Burns & McDonnell Electrical Designer Interview Questions and Answers

General knowlegde, Basic Aptitude, Domain Technical MCQ

Genx vs Genz, Altitude and comparsion

Q1. Components of Transformer
Ans. 
Components of a transformer include core, windings, and insulation.
• Core: Provides a path for magnetic flux

• Windings: Primary and secondary coils for inducing voltage

• Insulation: Prevents short circuits and ensures safety
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Q2. Question based on series and parallel resistance
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Q1. Difference between MCB and MCCB
Ans. 
MCB is a miniature circuit breaker used for low voltage applications, while MCCB is a molded case circuit breaker used for higher currents and voltages.
• MCB is designed for low voltage applications, typically up to 1000V, while MCCB is designed for higher currents and voltages, typically up to 2500V.

• MCB is usually thermal-magnetic in operation, while MCCB can be thermal-magnetic or electronic trip units.

• MCB is compact i...read more
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Q2. Different types of Breaker
Ans. 
Different types of breakers include circuit breakers, fuse breakers, and ground fault circuit interrupters.
• Circuit breakers: Automatically switch off electrical circuits during abnormal conditions.

• Fuse breakers: Use a fuse to interrupt the circuit when overloaded.

• Ground fault circuit interrupters (GFCI): Detect imbalances in current flow to prevent electrical shocks.

• Miniature circuit breakers (MCB): Provide protection ...read more
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Q1. Tell us about your experience
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Q1. Earthing design
Ans. Explain Earthing design using excel or any earthing design software
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Q2. Cable Sizing calculation
Ans. Explain step by step procedure of Cable Sizing
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Q3. How to handle designers in tough time
Ans. 
Communicate openly, provide support, set clear expectations, offer solutions
• Communicate openly with designers to understand their challenges and concerns

• Provide support and resources to help designers overcome tough times

• Set clear expectations and goals to keep designers focused and motivated

• Offer solutions and brainstorm ideas together to find the best way forward
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Q4. Explain your individual contribution to the project
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Q1. Testing and commissioning related
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Q2. Work place Safety
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Q1. Circuit breakers & Switchgears
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Q2. What's the Loto system
Ans. 
The Loto system stands for Lockout/Tagout, a safety procedure used to ensure that dangerous machines are properly shut off and not started up again during maintenance or servicing.
• Loto system involves locking the energy-isolating devices with individual lockout devices to prevent the machine from being turned on

• Tagout involves placing a tag on the locked device to indicate that it should not be operated

• Employees workin...read more
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Q1. How much salary expectations
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Q1. Self introduction & previous company experience
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Q1. I was interviewed for Transmission & Distribution Profile Q1 - Please walk us through your CV and your roles in the various projects ? Q2 - Tell us about design calculations of EHV Cables. How you come up ...read more
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Q2. Q15 - Concepts of HVDC & Offshore Connections
Ans. 
HVDC is a technology used to transmit high voltage DC power over long distances. Offshore connections refer to power transmission from offshore wind farms.
• HVDC is more efficient than AC transmission over long distances

• Offshore connections require specialized equipment and installation techniques

• HVDC is used for offshore connections to transmit power from offshore wind farms to the mainland

• Examples of HVDC projects incl...read more
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