Diploma Electrical Engineer
100+ Diploma Electrical Engineer Interview Questions and Answers
Q51. What is RBA? How to use in baring
RBA stands for 'Roller Bearing Assembly'. It is used in rotating machinery to reduce friction and support radial and axial loads.
RBA is a type of bearing that uses cylindrical rollers instead of balls to reduce friction.
It is commonly used in heavy-duty applications such as wind turbines, cranes, and mining equipment.
RBA can support both radial and axial loads, making it ideal for applications where there is both vertical and horizontal movement.
To use RBA in baring, it shoul...read more
Q52. What is silika gel
Silica gel is a desiccant commonly used to absorb moisture and prevent the growth of mold and mildew.
Silica gel is a porous form of silicon dioxide.
It is often found in small packets or sachets.
It is used in various industries such as electronics, pharmaceuticals, and food packaging.
Silica gel can absorb moisture up to 40% of its own weight.
It is non-toxic and chemically inert.
Common uses include preserving the freshness of products, protecting electronic devices from moistur...read more
Q53. Transformers in two windings primary and secondary
Transformers have two windings, primary and secondary, which are used to transfer electrical energy from one circuit to another.
Primary winding receives electrical energy from the source
Secondary winding transfers the electrical energy to the load
The ratio of turns in the primary and secondary windings determines the voltage transformation
Transformers can step up or step down voltage levels
Examples: power transformers, distribution transformers
Q54. How to handle in construction line?
Handling in construction line involves effective planning, communication, problem-solving, and coordination.
Develop a detailed project plan and schedule to ensure smooth execution.
Communicate effectively with team members, contractors, and clients to ensure everyone is on the same page.
Identify and solve problems promptly to avoid delays and cost overruns.
Coordinate with different stakeholders, such as architects, engineers, and suppliers, to ensure timely delivery of materia...read more
Q55. How to maintenance transformer
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
Q56. What are the different types of diodes
Different types of diodes include PN junction diode, Zener diode, Schottky diode, Light Emitting Diode (LED), and Photodiode.
PN junction diode: Basic type of diode used in most electronic circuits.
Zener diode: Used for voltage regulation and protection against overvoltage.
Schottky diode: Faster switching speed and lower forward voltage drop compared to PN junction diode.
Light Emitting Diode (LED): Emits light when current flows through it, used in displays and indicators.
Phot...read more
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Q57. What are the different types of losses
Different types of losses in electrical engineering include copper losses, iron losses, stray losses, and mechanical losses.
Copper losses: Occur in the windings of electrical machines due to resistance in the copper wire.
Iron losses: Also known as core losses, occur in the magnetic core of transformers and machines due to hysteresis and eddy currents.
Stray losses: Occur due to leakage flux and eddy currents in the surrounding structures of electrical machines.
Mechanical losse...read more
Q58. What's is tha 3 phase tranformer
A 3 phase transformer is a type of transformer that is designed to handle three-phase power distribution systems.
Consists of three sets of primary and secondary windings
Used in power distribution systems to step up or step down voltage in three-phase circuits
Commonly used in industrial and commercial applications
Examples include distribution transformers, power transformers, and autotransformers
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Q59. How does the rectifier work?
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.
Q60. How many types of motors are there?
There are several types of motors used in electrical engineering.
AC motors: Induction motors, synchronous motors
DC motors: Brushed DC motors, brushless DC motors
Stepper motors
Servo motors
Linear motors
Special-purpose motors: Universal motors, reluctance motors, etc.
Q61. How many Types of power Plant .?
There are several types of power plants including thermal, hydroelectric, nuclear, solar, wind, and geothermal.
Thermal power plants use fossil fuels like coal, oil, or natural gas to generate electricity.
Hydroelectric power plants harness the energy of flowing water to generate electricity.
Nuclear power plants use nuclear reactions to produce electricity.
Solar power plants convert sunlight into electricity using photovoltaic cells.
Wind power plants use wind turbines to genera...read more
Q62. What is difference contractor or relay
Contractor is a device used to make or break an electrical circuit, while relay is an electromagnetic switch that opens or closes circuits.
Contractor is typically used for high power applications, while relay is used for low power applications.
Contractor is usually larger in size and can handle higher currents, while relay is smaller and handles lower currents.
