Neelachal Ispat Nigam Electrical Technician Interview Questions and Answers

Q1. Explain about transformer and its components
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Q2. Explain about photovoltaic cell
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Q3. Explain about inverters
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Q4. Which electrical components are placed in grid substation
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Q1. What is the mucromiter list count
Ans. 
The micrometer list count refers to the number of items or components listed in a micrometer measurement tool.
• The micrometer list count is the total number of items listed on a micrometer measurement tool

• It helps in accurately measuring the dimensions of small objects or components

• For example, a micrometer list count of 0.01mm indicates that the tool can measure up to 0.01mm precision
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Q2. What is the list count of varniya caliper
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The list count of varniya caliper is typically 0, as varniya caliper is not a standard or commonly used tool in the field of measurement.
• Varniya caliper is not a standard tool in the field of measurement

• There is no specific list count for varniya caliper as it is not commonly used

• It is important to use standard calipers for accurate measurements
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Q3. Which material of drill bit
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The material of the drill bit depends on the type of material being drilled and the desired outcome.
• Drill bits can be made of high-speed steel, cobalt steel, carbide, or diamond.

• High-speed steel drill bits are versatile and suitable for drilling wood, plastic, and soft metals.

• Cobalt steel drill bits are harder and more heat-resistant, making them ideal for drilling hard metals.

• Carbide drill bits are extremely hard and ...read more
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Q4. Types of center punch
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Center punches are tools used to make small indentations in metal or other materials for drilling or marking purposes.
• Automatic center punch: Spring-loaded for easy one-handed operation

• Manual center punch: Requires a hammer to create the indentation

• Transfer punch: Used for transferring hole locations from one material to another

• Prick punch: Has a sharper point for more precise marking
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Q5. What types extrusion press
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Extrusion presses are used to create products with a consistent cross-sectional profile by forcing material through a die.
• There are different types of extrusion presses based on the method of operation, such as direct extrusion press, indirect extrusion press, and impact extrusion press.

• Direct extrusion presses push the material through the die using a ram, while indirect extrusion presses pull the material through the...read more
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Q6. Center punch and dot punch angle
Ans. Center punch angle 90 Dot punch angle 60
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All type crusher equipment sarvice

All type crusher equipment sarvice

Q1. Types of crusher ,and plant
Ans. 
There are various types of crushers and plants used in industries for crushing and processing materials.
• Types of crushers include jaw crushers, cone crushers, impact crushers, and gyratory crushers.

• Plants used for crushing and processing materials include stationary plants, portable plants, and mobile plants.

• Crushers and plants are used in industries such as mining, construction, and recycling.
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Q2. Types of tools and Tourq
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Tools are classified into hand tools, power tools, cutting tools, measuring tools, and torque wrenches are used to apply a specific amount of torque to a fastener.
• Hand tools include hammers, screwdrivers, pliers, wrenches, etc.

• Power tools include drills, saws, sanders, grinders, etc.

• Cutting tools include scissors, knives, shears, etc.

• Measuring tools include rulers, tape measures, calipers, etc.

• Torque wrenches are used ...read more
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Q3. Nut and bolt types
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Q4. Types of washers
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Washers are thin plates with a hole in the center used to distribute load and prevent damage to surfaces.
• Flat washers: used to distribute load and prevent damage to surfaces

• Lock washers: used to prevent nuts and bolts from loosening

• Spring washers: used to absorb shock and vibration

• Belleville washers: used to compensate for thermal expansion or contraction

• Wave washers: used to provide flexibility and prevent loosening

• C-
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Q5. Types of spaner
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Spanners are tools used to tighten or loosen nuts and bolts. There are various types of spanners available for different purposes.
• Open-end spanner

• Ring spanner

• Combination spanner

• Adjustable spanner

• Pipe wrench

• Socket wrench

• Torque wrench
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Q1. Dol and star delta wiring scheme
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DOL (Direct-On-Line) and star delta are two different wiring schemes used in electrical engineering for starting induction motors.
• DOL wiring directly connects the motor to the power supply for starting, while star delta wiring initially starts the motor in star configuration and then switches to delta configuration for running.

• DOL wiring is simpler and cheaper but causes high starting current, while star delta wiring r...read more
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Q1. Wiring MCB bord switch
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Q2. Yes wiring board switchMCB
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Q1. I am working from Grid sub station . Transformer... CT PT CVT EARTHING PTW
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Q2. All about 132 kv Gss
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Hard work versus smart work.

Q1. Why power plug earth wire is bigger in size?
Ans. 
The power plug earth wire is bigger in size to ensure safety and prevent electrical shocks.
• The earth wire provides a path for the current to flow in case of a fault or short circuit.

• A larger wire size reduces resistance and allows for the safe dissipation of excess current.

• It helps to protect individuals and equipment from electric shock hazards.

• The earth wire is connected to the ground, which acts as a reference point...read more
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Q2. Which conductor of same size will take larger current Al or Cu?
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Copper (Cu) conductor will take larger current than Aluminum (Al) conductor of the same size.
• Copper has a higher electrical conductivity than Aluminum.

• Copper has a lower resistivity than Aluminum.

• Copper has better thermal conductivity than Aluminum.

• Copper is more commonly used in high-current applications.

• Aluminum is often used in overhead power transmission lines due to its lighter weight.
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Q3. What is pulse width modulation in VFD?
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Pulse width modulation (PWM) is a technique used in VFD to control the speed of the motor by adjusting the width of the pulses of voltage supplied to the motor.
• PWM is a method of controlling the amount of power delivered to a load without changing the voltage level.

• In VFD, PWM is used to control the speed of the motor by varying the width of the pulses of voltage supplied to the motor.

• The width of the pulses is control...read more
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