essential for electrical design engineers to ensure proper functioning of electrical systems.
Motor feeder requirements include selecting the appropriate motor size, voltage, and current rating.
Power feeder requirements involve determining the load requirements and selecting the appropriate cable size and voltage drop.
Proper coordination and protection devices such as circu...
Hazardous area classification involves categorizing areas based on the presence of flammable gases, vapors, or dusts.
Hazardous areas are classified based on the likelihood of the presence of flammable substances.
Temperature Class refers to the maximum surface temperature of equipment that can be used in a hazardous area.
Hazardous areas are categorized into zones based on the frequency and duration of the presence of fl...
1.25 FLA is taken for circuit breaker and 1.5 times for contactor to ensure protection against overloading and short circuits.
1.25 FLA is the maximum current that a circuit breaker can handle without tripping.
1.5 times FLA is taken for contactor to ensure that it can handle the inrush current during motor starting.
This also provides protection against short circuits and overloading.
For example, if the full load current...
Percentage Impedance is a measure of the voltage drop in a transformer during a short circuit. It determines the ability of the transformer to withstand short circuit currents.
Percentage Impedance is the ratio of the rated voltage of a transformer to the short circuit current at its terminals, expressed as a percentage.
It represents the internal impedance of the transformer and is usually provided by the manufacturer.
A...
Protection schemes for transformers and generators.
Overcurrent protection
Differential protection
Distance protection
Restricted earth fault protection
Backup protection
Buchholz relay protection
Thermal overload protection
Under/over voltage protection
Neutral grounding protection
Cable sizing is calculated using the formula for voltage drop, which takes into account resistive and inductive drop. Voltage drop is limited to 5% to ensure efficient power transmission.
Cable sizing is determined by calculating the voltage drop using the formula: VD = (I * L * R * 2) / 1000
Resistive drop is calculated using Ohm's Law: Vr = I * R
Inductive drop is calculated using the formula: Vi = I * X
Voltage drop is ...
Earthing calculation standards and resistances for substation and lightning protection.
Earthing calculation involves determining the resistance of the earth electrode system.
The standard used for earthing calculation is IEEE 80.
The resistance in substation should be less than 1 ohm.
The resistance for lightning protection should be less than 10 ohms.
Factors affecting earthing calculation include soil resistivity, electr...
The motor contribution to the short circuit current is significant and needs to be considered in electrical design.
The motor's impedance affects the short circuit current level.
The motor's starting current can cause a significant increase in short circuit current.
The motor's location in the electrical system can affect its contribution to the short circuit current.
The motor's size and type can also impact its contribut...
Types of contactors include AC, DC, reversing, and definite purpose. Maximum efficiency of transformer depends on load and design.
AC contactors are used for alternating current circuits
DC contactors are used for direct current circuits
Reversing contactors are used to reverse the direction of current flow
Definite purpose contactors are designed for specific applications
Maximum efficiency of transformer is achieved at fu...
Non-linear loads are electrical devices that do not have a linear relationship between the voltage and current.
Non-linear loads draw non-sinusoidal current waveforms.
They can cause harmonic distortion in the electrical system.
Examples of non-linear loads include computers, televisions, and variable speed drives.
Linear loads have a linear relationship between voltage and current, such as incandescent light bulbs.
Linear
Explanation of lighting calculation, light loss factor, utilisation factor, and minimum lux required in substation.
Lighting calculation involves determining the amount of light required in a space.
Light loss factor is the reduction in light output due to factors such as dirt, dust, and aging of lamps.
Utilisation factor is the ratio of light received by a surface to the total light output of the lamps.
Formula for lighti...
APFC stands for Automatic Power Factor Correction. Series reactor is a device used to limit current flow.
APFC is a system that automatically corrects the power factor of an electrical network.
It uses capacitors to improve the power factor and reduce energy consumption.
Series reactor is a device that is used to limit the flow of current in a circuit.
It is used to protect equipment from overvoltage and to reduce harmonic...
based on 8 interviews
Interview experience
based on 156 reviews
Rating in categories
Project Control Specialist
27
salaries
| ₹6 L/yr - ₹17.5 L/yr |
BIM Modeller
23
salaries
| ₹6 L/yr - ₹12 L/yr |
GIS Specialist
18
salaries
| ₹3.4 L/yr - ₹11 L/yr |
Structural Engineer
11
salaries
| ₹6 L/yr - ₹10.5 L/yr |
Service Desk Specialist
11
salaries
| ₹3.6 L/yr - ₹6 L/yr |
AECOM
Jacobs Engineering Group
Black & Veatch
TCE