Contractors are commonly used in industrial settings for controlling motors, while relays are used in control circuit...read more
Q63. What is difference neutral or earthing
Neutral is a current-carrying conductor that completes the circuit, while earthing is a safety measure to prevent electric shock.
Neutral wire carries current back to the source in a circuit
Earthing provides a path for fault currents to flow safely to the ground
Neutral wire is typically connected to the center tap of a transformer
Earthing is done by connecting metal parts of electrical equipment to the earth
Q64. Draw a single line diagram of basic residential house.
A single line diagram of a basic residential house shows the electrical connections and components in a simplified manner.
Main service panel receives power from utility company
Branch circuits for lights, outlets, appliances
Grounding system for safety
Optional components like solar panels or backup generator
Example: Service panel -> Lighting circuit -> Outlet circuit -> Grounding system
Q65. Wiring of house power and lights circuit.
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
Q66. Full form miniature circuit breaker
Miniature Circuit Breaker (MCB) is a device designed to protect electrical circuits from overloads and short circuits.
MCB stands for Miniature Circuit Breaker
It is a type of circuit breaker that automatically switches off electrical circuits during abnormal conditions
MCBs are commonly used in residential, commercial, and industrial applications
They are available in different ratings such as 6A, 10A, 16A, etc.
MCBs are more compact and easier to install compared to traditional ...read more
Q67. Transformar and it's types,and safty of transforma r
Transformers are electrical devices that transfer electrical energy between two or more circuits through electromagnetic induction.
Transformers are used to increase or decrease the voltage levels in electrical systems.
There are two main types of transformers: step-up transformers and step-down transformers.
Step-up transformers increase the voltage level, while step-down transformers decrease the voltage level.
Transformers are essential in power transmission and distribution s...read more
Q68. Star delta stater diagram, transformer safety and predictive,preventive maintenance difference
Star delta starter diagram is used for motor starting, transformer safety involves protection measures, and predictive maintenance is proactive while preventive maintenance is scheduled.
Star delta starter diagram is used for reducing starting current in motors.
Transformer safety involves measures like overcurrent protection, earth fault protection, and temperature monitoring.
Predictive maintenance involves using data and analytics to predict when equipment will fail.
Preventiv...read more
Q69. What is use of busbar
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
Q70. What is motar or types of motar
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
Q71. Explain the solar energy translation and distribution
Solar energy is converted into electricity through photovoltaic cells and then distributed through a grid system.
Solar energy is captured by solar panels, which contain photovoltaic cells that convert sunlight into electricity.
The electricity generated is then fed into an inverter, which converts it from direct current (DC) to alternating current (AC) for use in homes and businesses.
The AC electricity is then distributed through a grid system, which delivers power to various ...read more
Q72. What is ac and dc
AC stands for alternating current, which periodically changes direction. DC stands for direct current, which flows in one direction.
AC is commonly used in household appliances and power distribution systems.
DC is commonly used in batteries and electronic devices.
AC changes direction periodically, while DC flows in one direction continuously.
AC is generated by power stations and transmitted over long distances.
DC is used in applications where a constant voltage is required, su...read more
Q73. What is capacitor
A capacitor is an electronic component that stores and releases electrical energy in a circuit.
Capacitors consist of two conductive plates separated by an insulating material called a dielectric.
They are used to filter out noise in electronic circuits, store energy in flash cameras, and smooth out voltage fluctuations in power supplies.
Capacitance is measured in Farads (F) and determines how much charge a capacitor can store for a given voltage.
Capacitors can be polarized (el...read more
Q74. What is transformer
A transformer is a device that transfers electrical energy between two or more circuits through electromagnetic induction.
Consists of two or more coils of insulated wire wrapped around a core
Primary coil receives electrical energy and induces a magnetic field in the core
Secondary coil receives energy from the magnetic field and transfers it to the load
Used to step up or step down voltage levels in electrical systems
Commonly used in power distribution and transmission systems
Q75. 2. what is nut and bolte?
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
Q76. What are the losses in transformer
Losses in transformers include copper losses, iron losses, and stray losses.
Copper losses occur due to resistance in the windings and are proportional to the square of the current flowing through the transformer.
Iron losses, also known as core losses, include hysteresis losses and eddy current losses in the transformer core material.
Stray losses are caused by leakage flux and are difficult to quantify accurately.
