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DC motors use direct current to generate rotational motion, while AC motors use alternating current.
DC motors have a commutator and brushes to switch the current direction, while AC motors do not.
AC motors are more commonly used in household appliances, while DC motors are used in electric vehicles and industrial machinery.
Examples of DC motors include brushed and brushless motors, while examples of AC motors include i
There are two types of current - AC and DC.
AC stands for Alternating Current and changes direction periodically.
DC stands for Direct Current and flows in one direction only.
AC is used for power transmission over long distances while DC is used for electronic devices.
Examples of AC sources include power grids and generators while batteries are a common source of DC.
AC voltage can be stepped up or down using transformers...
I studied various subjects related to electrical engineering in my college.
Electrical Machines
Power Electronics
Control Systems
Electrical Measurements and Instrumentation
Electromagnetic Theory
Digital Electronics
Microprocessors and Microcontrollers
Power Systems
Renewable Energy Sources
Electrical Circuit Analysis
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 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
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 ...
I applied via Company Website and was interviewed before Jan 2022. There were 2 interview rounds.
I applied via Company Website and was interviewed in Feb 2022. There was 1 interview round.
I applied via Naukri.com and was interviewed before Oct 2021. There were 2 interview rounds.
I applied via Referral and was interviewed before May 2023. There was 1 interview round.
posted on 24 Jun 2024
I applied via Walk-in and was interviewed before Jun 2023. There were 2 interview rounds.
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