Duncan & Ross Interview Questions and Answers

Starters are devices used to start and control the speed of induction motors.

• Direct On-Line (DOL) starter: provides full voltage to the motor at start

• Star-Delta starter: reduces the starting current by initially connecting the motor in star configuration

• Auto-transformer starter: uses an auto-transformer to reduce the voltage during starting

• Soft starter: gradually increases the voltage to the motor to reduce starting cu...read more

Earthing is the process of connecting electrical systems to the ground to prevent electric shock and protect equipment.

• Types of earthing include plate earthing, pipe earthing, rod earthing, and strip earthing.

• Methods of earthing include neutral earthing, equipment earthing, and system earthing.

• Earthing is essential for safety in electrical systems to prevent electric shock and damage to equipment.

• Proper earthing ensure...read more

TF stands for Transformer. It is a static device used to transfer electrical energy between two or more circuits through electromagnetic induction.

• Principle of TF involves Faraday's law of electromagnetic induction.

• Types of TF include step-up, step-down, isolation, auto-transformer, etc.

• TFs are used in power distribution, voltage regulation, impedance matching, etc.

The starting current of a DOL starter is typically 6-8 times the rated current of the motor.

• The Direct-On-Line (DOL) starter is used to start induction motors.

• The starting current of a DOL starter is usually 6-8 times the rated current of the motor.

• This high starting current can cause voltage drops and stress on the electrical system.

Choose AC cables based on current rating, insulation material, and environmental conditions.

• Consider the current rating of the cable to ensure it can handle the load

• Choose the appropriate insulation material based on the application and environment

• Take into account environmental conditions such as temperature, moisture, and exposure to chemicals

• Select the right cable size to minimize voltage drop and power loss

• Ensure c...read more

The output voltage of an AAAC Rabbit conductor is typically around 600 volts.

• The output voltage of an AAAC Rabbit conductor is usually around 600 volts.

• The exact output voltage may vary depending on the specific application and conditions.

• It is important to consult the manufacturer's specifications for accurate information.

My execution work plan involves setting clear goals, creating a timeline, assigning tasks, monitoring progress, and adjusting as needed.

• Set clear goals and objectives for the project

• Create a detailed timeline with milestones and deadlines

• Assign tasks to team members based on their strengths and expertise

• Regularly monitor progress and make adjustments as needed

• Communicate effectively with team members and stakeholders

• Ut...read more

Bar bending schedule is a document that provides details of reinforcement steel bars used in construction projects.

• It includes details such as bar mark, bar size, quantity, shape, and bending dimensions.

• Helps in estimating the quantity of steel required for construction.

• Ensures proper placement and bending of reinforcement bars as per design specifications.

• Used by contractors, engineers, and construction workers for re...read more

28 days concrete strength is the standard measure of concrete's compressive strength after 28 days of curing.

• 28 days concrete strength is the standard measure of concrete's compressive strength after 28 days of curing

• It is important for assessing the quality of concrete and its ability to support structural loads

• The strength of concrete typically continues to increase beyond 28 days, but 28 days is the standard testing

Mivan is a modern construction technique using aluminum formwork, while conventional construction involves traditional methods like brick and mortar.

• Mivan is faster and more efficient than conventional construction methods.

• Mivan requires skilled labor for installation of aluminum formwork.

• Conventional construction is more labor-intensive and time-consuming.

• Mivan provides better quality finishes compared to conventional...read more

Self leveling concrete is a type of concrete that has a high flow consistency and is used to create smooth and level surfaces.

• Self leveling concrete is designed to flow easily and settle into place without the need for troweling or leveling.

• It is commonly used to level uneven floors before installing flooring materials such as tile or carpet.

• Self leveling concrete can be applied in thicknesses ranging from a featheredg...read more

The 1st Aluform mockup concreting typically takes 1-2 days to complete.

• 1-2 days is the usual timeframe for 1st Aluform mockup concreting

• Factors such as weather conditions, size of the mockup, and availability of resources can affect the duration

• Proper planning and coordination can help expedite the process

There are mainly four grades of bitumen commonly used in construction: VG-10, VG-20, VG-30, and VG-40.

• VG-10: Suitable for low-traffic roads

• VG-20: Suitable for medium-traffic roads

• VG-30: Suitable for high-traffic roads

• VG-40: Suitable for heavy-duty traffic areas like airports and container terminals

The compressive strength of cement mortar cube at 3 days is typically around 20-25 MPa.

• Compressive strength of cement mortar cube is an important parameter to assess its quality and durability

• The strength of cement mortar increases with age, so 3 days is an early testing point

• Typical compressive strength values for cement mortar cubes at 3 days range from 20-25 MPa

Earthwork refers to the process of moving, excavating, and compacting soil and rock to prepare the ground for construction.

• Earthwork involves activities such as excavation, grading, compaction, and backfilling.

• It is essential for creating a stable foundation for roads, buildings, and other structures.

• Earthwork also includes the removal of unwanted materials and the addition of necessary materials to achieve the desired...read more

GSB stands for Granular Sub Base and WMM stands for Wet Mix Macadam. GSB WMM is a type of road construction method using layers of granular materials.

• GSB is the layer of granular material placed on the subgrade of a road to provide a stable foundation.

• WMM is a mixture of aggregates, filler, and water laid on the GSB layer to form a strong base for the road.

• GSB WMM construction involves compacting each layer properly to...read more