Total losses in a transformer are the sum of copper losses and i...read more
Q77. What is diode types of diode
Diodes are electronic components that allow current to flow in one direction only. Common types include PN junction diodes, Zener diodes, Schottky diodes, and light-emitting diodes (LEDs).
PN junction diodes: Basic diodes that allow current to flow in one direction only.
Zener diodes: Diodes that operate in the reverse breakdown region and are used for voltage regulation.
Schottky diodes: Diodes with a lower forward voltage drop compared to PN junction diodes.
Light-emitting diod...read more
Q78. What is difference between fuse and Mcb
A fuse is a one-time use device that melts when there is an overload, while an MCB is a reusable device that trips when there is an overload.
Fuse is a one-time use device, while MCB is reusable
Fuse needs to be replaced after it melts, MCB can be reset
Fuse operates on the principle of thermal or electrical melting, MCB operates on the principle of electromagnetism
Fuse is slower in response time compared to MCB
Examples: A glass fuse vs a miniature circuit breaker
Q79. 2 phase tranformer what is the
A 2 phase transformer is a type of transformer that has two primary and two secondary windings.
Consists of two primary windings and two secondary windings
Used in certain industrial applications where a 3 phase transformer is not feasible
Less common compared to single phase and 3 phase transformers
Q80. What is the 3 phase tranformer
A 3 phase transformer is a type of transformer that is designed to handle three-phase power distribution systems.
Consists of three sets of primary and secondary windings
Used in power distribution systems to step up or step down voltage in three-phase circuits
Commonly used in industrial and commercial applications
Examples include distribution transformers, power transformers, and autotransformers
Q81. What is a star delta starter
A star delta starter is an electrical motor starting device that reduces the starting current and torque of the motor.
Used for starting high power motors
Consists of a contactor and timer
Initially starts the motor in star configuration and then switches to delta configuration
Reduces starting current and torque
Used in industries such as oil and gas, mining, and manufacturing
Q82. What is 5s in company
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
Q83. What is the function of feedback
Feedback is a process that provides information about the output of a system and allows for adjustments to be made.
Feedback helps in monitoring and controlling the performance of a system.
It provides information about the output of a system and compares it to the desired or expected output.
Feedback allows for adjustments to be made to the system to ensure it operates optimally.
It helps in identifying and correcting errors or deviations from the desired performance.
Feedback is...read more
Q84. How to use transformer
Transformers are used to step up or step down voltage levels in electrical circuits.
Transformers consist of primary and secondary coils wound around a core
Step-up transformers increase voltage levels, while step-down transformers decrease voltage levels
Transformers work on the principle of electromagnetic induction
They are used in power distribution systems, electrical appliances, and electronic devices
Q85. Motor Starter with contactor really protection
Motor starters with contactors provide protection by controlling the electrical supply to the motor.
Motor starters with contactors prevent overload by disconnecting the motor from the power supply when excessive current is detected.
They also protect against short circuits by quickly interrupting the circuit in case of a fault.
Thermal overload relays can be used in conjunction with contactors to provide additional protection by monitoring the motor's temperature.
Motor starters...read more
Q86. 2- Types Of motor?
There are two main types of motors: AC motors and DC motors.
AC motors are powered by alternating current and are commonly used in household appliances and industrial machinery.
DC motors are powered by direct current and are commonly used in electric vehicles and robotics.
Other types of motors include stepper motors, servo motors, and linear motors.
Stepper motors are used in precision control applications, while servo motors are used in robotics and automation.
Linear motors ar...read more
Q87. What are the wark a supervisor
A supervisor in the field of electrical engineering is responsible for overseeing and managing the work of a team or department.
Supervising and coordinating the activities of electrical engineers and technicians
Planning and organizing work schedules and assignments
Ensuring compliance with safety regulations and quality standards
Providing technical guidance and support to team members
Monitoring progress and performance of projects
Resolving any issues or conflicts that arise
Rev...read more
Q88. Difference between AC and DC motor
AC motors use alternating current and are more commonly used for industrial applications, while DC motors use direct current and are often used in household appliances.
AC motors use alternating current, while DC motors use direct current
AC motors are more commonly used in industrial applications, while DC motors are often used in household appliances
AC motors are generally more efficient and require less maintenance compared to DC motors
AC motors are easier to control speed a...read more
Q89. Types of motor and working principle
Types of motors include DC motors, AC motors (induction, synchronous), stepper motors, and servo motors. Each type operates based on different principles.
