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I applied via Walk-in and was interviewed in Nov 2021. There were 3 interview rounds.
Resistance is the measure of opposition to the flow of electric current in a material.
Resistance is caused by collisions between electrons and atoms in a material.
It is measured in ohms (Ω).
Resistance can be calculated using Ohm's Law: R = V/I, where R is resistance, V is voltage, and I is current.
Materials with high resistance are called insulators, while materials with low resistance are called conductors.
Examples of...
Current is the flow of electric charge in a circuit.
Current is measured in amperes (A).
It is caused by the movement of electrons or other charged particles.
Current can flow in both directions in an alternating current (AC) circuit.
In a direct current (DC) circuit, current flows in only one direction.
Current can be calculated using Ohm's Law: I = V/R, where I is the current, V is the voltage, and R is the resistance.
Exa...
Composite error and ratio error are two types of errors in current transformers.
Composite error is the combination of ratio error and phase angle error in a current transformer.
Ratio error is the difference between the actual turns ratio and the specified turns ratio of a current transformer.
Phase angle error is the angular difference between the primary and secondary currents of a current transformer.
Composite error a...
An AC drive circuit diagram controls the speed of an AC motor by varying the frequency and voltage of the power supplied to it.
An AC drive consists of a rectifier, DC link, inverter, and control circuitry.
The rectifier converts AC power to DC power, which is stored in the DC link.
The inverter converts the DC power back to AC power with variable frequency and voltage.
The control circuitry adjusts the frequency and volta...
A single line diagram of a distribution system is required with proper specifications.
The diagram should show the flow of power from the source to the load
It should include all components such as transformers, switchgear, and cables
The specifications should include voltage levels, power ratings, and protection devices
The diagram should follow standard symbols and conventions
Example: A 11 kV distribution system with a 5
Dewpoint test is done in transformer to check the moisture content in the insulation oil.
Moisture in insulation oil can cause breakdown of transformer insulation
Dewpoint test helps to determine the moisture content in the oil
It is a preventive maintenance measure to avoid transformer failure
The test involves cooling a mirror until dew forms on it, and measuring the temperature at which dew forms
Power transformers are used in transmission systems to step up or down voltage, while distribution transformers are used in distribution systems to step down voltage.
Power transformers are used in high voltage transmission systems to step up or down voltage for long distance transmission.
Distribution transformers are used in low voltage distribution systems to step down voltage for local distribution.
Power transformers...
Buchholz relay is used to protect transformers from faults by detecting gas and oil flow abnormalities.
Buchholz relay is installed in the pipe connecting the transformer tank and conservator tank.
It operates based on the principle that faults in the transformer generate gases and cause oil flow disturbances.
When gas or oil flow abnormalities occur, the relay trips and sends a signal to the control panel to isolate the ...
The chance of survival depends on various factors such as insulation, grounding, and the strength of the electrical surge.
The chance of survival depends on the insulation of the car, as it acts as a barrier against electrical current.
If the car is properly grounded, it can help dissipate the electrical surge and reduce the risk of injury.
The strength of the electrical surge also plays a crucial role in determining the ...
I applied via Naukri.com and was interviewed before Oct 2021. There were 2 interview rounds.
I applied via Company Website and was interviewed in Jul 2021. There were 3 interview rounds.
EOt crane is an electric overhead traveling crane used for lifting and moving heavy loads in industrial settings.
EOt stands for Electric Overhead Traveling
It is operated by an electrical control system
It consists of a bridge, hoist, trolley, and electrical components
It is commonly used in factories, warehouses, and construction sites
It can lift and move heavy loads up to several tons
It requires regular maintenance and
posted on 2 Sep 2023
posted on 29 Nov 2022
I applied via Walk-in and was interviewed in May 2022. There was 1 interview round.
The capacity of a furnace refers to its heating output, typically measured in BTUs or tons.
Furnace capacity is determined by the amount of heat it can produce.
It is usually measured in BTUs (British Thermal Units) or tons.
Higher capacity furnaces can produce more heat and are suitable for larger spaces.
For example, a furnace with a capacity of 80,000 BTUs can heat a larger area compared to one with a capacity of 40,000
Drive components in CCM department are the parts that enable the motor to function properly.
Drive components include motors, gears, belts, and pulleys.
They work together to transfer power from the motor to the machine.
The components must be properly sized and aligned to ensure efficient operation.
Examples of machines that use drive components include conveyor belts, pumps, and fans.
Control diagram of a motor with remote and local start using star delta starter.
Use a star delta starter for reduced voltage starting
Include a remote start/stop switch in the control circuit
Use a contactor to switch between star and delta connections
Include overload protection in the circuit
Use a control transformer to step down voltage for control circuit
Include a pilot light to indicate motor status
I appeared for an interview in Jan 2024.
Power factor is the ratio of real power to apparent power in an AC circuit. VFD stands for Variable Frequency Drive. AC motors run on alternating current while DC motors run on direct current.
Power factor is a measure of how effectively electrical power is being used in a circuit.
It is calculated by dividing the real power (in watts) by the apparent power (in volt-amperes).
A power factor of 1 indicates that all the pow...
Types of load cells include strain gauge load cells, hydraulic load cells, and capacitive load cells.
Strain gauge load cells measure the strain or deformation of a material.
Hydraulic load cells use hydraulic fluid to measure force.
Capacitive load cells measure changes in capacitance to determine force.
Other types of load cells include piezoelectric load cells and pneumatic load cells.
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