Electrical Testing Commissioning Engineer

Electrical Testing Commissioning Engineer Interview Questions and Answers

Updated 24 Apr 2024

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Q1. What is a switchgear and what is a switchyard

Ans.

Switchgear is an electrical device used to control, protect, and isolate electrical equipment. Switchyard is an outdoor area where high-voltage electrical equipment is installed.

Switchgear is used to control and protect electrical equipment, such as transformers, generators, and motors.
It is designed to handle high voltages and currents and includes devices like circuit breakers, fuses, and relays.
Switchgear can be found in various settings, including power plants, substation...read more

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Q2. What is the motor and give some explanation

Ans.

A motor is an electrical device that converts electrical energy into mechanical energy.

Motors are used in various applications such as fans, pumps, compressors, and conveyor systems.
They work on the principle of electromagnetic induction.
The two main types of motors are AC motors and DC motors.
AC motors are commonly used in household appliances while DC motors are used in electric vehicles and robotics.
Motors require regular maintenance to ensure optimal performance and longe...read more

Q3. What do you think about electrical power system

Ans.

Electrical power systems are essential for distributing and managing electricity efficiently.

Electrical power systems consist of generators, transformers, transmission lines, and distribution networks.
They play a crucial role in supplying electricity to homes, businesses, and industries.
Proper design, installation, testing, and maintenance of electrical power systems are essential to ensure safety and reliability.
Issues such as voltage fluctuations, power outages, and equipme...read more

Q4. What are the types of breakers

Ans.

Types of breakers include circuit breakers, fuse breakers, and earth leakage circuit breakers.

Circuit breakers: Automatically switch off electrical circuits during abnormal conditions.
Fuse breakers: Use a fuse to interrupt the circuit when current exceeds a certain level.
Earth leakage circuit breakers: Detects leakage current and disconnects the circuit to prevent electric shock.
Examples: Miniature circuit breaker (MCB), Residual current circuit breaker (RCCB), Molded case ci...read more

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Q5. Pn junction for 3 conditions

Ans.

Pn junction refers to the interface between a p-type and n-type semiconductor material, exhibiting different behaviors under forward bias, reverse bias, and breakdown conditions.

Under forward bias, electrons and holes are pushed towards the junction, allowing current to flow easily.
Under reverse bias, the junction acts as a barrier to current flow, with only a small leakage current passing through.
In breakdown condition, the reverse bias voltage is so high that the junction b...read more

Q6. Inform all company benefits

Ans.

Company benefits include health insurance, retirement plans, paid time off, and professional development opportunities.

Health insurance coverage for employees and their families
Retirement plans such as 401(k) with employer matching
Paid time off for vacation, sick leave, and holidays
Professional development opportunities like training programs or tuition reimbursement

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