National Institute of Technology Technician Interview Questions and Answers

Q1. HOW DO YOU CONVERT A VOLTMETER TO AMMETER ? WHAT ARE THE CHANGES TO BE DONE FOR DOING THAT? DRAW THE RELEVANT CIRCUIT?
Ans. 
To convert a voltmeter to an ammeter, a shunt resistor is added in parallel to the meter to measure current instead of voltage.
• Add a shunt resistor in parallel to the voltmeter to convert it to an ammeter.

• Calculate the shunt resistor value using Ohm's Law (R = V/I) based on the desired current range.

• Connect the shunt resistor in parallel to the voltmeter with proper polarity.

• Ensure the shunt resistor has a low resistan...read more
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Q2. TYPE OF LIGHTING SYSTEM ADOPTED IN PETROL PUMP STATIONS?
Ans. 
Most petrol pump stations use LED lighting systems for energy efficiency and cost savings.
• LED lighting systems are commonly used in petrol pump stations

• LED lights provide bright and uniform illumination for safety and security

• LED lights are energy efficient and cost effective, saving on electricity bills

• LED lights have a longer lifespan compared to traditional lighting systems

• Some petrol pump stations may also use sola
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Q3. DIFFERENT TYPES OF SPEED CONTROL METHODS IN DC MOTOR?
Ans. 
Different types of speed control methods in DC motor include armature voltage control, field flux control, and armature resistance control.
• Armature voltage control: Adjusting the voltage applied to the armature to control speed.

• Field flux control: Changing the field flux to regulate the speed of the motor.

• Armature resistance control: Varying the armature resistance to adjust the speed of the motor.
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Q4. WHY CT SECONDARY SHOULD NOT BE OPEN CIRCUITED?
Ans. 
CT secondary should not be open circuited as it can lead to dangerous high voltage spikes and damage the equipment.
• Open circuiting the CT secondary can lead to dangerous high voltage spikes due to no current flow.

• It can damage the CT and other connected equipment.

• It can also lead to inaccurate measurements and incorrect readings.

• Short circuiting the CT secondary is a safer option to prevent high voltage spikes.

• Proper g...read more
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Q5. HIGHEST TRANSMISSION VOLTAGE IN INDIA?
Ans. 
The highest transmission voltage in India is 1200 kV.
• Highest transmission voltage in India is 1200 kV

• This voltage level is used for long-distance transmission of electricity

• It helps in reducing transmission losses and improving efficiency
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Q6. EXPLAIN ARMATURE REACTION?
Ans. 
Armature reaction is the effect of magnetic field produced by armature current on the main magnetic field in a DC machine.
• Armature reaction occurs in DC machines when current flows through the armature winding, creating a magnetic field.

• This magnetic field interacts with the main magnetic field, causing distortion and shifting of the neutral plane.

• Armature reaction affects the commutation process and can lead to sparki...read more
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Q7. DRAW THE SINGLE LINGE DIAGRAM OF POWER TRANSMISSION AND DISTRIBUTION?
Ans. 
A single line diagram is a simplified representation of a power system showing the main components and their connections.
• Single line diagrams show the main components of a power system such as generators, transformers, transmission lines, and distribution lines.

• Each component is represented by a simple symbol with lines connecting them to show how they are interconnected.

• For example, a generator is represented by a cir...read more
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Q8. DESCRIBE ARC QUENCHING IN SF6 CIRCUIT BREAKER?
Ans. 
Arc quenching in SF6 circuit breaker involves the use of sulfur hexafluoride gas to rapidly extinguish the arc.
• SF6 gas is used as the quenching medium due to its high dielectric strength and excellent arc-extinguishing properties.

• When the circuit breaker detects an arc, the SF6 gas is rapidly injected into the arc zone to cool and extinguish it.

• The high thermal conductivity of SF6 helps in quickly dissipating the heat ...read more
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Q9. EXPLAIN DISTANCE PROTECTION RELAY?
Ans. 
Distance protection relay is a type of protective relay used in power systems to protect transmission lines from faults.
• Distance protection relay operates based on the impedance seen by the relay from the fault point.

• It measures the distance to the fault by comparing the impedance to a pre-set value.

• It is commonly used in high voltage transmission lines to quickly isolate faults and prevent damage to the system.

• Example...read more
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Q10. WHAT IS ROLE OF MHO RELAY?
Ans. 
The role of MHO relay is to provide distance protection for power lines by measuring the impedance of the line and tripping the circuit breaker if a fault is detected.
• Provides distance protection for power lines

• Measures impedance of the line

• Trips the circuit breaker if a fault is detected
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Q11. EXPLAIN ABOUT PERMANENT LOSSES IN TRANSFOMER?
Ans. 
Permanent losses in transformers refer to losses that occur continuously during operation and cannot be recovered.
• Permanent losses include core losses (eddy current and hysteresis losses) and copper losses (due to resistance in windings).

• Core losses are constant and occur even when the transformer is idle.

• Copper losses increase with the load on the transformer.

• Permanent losses result in reduced efficiency and increased...read more
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Q12. TELL ME ABOUT BUCHOLZ RELAY ?
Ans. 
Buchholz relay is a protective device for oil-filled transformers and reactors, used to detect and prevent internal faults.
• It is a gas and oil-operated relay

• Monitors the gas accumulation in the oil tank

• Triggers an alarm or trips the transformer if gas levels exceed the set limit

• Helps in preventing catastrophic failures in transformers
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Q13. WHY TRANSFOMER CORE IS LAMINATED?
Ans. 
Transformer core is laminated to reduce eddy current losses and improve efficiency.
• Laminating the core reduces eddy current losses

• Lamination helps in improving the efficiency of the transformer

• Prevents overheating of the core

• Increases the resistance of the core to magnetic flux
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Q14. WHY SERIES MOTOR SHOULDN'T BE STARTED WITHOUT NO LOAD?
Ans. 
Series motor shouldn't be started without no load to prevent damage due to high starting current.
• Starting a series motor without a load can result in high starting current which can damage the motor windings.

