Douglas OHI LLC Interview Questions and Answers

Star delta starter is a type of reduced voltage starter used for starting high power motors.

• Consists of two contactors - one for star connection and one for delta connection

• Reduces starting current and torque to prevent damage to motor windings

• Commonly used for motors with high starting current requirements, such as induction motors

Hysteresis loss can be calculated using the area enclosed by the hysteresis loop on a B-H curve.

• Calculate the area enclosed by the hysteresis loop on a B-H curve

• Use the formula: Hysteresis Loss = ∮B.dH

• Consider the material's properties and operating conditions for accurate calculation

Skin effect is the tendency of alternating current to flow near the surface of a conductor, due to self-inductance.

• Skin effect is more prominent at higher frequencies.

• It causes the effective resistance of the conductor to increase.

• Skin effect can be reduced by using hollow conductors or by using stranded conductors.

• Example: Skin effect is a common phenomenon in high-frequency transmission lines.

Fluorescent effect is the emission of light by a substance that has absorbed light or other electromagnetic radiation.

• Fluorescent effect occurs when a substance absorbs light at a specific wavelength and then re-emits light at a longer wavelength.

• Common examples include fluorescent light bulbs, glow-in-the-dark materials, and certain minerals that glow under UV light.

• Fluorescent materials can be used in various applica...read more

In a parallel circuit, components are connected in separate branches, allowing current to flow through multiple paths. In a series circuit, components are connected in a single path, where current flows through each component in sequence.

• Parallel circuit allows current to flow through multiple paths, while series circuit has only one path for current.

• In a parallel circuit, voltage across each component is the same, whi...read more

I chose this company because of its reputation for excellent customer service and opportunities for growth in the tech industry.

• I am passionate about technology and enjoy working with customers to solve their issues.

• I have researched the company and believe in its values and commitment to employee development.

• I see this role as a great opportunity to apply my technical skills in a customer-focused environment.

• I am exci...read more

I am fluent in three languages: English, Spanish, and French.

• Fluent in English, Spanish, and French

• Able to communicate effectively in all three languages

• Experience in multilingual customer service roles

I am applying for this job because of my passion for managing civil projects and my proven track record of successful project completions.

• Passion for managing civil projects

• Proven track record of successful project completions

• Excited about the opportunity to contribute to impactful infrastructure projects

I requested a salary hike due to increased responsibilities, achievements, and market value.

• Increased responsibilities in current role

• Achievements such as successful completion of projects or exceeding targets

• Market value based on industry standards and experience

• Cost of living increase or inflation affecting expenses

The various stages of construction of the foundation of a building include site preparation, excavation, foundation design, footing construction, and foundation pouring.

• Site preparation involves clearing the area and leveling the ground for construction.

• Excavation is the process of digging a hole in the ground to create space for the foundation.

• Foundation design is crucial to ensure the building's stability and load-be...read more

The design mix for concrete is the proportion of various ingredients like cement, sand, aggregates, and water to achieve the desired strength and durability.

• Design mix is determined based on the required strength and durability of the concrete

• It involves selecting the right proportions of cement, sand, aggregates, and water

• Various factors like type of construction, exposure conditions, and desired workability influence...read more

Agile methodologies in B2B projects involve frequent communication, adaptability, and collaboration with stakeholders.

• Agile methodologies in B2B projects prioritize customer collaboration and responding to change over following a strict plan.

• Regular feedback from stakeholders helps in adjusting project scope and priorities in real-time.

• Cross-functional teams work together closely to deliver incremental value to the B2B...read more

I have extensive experience working with barcode scanners in various automation projects.

• Implemented barcode scanning functionality in warehouse management system to track inventory

• Integrated barcode scanners with automated testing tools for regression testing

• Utilized barcode scanners in manufacturing processes to improve efficiency and accuracy

I have experience parallelizing transformers by splitting them across multiple devices to minimize latency.

• I have utilized frameworks like TensorFlow and PyTorch to parallelize transformers.

• I approach splitting transformers by dividing the input data into chunks and distributing them across devices.

• I optimize communication overhead by minimizing data transfer between devices.

• I leverage techniques like data parallelism ...read more

Coalesce is a function used to return the first non-null value in a list of expressions.

• Coalesce function is commonly used in SQL to handle null values.

• It takes multiple arguments and returns the first non-null value.

• Example: COALESCE(column1, column2, 'default') will return the value of column1 if not null, else column2, and if both are null, it will return 'default'.

Repartition is the process of redistributing data across partitions in a distributed system.

• Repartitioning helps in balancing the workload and improving performance in distributed computing environments.

• It involves moving data between partitions based on certain criteria such as key values or hash functions.

• Repartitioning can be done in Spark using operations like repartition() or coalesce().

A non repeatable character is a character that appears only once in a given string.

• Iterate through the string and count the frequency of each character

• Identify the characters that have a frequency of 1

• Return the first non repeatable character found

Sort list without using sort method

• Create a custom sorting function using loops

• Compare each element with every other element to determine the correct order

• Swap elements based on the comparison results