Recpdcl.ltd Interview Questions and Answers

A transformer is an electrical device that transfers electrical energy from one circuit to another through electromagnetic induction.

• Transformers work on the principle of electromagnetic induction

• They are used to increase or decrease the voltage of an alternating current (AC) power supply

• Consists of two coils of wire, primary and secondary, wrapped around a magnetic core

• When AC current flows through the primary coil, it creates a magnetic field that induces a voltage in the s...read more

A transmission line is a specialized cable designed to carry high-frequency electrical signals with minimal loss of energy.

• Transmission lines are used to transmit electrical energy from one point to another.

• They are commonly used in power grids to transport electricity over long distances.

• Transmission lines can be made of various materials such as copper, aluminum, or fiber optic cables.

• The performance of a transmission line is affected by factors such as the length of the li...read more

There are various types of motors such as AC, DC, stepper, servo, and linear motors.

• AC motors are commonly used in household appliances and industrial machinery.

• DC motors are used in electric vehicles, robotics, and small household appliances.

• Stepper motors are used in printers, scanners, and CNC machines.

• Servo motors are used in robotics, automation, and aerospace industry.

• Linear motors are used in high-speed trains, elevators, and robotics.

Substructure refers to the part of a building or structure that is below ground level, while superstructure refers to the part above ground level.

• Substructure includes foundation, basement, and retaining walls

• Superstructure includes columns, beams, walls, and roof

• Substructure is responsible for transferring loads to the ground, while superstructure provides support for the building or structure

• Examples of substructure materials include concrete, steel, and masonry

• Examples of ...read more

Various tests can be done at site to ensure concrete quality.

• Slump test to measure consistency

• Compression test to measure strength

• Air content test to measure air voids

• Temperature test to ensure proper curing

• Rebound hammer test to measure surface hardness

• Ultrasonic test to detect internal defects

• Chloride ion penetration test to measure durability

• Water permeability test to measure resistance to water penetration

Switchgear protection is a system designed to protect electrical equipment from faults and abnormal conditions.

• Switchgear protection involves detecting faults and abnormal conditions in electrical equipment.

• It includes devices such as relays, circuit breakers, and fuses to isolate faulty equipment.

• The protection system ensures the safety of the electrical network and prevents damage to equipment.

• Examples of switchgear protection include overcurrent protection, earth fault pro...read more

Method of estimation refers to the process of calculating the approximate cost of a project or task.

• Estimation can be done using various methods such as approximate quantities method, detailed estimate method, and unit rate method.

• Factors such as labor cost, material cost, equipment cost, and overheads are taken into consideration while estimating.

• Estimation can be done manually or using software such as AutoCAD, Excel, and Primavera.

• Estimation is an important aspect of proje...read more