30+ Diploma Electrical Engineer Interview Questions and Answers for Freshers

Ohm's law states that current is directly proportional to voltage and inversely proportional to resistance at a constant.

• Current increases as voltage increases, and decreases as resistance increases.

• Voltage is measured in volts (V), current in amperes (A), and resistance in ohms (Ω).

• Ohm's law can be expressed as I = V/R, where I is current, V is voltage, and R is resistance.

Yes, there are different types of wires used in transmission.

• The most common types of wires used in transmission are copper, aluminum, and steel-cored aluminum.

• Copper wires are the most efficient and expensive, while aluminum wires are less efficient but more affordable.

• Steel-cored aluminum wires are used for long-distance transmission as they have high tensile strength.

• Other types of wires used in transmission include ACSR (Aluminum Conductor Steel Reinforced) and AAC (All A...read more

Another name for induction motor is asynchronous motor.

• Asynchronous motor is commonly used in industrial applications.

• It operates at a slightly slower speed than the synchronous speed.

• Examples include squirrel cage induction motor and wound rotor induction motor.

The neutral wire carries current back to the source, while the earth wire provides a path for electrical faults to safely discharge.

• Neutral wire carries current back to the source

• Earth wire provides a path for electrical faults to safely discharge

• Neutral wire is typically colored white or gray

• Earth wire is typically colored green or green with yellow stripes

• Neutral wire is connected to the grounding system at the main electrical panel

• Earth wire is connected to the grounding e...read more

A fuse is a one-time use device that melts when overloaded while a breaker can be reset and reused.

• A fuse needs to be replaced after it melts while a breaker can be reset

• A fuse is cheaper than a breaker

• A fuse reacts faster to overloads than a breaker

• A breaker can handle higher current loads than a fuse

• Examples of fuses include glass tube fuses and cartridge fuses while examples of breakers include thermal-magnetic and ground fault circuit interrupters (GFCI)

There are mainly two types of solar panel installation: On-grid and Off-grid.

• On-grid installation is connected to the main power grid and excess energy can be sold back to the utility company.

• Off-grid installation is not connected to the main power grid and requires battery storage to store excess energy.

• Other types include ground-mounted, roof-mounted, and pole-mounted installations.

• Installation methods can also vary depending on the type of roof or ground surface.

Transformers cannot operate on DC supply due to the absence of changing magnetic field required for induction.

• Transformers work on the principle of electromagnetic induction, which requires a changing magnetic field.

• DC supply produces a constant magnetic field, which does not induce a voltage in the secondary coil of the transformer.

• AC supply, on the other hand, produces a changing magnetic field, allowing for induction and voltage transformation.

• Operating a transformer on DC...read more

Motors and generators are electrical machines that convert electrical energy into mechanical energy and vice versa. PCB and soldering are components used in electronic circuits.

• Motors convert electrical energy into mechanical energy to produce motion.

• Generators convert mechanical energy into electrical energy.

• PCB (Printed Circuit Board) is a board made of insulating material with conductive pathways etched onto it to connect electronic components.

• Soldering is the process of j...read more

AC and DC are two types of electrical current. There are two types of transformers - step-up and step-down.

• AC stands for alternating current and DC stands for direct current

• AC changes direction periodically while DC flows in one direction

• Step-up transformers increase voltage while step-down transformers decrease voltage

• Transformers are used to transfer electrical energy from one circuit to another

• Examples of AC devices include household appliances and power grids, while examp...read more

Maintenance equipment for transformers include oil filtration systems, temperature sensors, and insulation testers.

• Oil filtration systems to remove impurities and extend the life of transformer oil

• Temperature sensors to monitor the temperature of the transformer and prevent overheating

• Insulation testers to check the insulation resistance of the transformer

• Dissolved gas analysis equipment to detect any faults in the transformer

• Bushings and tap changers for regular maintenance ...read more

A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.

• Transformers are used to increase or decrease the voltage in an electrical circuit.

• They consist of two or more coils of wire, known as windings, which are wound around a core made of magnetic material.

• The primary winding is connected to the input voltage source, while the secondary winding is connected to the load.

• Step-up transformers increase ...read more

Safety management in technical workshops involves identifying and mitigating potential hazards to ensure a safe working environment.

• Conducting regular safety audits and inspections

• Providing appropriate personal protective equipment (PPE) to workers

• Implementing safety protocols and procedures

• Training workers on safe work practices

• Maintaining equipment and machinery to prevent accidents

• Ensuring proper storage and handling of hazardous materials

• Posting safety signs and warnings ...read more

In an electrical circuit, Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage applied across it and inversely proportional to the resistance of the conductor.

• Ohm's Law states V = I * R, where V is voltage, I is current, and R is resistance.

• If the voltage in a circuit increases, the current will also increase if the resistance remains constant.

• If the resistance in a circuit increases, the current will decrease if the voltage re...read more

Transformer maintenance involves regular inspection, cleaning, and testing to ensure optimal performance and prevent breakdowns.

