MapmyIndia Interview Questions and Answers

Electroplating is a process of depositing a metal coating onto a conductive surface using an electric current.

• The object to be plated is made the cathode in an electrolytic cell

• The anode is made of the plating metal

• The electrolyte solution contains ions of the plating metal

• When a current is passed through the cell, metal ions are reduced and deposited onto the cathode

• Common applications include coating of jewelry, automotive parts, and electronic components

A transformer is an electrical device that transfers electrical energy from one circuit to another through electromagnetic induction. Testing procedure involves various tests to ensure proper functioning.

• Transformers are used to step up or step down voltage levels in electrical circuits.

• Testing procedures include insulation resistance test, winding resistance test, turns ratio test, and oil testing.

• Insulation resistance test checks the insulation resistance of the transformer...read more

Over current is when the current flowing through a circuit exceeds its rated capacity. Earth fault is when current flows to earth due to insulation failure.

• Over current can cause damage to equipment and can be a fire hazard.

• Earth fault can cause electric shock and damage to equipment.

• Both can be prevented by proper installation and maintenance of electrical systems.

• Examples of protective devices include fuses, circuit breakers, and residual current devices (RCDs).

Electrical protection refers to measures taken to prevent electrical hazards and damage to equipment.

• Electrical protection includes the use of circuit breakers, fuses, and surge protectors.

• Grounding and bonding are also important aspects of electrical protection.

• Electrical protection is necessary to prevent electrical shock, fires, and damage to electrical equipment.

• Examples of electrical protection measures include GFCI outlets, arc fault circuit interrupters, and lightning ...read more

Equipment in classified areas must be designed to prevent the ignition of flammable gases, vapors, or dust.

• Equipment must be properly rated for the specific hazardous area classification (e.g. Class I, Division 1)

• Equipment must be installed and maintained according to the requirements of the National Electrical Code (NEC) or other relevant standards

• Common examples of equipment in classified areas include explosion-proof enclosures, intrinsically safe devices, and purged panel...read more

Substation design involves planning and layout of electrical equipment to efficiently distribute power.

• Substation design includes determining the location, size, and configuration of transformers, circuit breakers, and other equipment.

• Considerations for substation design include safety, reliability, efficiency, and future expansion.

• Proper grounding and lightning protection are essential components of substation design.

• Examples of substation design elements are busbars, switch...read more