National Projects Construction Corporation Senior Electrical Technician Interview Questions and Answers

Q1. Motor type, Pump lowering, ESR piping etc.
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Q2. Solar Specification
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Q1. Notice period is negotiable
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Q2. 30%hike on current ctc
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General knowlegde, Basic Aptitude, Domain Technical MCQ

Genx vs Genz, Altitude and comparsion

Q1. Components of Transformer
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Components of a transformer include core, windings, and insulation.
• Core: Provides a path for magnetic flux

• Windings: Primary and secondary coils for inducing voltage

• Insulation: Prevents short circuits and ensures safety
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Q2. Question based on series and parallel resistance
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Q1. Difference between MCB and MCCB
Ans. 
MCB is a miniature circuit breaker used for low voltage applications, while MCCB is a molded case circuit breaker used for higher currents and voltages.
• MCB is designed for low voltage applications, typically up to 1000V, while MCCB is designed for higher currents and voltages, typically up to 2500V.

• MCB is usually thermal-magnetic in operation, while MCCB can be thermal-magnetic or electronic trip units.

• MCB is compact i...read more
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Q2. Different types of Breaker
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Different types of breakers include circuit breakers, fuse breakers, and ground fault circuit interrupters.
• Circuit breakers: Automatically switch off electrical circuits during abnormal conditions.

• Fuse breakers: Use a fuse to interrupt the circuit when overloaded.

• Ground fault circuit interrupters (GFCI): Detect imbalances in current flow to prevent electrical shocks.

• Miniature circuit breakers (MCB): Provide protection ...read more
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Q1. Why do you want to do job?
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Q2. Why have you joined Electronics?
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Q3. What is Ohm's law?
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Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.
• Ohm's law is represented by the equation I = V/R, where I is the current, V is the voltage, and R is the resistance.

• It is named after Georg Simon Ohm, a German physicist who first formulated this law.

• This law is applicable to all types of circuits, including DC and AC circuits.

• It is use...read more
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Q1. Testing and commissioning related
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Q2. Work place Safety
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Q1. Circuit breakers & Switchgears
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Q2. What's the Loto system
Ans. 
The Loto system stands for Lockout/Tagout, a safety procedure used to ensure that dangerous machines are properly shut off and not started up again during maintenance or servicing.
• Loto system involves locking the energy-isolating devices with individual lockout devices to prevent the machine from being turned on

• Tagout involves placing a tag on the locked device to indicate that it should not be operated

• Employees workin...read more
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Q1. How much salary expectations
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Q1. What is dol motor starter
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A DOL motor starter is a direct-on-line motor starter used to start and stop motors without any speed control.
• DOL stands for Direct-On-Line.

• It is the simplest and most common type of motor starter.

• It directly connects the motor to the power supply, providing full voltage at start.

• It does not provide any speed control or soft starting.

• DOL starters are typically used for small motors with low starting torque requirements...read more
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Q2. What is earth leakage cercuit breaker
Ans. 
An earth leakage circuit breaker is a safety device that detects and interrupts electrical leakage to earth.
• Also known as a ground fault circuit interrupter (GFCI)

• Protects against electric shock and fire hazards

• Monitors the current flowing through the circuit and trips if it detects a leakage to earth

• Commonly used in bathrooms, kitchens, and outdoor areas where water is present
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Q3. This device protection to human from current
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Q1. I was interviewed for Transmission & Distribution Profile Q1 - Please walk us through your CV and your roles in the various projects ? Q2 - Tell us about design calculations of EHV Cables. How you come up ...read more
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Q2. Q15 - Concepts of HVDC & Offshore Connections
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HVDC is a technology used to transmit high voltage DC power over long distances. Offshore connections refer to power transmission from offshore wind farms.
• HVDC is more efficient than AC transmission over long distances

• Offshore connections require specialized equipment and installation techniques

• HVDC is used for offshore connections to transmit power from offshore wind farms to the mainland

• Examples of HVDC projects incl...read more
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