• Inspect transformer for signs of damage or wear

• Clean transformer components and cooling system

• Test transformer insulation and oil quality

• Replace worn or damaged parts as needed

• Perform regular maintenance according to manufacturer guidelines

• Keep records of maintenance and repairs for future reference

Rectifier converts AC to DC by allowing current to flow in one direction only.

• Rectifier uses diodes to convert AC to DC.

• Diodes allow current to flow in one direction only.

• Half-wave rectifier uses only one diode while full-wave rectifier uses four diodes.

• Bridge rectifier is a type of full-wave rectifier.

• Rectifier is used in power supplies and electronic devices.

• Examples of rectifiers include Selenium rectifier, Silicon rectifier, and Schottky rectifier.

Wiring of house power and lights circuit involves proper planning, installation, and maintenance.

• Plan the circuit layout and choose appropriate wires and cables

• Install circuit breakers, switches, and outlets as per safety standards

• Ensure proper grounding and bonding of electrical system

• Regularly inspect and maintain the wiring system to prevent hazards

• Use proper color coding for wires to avoid confusion

• Separate power and lighting circuits to prevent overload

• Install GFCI outle...read more

Busbars are used to conduct large currents of electricity in a safe and efficient manner.

• Busbars are made of copper or aluminum and are used to distribute power throughout a building or facility.

• They are often used in switchgear and distribution panels to connect circuit breakers and other electrical equipment.

• Busbars can handle high levels of current without overheating or melting, making them a reliable and safe choice for power distribution.

• They are also used in electrical...read more

Mortar is a mixture of cement, sand, and water used to bind bricks or stones together. There are different types of mortar.

• Mortar is used in construction to bind bricks or stones together

• The most common type of mortar is Portland cement mortar

• Other types of mortar include lime mortar, mud mortar, and epoxy mortar

• The type of mortar used depends on the type of construction and the materials being used

Nuts and bolts are hardware fasteners used to join two or more objects together.

• Nuts are internally threaded and are used with bolts to fasten objects together.

• Bolts are externally threaded and have a head at one end and a threaded shank at the other end.

• Nuts and bolts come in various sizes and materials, including steel, brass, and aluminum.

• They are commonly used in construction, automotive, and manufacturing industries.

• Examples of nuts and bolts include hex bolts, carriage ...read more

5S is a workplace organization method that aims to improve efficiency and productivity by maintaining cleanliness and orderliness.

• 5S stands for Sort, Set in Order, Shine, Standardize, and Sustain

• Sort involves removing unnecessary items from the workplace

• Set in Order involves organizing the remaining items in a logical and efficient manner

• Shine involves cleaning and maintaining the workplace

• Standardize involves creating procedures and guidelines for maintaining the workplace

• Su...read more

The Mejar of current refers to the unit of measurement for electric current, which is amperes (A).

• Mejar is a term used to refer to the unit of measurement for electric current.

• The unit of measurement for electric current is amperes (A).

• Mejar is another term for amperes.

• Current is measured in Mejar (A).

Induction motor works on the principle of electromagnetic induction to convert electrical energy into mechanical energy.

• The stator of the motor has a set of windings that are supplied with AC current, creating a rotating magnetic field.

• This rotating magnetic field induces a current in the rotor windings, which in turn creates a magnetic field that interacts with the stator field.

• The interaction between the two fields causes the rotor to rotate, converting electrical energy in...read more

Transformers are electrical devices that transfer electrical energy between two or more circuits through electromagnetic induction.

• Transformers are used to step up or step down voltage levels in electrical power transmission and distribution systems.

• They consist of two or more coils of wire, known as windings, that are wound around a core made of magnetic material.

• The primary winding is connected to the input voltage source, while the secondary winding is connected to the loa...read more

An exciter is a device that supplies the field current to the rotor winding of a synchronous machine.

• Supplies field current to the rotor winding

• Helps in generating the magnetic field in the rotor

• Essential component in synchronous machines

• Can be either brushless or brush type

• Examples include static exciter and rotating exciter

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

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

• They consist of two coils of wire, known as the primary and secondary coils, which are wound around a common magnetic core.

• When an AC voltage is applied to the primary coil, it creates a magnetic field that induces a voltage in the secondary coi...read more

OMS Low refers to the low voltage protection feature in electrical systems to prevent damage to equipment.

• OMS Low is a feature in electrical systems that monitors voltage levels and triggers protection mechanisms when voltage drops below a certain threshold.

• It helps prevent damage to sensitive equipment by cutting off power or activating alarms when voltage is too low.

• OMS Low settings can be adjusted based on the specific requirements of the electrical system and equipment be...read more

Generator AC refers to the alternating current produced by a generator.

• Generator AC is produced by rotating a coil of wire within a magnetic field.

• The AC voltage produced by a generator can be controlled by adjusting the speed of rotation or the strength of the magnetic field.

• Generator AC is commonly used in power generation and distribution systems.

• Examples of generators that produce AC include wind turbines, hydroelectric generators, and gas-powered generators.