• Without a load, the motor can run at dangerously high speeds which can also lead to damage.

• The absence of a load can cause the motor to overheat due to lack of cooling.

• Starting a series motor without a load can als...read more
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Q15. DESCRIBE GIS SUBSTATION?
Ans. 
A GIS substation is a high voltage substation that uses gas-insulated switchgear for electrical insulation.
• Uses gas-insulated switchgear for electrical insulation

• Compact design compared to traditional air-insulated substations

• Requires less maintenance

• Provides higher reliability and safety

• Commonly used in urban areas with space constraints
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Q16. EXPLAIN SYNHRONOUS MOTOR STARTING METHODS ? WHY IT IS NOT SELF STARTING ?
Ans. 
Synchronous motors require external starting methods due to their design and characteristics.
• Synchronous motors need to be brought up to synchronous speed before they can start operating efficiently.

• Common starting methods include using a pony motor, damper winding, or a frequency converter.

• Synchronous motors are not self-starting because they operate at a fixed speed determined by the frequency of the power supply.

• The...read more
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Q17. EXPLAIN INDUCTION GENERATOR?
Ans. 
An induction generator is a type of asynchronous generator that produces electrical power by induction.
• Induction generators are commonly used in wind turbines to convert mechanical energy into electrical energy.

• They do not require a separate excitation system like synchronous generators.

• Induction generators operate at a slightly sub-synchronous speed to generate power.

• They are self-starting and do not require external ...read more
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Q1. DESCRIBE HOLDING CURRENT?
Ans. 
Holding current is the minimum current required to keep a device or component in the on state.
• Holding current is essential for maintaining the operation of devices like relays and transistors.

• It ensures that the device remains in the on state even after the triggering current is removed.

• For example, in a relay, holding current is the current needed to keep the relay contacts closed.

• Holding current is typically lower th
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Q2. DESCRIBE LATCHING CURRENT?
Ans. 
Latching current is the minimum current required to keep a device in the ON state after it has been turned on.
• Latching current is essential for maintaining the ON state of a device.

• It is typically higher than the holding current required to initially turn on the device.

• Latching current is crucial in devices like relays and latching solenoids.

• If the latching current is not met, the device may switch off unexpectedly.
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Q1. What are rest api
Ans. 
REST API stands for Representational State Transfer Application Programming Interface, used for communication between software systems.
• REST API is a set of rules and conventions for building and interacting with web services.

• It uses standard HTTP methods like GET, POST, PUT, DELETE to perform CRUD operations.

• REST APIs are stateless, meaning each request from a client to the server must contain all the information neede
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Q2. What are the project key role
Ans. 
Project key roles are essential positions within a project team responsible for specific tasks and deliverables.
• Project Manager: oversees the project from initiation to completion

• Software Engineer: responsible for developing and implementing software solutions

• Quality Assurance Analyst: ensures the quality of the software through testing

• Business Analyst: gathers and analyzes requirements from stakeholders

• UI/UX Designer:...read more
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Prepare your CV thoroughly.

Q1. Tell me about yourself
Ans. 
I am a dedicated and experienced consultant with a strong background in problem-solving and client management.
• Over 5 years of experience in consulting roles

• Skilled in analyzing data and providing strategic recommendations

• Proven track record of successfully managing client relationships

• Strong communication and presentation skills

• Certified in relevant consulting methodologies
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Q2. Past experience
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Q3. CV related quaestions
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Asked for excel test and tested my email etiquette .

Q1. Where do you stay
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Q2. How do you travel
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Q1. It was all general questions
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Q2. A few SQL related questions
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Coding test are assessments that are designed to evaluate a developer's coding skills and aptitude.

An aptitude test is an exam used to determine an individual's skill or propensity to succeed in a given activity

Q1. How do you align to our proect
Ans. 
I align with your project by understanding the goals, values, and expectations of the organization and ensuring my work contributes to its success.
• Researching and familiarizing myself with the project goals and objectives

• Communicating effectively with team members to ensure alignment

• Adapting my skills and expertise to meet the project requirements

• Seeking feedback and making adjustments as needed

• Prioritizing tasks based
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Q2. Explain your previous experience
Ans. 
I have 2 years of experience in marketing and social media management for a tech startup.
• Managed social media accounts and created engaging content

• Developed and implemented marketing strategies to increase brand awareness

• Analyzed data to track the success of campaigns
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Easy moderate 40 questions were there

Q1. Explain your projects
Ans. 
I have worked on various projects including a web development project, a data analysis project, and a machine learning project.
• Developed a website using HTML, CSS, and JavaScript for a local business

• Conducted data analysis on customer feedback data to identify trends and insights

• Implemented a machine learning model to predict customer churn for a telecom company
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Q2. What is your management style
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My management style is collaborative and empowering, focusing on communication and teamwork.
• I believe in open communication and transparency within the team.

• I empower team members to take ownership of their work and make decisions.

• I value teamwork and collaboration, encouraging input from all team members.

• I provide support and guidance to help team members grow and develop their skills.

• I believe in setting clear goals
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