Service Equipment Company Interview Questions and Answers

Star delta panel requires specific components for motor control, ensuring efficient operation and reduced starting current.

• 1. Contactor: Essential for switching the motor on and off.

• 2. Overload Relay: Protects the motor from overheating due to overload.

• 3. Timer: Controls the transition between star and delta configurations.

• 4. Fuses: Provides protection against short circuits.

• 5. Wiring: Proper gauge and type of wiring t...read more

For a 22 kW load, the MCCB rating should be calculated based on the current and safety factors.

• Power (P) = Voltage (V) x Current (I) x √3 for three-phase systems.

• For a 22 kW load at 400V: I = P / (√3 x V) = 22,000 / (1.732 x 400) ≈ 31.8 A.

• Consider a safety factor (1.25 to 1.5) for MCCB rating.

• Thus, MCCB rating should be around 40 A to ensure safety.

To calculate the current in amps for a 22 kW load, use the formula: Current (I) = Power (P) / Voltage (V).

• For a 3-phase system, use I = P / (√3 × V). Example: For 400V, I = 22000 / (√3 × 400) ≈ 31.7A.

• For a single-phase system, use I = P / V. Example: For 230V, I = 22000 / 230 ≈ 95.7A.

• Ensure to consider power factor if applicable, especially in AC circuits.

Yes, I am proficient in advanced Excel including functions, formulas, pivot tables, and macros.

• Proficient in using functions and formulas in Excel

• Skilled in creating and analyzing pivot tables

• Experience in automating tasks with macros

• Familiar with data visualization techniques in Excel