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I was interviewed before Dec 2019.
Elevator is a vertical transportation device that moves people or goods between floors of a building.
Elevators are powered by electric motors that drive traction cables or hydraulic pistons.
They have safety features such as emergency brakes, overspeed governors, and door interlocks.
Elevators can be controlled by various systems such as relay logic, microprocessors, or destination dispatch.
Modern elevators also have fea...
There are mainly two types of motors used in elevators: AC and DC motors.
AC motors are commonly used in high-rise buildings and have a longer lifespan.
DC motors are used in low-rise buildings and are more energy-efficient.
AC motors are more expensive than DC motors.
AC motors have a higher starting torque than DC motors.
Examples of AC motors used in elevators include induction motors and synchronous motors.
Examples of D...
AC drives control the speed of AC motors by varying the frequency of the electrical supply.
AC drives use power electronics to convert AC power to DC power and then back to AC power at the desired frequency.
Different types of starters include direct-on-line (DOL), star-delta, soft starters, and variable frequency drives (VFDs).
DOL starters provide full voltage to the motor, while star-delta starters reduce the voltage d...
Oil lubricant is used in elevators to reduce friction and wear on moving parts.
Oil lubricant reduces friction between moving parts in elevators.
It helps to prevent wear and tear on elevator components.
Oil lubricant also helps to dissipate heat generated by friction.
Different types of oil lubricants are used depending on the elevator's design and usage.
Regular maintenance and oil changes are necessary to ensure proper e
A battery converts chemical energy into electrical energy. For example, a lead-acid battery used in cars.
Batteries work by converting chemical energy into electrical energy
Common types of batteries include lead-acid, alkaline, lithium-ion, and nickel-cadmium
Lead-acid batteries are commonly used in cars and work by converting lead and lead oxide into lead sulfate
Alkaline batteries use zinc and manganese dioxide to creat...
A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.
Transformers work on the principle of electromagnetic induction.
They consist of two or more coils of wire, known as windings, which are wound around a core made of magnetic material.
When an alternating current (AC) flows through the primary winding, it creates a changing magnetic field i...
The latest motor used in elevators is the permanent magnet synchronous motor (PMSM).
PMSM is more energy-efficient and has a higher power density than traditional motors.
It uses rare-earth magnets to create a magnetic field that rotates the motor shaft.
PMSM is also quieter and requires less maintenance than other motors.
Examples of elevators that use PMSM include Otis Gen2 and KONE MonoSpace 500.
Synchronous motors are used to maintain constant speed and power supply in industrial applications.
Synchronous motors have a rotor with permanent magnets that rotate at the same speed as the stator's magnetic field.
They are used in applications where constant speed is required, such as in electric power generation, industrial machinery, and robotics.
Synchronous motors are also used in applications where precise control...
I was interviewed before Sep 2016.
I applied via Recruitment Consultant and was interviewed before Sep 2018. There were 4 interview rounds.
I was interviewed in Jul 2017.
I am a software engineer with experience in developing and maintaining software applications.
I have a strong background in programming languages such as Java, C++, and Python.
I have worked on various projects, including developing web applications and implementing software solutions.
I am skilled in problem-solving and debugging, ensuring efficient and effective software development.
I have experience in collaborating wi...
I learned valuable teamwork and problem-solving skills during my summer internship.
Developed strong collaboration skills by working with a team of software engineers to complete projects
Gained experience in troubleshooting and debugging software issues
Learned to effectively communicate and present technical concepts to both technical and non-technical stakeholders
Improved problem-solving abilities by identifying and re...
Java is an object-oriented language while C is a procedural language.
Java is platform-independent while C is platform-dependent.
Java has automatic garbage collection while C requires manual memory management.
Java has built-in support for multithreading while C requires external libraries.
Java has a larger standard library compared to C.
Java is more secure than C due to its strong type checking and exception handling.
C ...
Pointers are variables that store memory addresses of other variables in programming languages.
Pointers allow direct access and manipulation of memory locations.
They are commonly used in programming languages like C and C++.
Pointers can be used to pass variables by reference, allowing modifications to the original value.
They can also be used to dynamically allocate memory.
Example: int* ptr; // declares a pointer to an
In 5 years, I see myself as a senior software engineer leading a team of developers.
Leading a team of developers
Working on complex projects
Continuing to learn and grow in my role
Contributing to the success of the company
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