DC motors operate on the principle of Lorentz force, where a current-carrying conductor experiences a force in a magnetic field.
AC induction motors work on the principle of electromagnetic induction, where a rotating magnetic field induces current in the rotor.
AC synchronous motors operate by synchronizing the speed of the r...read more
Q90. Types of motor and working principles
Types of motors include DC motors, AC motors, synchronous motors, and induction motors. Each type operates based on different principles.
DC motors operate using direct current and have a commutator to switch the current direction, examples include brushed and brushless DC motors.
AC motors operate using alternating current and include types like synchronous motors and induction motors.
Synchronous motors rotate at a constant speed determined by the frequency of the AC power sup...read more
Q91. Type of motor and type of transformer
The type of motor can be AC or DC, while the type of transformer can be step-up or step-down.
AC motors are commonly used in household appliances and industrial machinery.
DC motors are often used in electric vehicles and robotics.
Step-up transformers increase voltage while step-down transformers decrease voltage.
Transformers are used in power distribution systems to transfer electrical energy between different voltage levels.
Q92. Why are used for capacitor
Capacitors are used to store and release electrical energy in circuits.
Capacitors are passive electronic components that can store electrical energy in an electric field.
They are commonly used in power supplies, filters, timing circuits, and audio equipment.
Capacitors can help smooth out voltage fluctuations and reduce noise in electronic circuits.
They can also be used in conjunction with resistors to create timing circuits.
Examples of capacitors include ceramic, electrolytic...read more
Q93. What is motor and principles?
A motor is a device that converts electrical energy into mechanical energy based on the principles of electromagnetism.
A motor consists of a rotor and a stator.
When an electric current flows through the stator windings, it creates a magnetic field.
The interaction between the magnetic field and the rotor's magnetic field causes the rotor to rotate.
Motors can be classified into various types such as DC motors, AC motors, synchronous motors, and induction motors.
Examples of moto...read more
Q94. What is the transformer?
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, that are wound around a core made of magnetic material.
The primary winding is connected to the power source, while the secondary winding is connected to the load.
The transformer operates based on the p...read more
Q95. What do mean by gd?
GD stands for Group Discussion, a method of assessing communication and interpersonal skills of candidates.
GD is a common selection process used by companies to evaluate candidates.
It involves a group of candidates discussing a given topic and presenting their views.
The purpose is to assess communication skills, leadership qualities, and ability to work in a team.
GDs can be structured or unstructured, and may have a moderator to guide the discussion.
Examples of topics for GDs...read more
Q96. What is the conductor
A conductor is a material that allows the flow of electric current.
Conductors have low resistance to the flow of electricity.
Metals like copper and aluminum are commonly used as conductors.
Conductors are used in electrical wiring, circuits, and transmission lines.
Q97. What is the electrical
The electrical resistance is a measure of how much an object opposes the flow of electric current.
Electrical resistance is measured in ohms (Ω).
It is determined by the material and dimensions of an object.
Higher resistance means less current flow.
Example: A light bulb has a high resistance, which causes it to glow when current passes through.
Q98. What is the semi conductor
A semiconductor is a material that has electrical conductivity between that of a conductor and an insulator.
Semiconductors have a band gap that allows them to conduct electricity under certain conditions.
Common semiconductor materials include silicon, germanium, and gallium arsenide.
Semiconductors are used in electronic devices such as transistors, diodes, and integrated circuits.
Q99. Explain the solar power plant maintenance
Solar power plant maintenance involves regular cleaning of panels, inspection of components, and monitoring of performance.
Regularly clean solar panels to remove dirt and debris that can reduce efficiency
Inspect components such as inverters, wiring, and batteries for any signs of wear or damage
Monitor performance metrics like energy output and system efficiency to identify any issues early
Schedule regular maintenance checks by trained professionals to ensure optimal performan...read more
Q100. What is blast furnace
A blast furnace is a type of metallurgical furnace used for smelting to produce industrial metals, generally iron.
Used for smelting iron ores to produce iron
Consists of a furnace chamber with a stack and tuyeres
Operates at high temperatures using coke as fuel
Produces molten iron and slag as byproducts
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