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A petrol engine works by igniting a mixture of fuel and air inside a cylinder to create a controlled explosion that powers the engine.
Fuel and air are mixed in the carburetor or fuel injection system
The mixture is compressed by a piston inside a cylinder
A spark plug ignites the mixture, causing a controlled explosion
The explosion pushes the piston down, which turns the crankshaft and powers the engine
The exhaust gases
Diesel engines work by compressing air and fuel in a cylinder, causing combustion and driving a piston.
Air is drawn into the cylinder and compressed by a piston.
Fuel is injected into the cylinder and ignites due to the high temperature and pressure.
The resulting explosion drives the piston, which turns the crankshaft and powers the engine.
Diesel engines are commonly used in trucks, buses, and heavy equipment due to the
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posted on 3 May 2019
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 ...
posted on 6 Jul 2017
I appeared for an interview before Jul 2016.
posted on 14 Sep 2022
I applied via Approached by Company and was interviewed before Sep 2021. There was 1 interview round.
I applied via Company Website and was interviewed in Nov 2020. There were 3 interview rounds.
posted on 27 Jun 2023
I applied via Recruitment Consulltant and was interviewed in May 2023. There were 3 interview rounds.
I applied via Company Website and was interviewed in Jul 2021. There was 1 interview round.
posted on 12 Aug 2024
MCC stands for Motor Control Center and PCC stands for Power Control Center. They are electrical panels used to control and distribute power to motors and other electrical equipment.
MCC panels are used to control and distribute power to motors in industrial settings.
PCC panels are used to control and distribute power to various electrical equipment.
Both panels play a crucial role in ensuring efficient and safe operatio...
posted on 4 Nov 2023
I applied via LinkedIn and was interviewed in Oct 2023. There were 2 interview rounds.
An induction motor is a type of AC motor where power is supplied to the rotor by electromagnetic induction.
Induction motors are commonly used in various applications such as industrial machinery, pumps, fans, and compressors.
They do not require brushes to transfer power to the rotor, making them more reliable and maintenance-free compared to brushed DC motors.
The speed of an induction motor is determined by the frequen...
A DC series motor is a type of DC motor where the field winding is connected in series with the armature winding.
Field winding and armature winding are connected in series
High starting torque but low speed
Used in applications where high starting torque is required, such as in traction applications
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