Durr India Electrical Design Engineer Interview Questions and Answers

Q1. Basic DOL diagram and drawing DOL Circuit
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Q2. How to select plc and cards
Ans. 
PLC and card selection depends on the application requirements and budget.
• Identify the required inputs and outputs

• Consider the communication protocols needed

• Evaluate the processing power and memory requirements

• Determine the budget and cost of ownership

• Research and compare different brands and models

• Consider the availability of technical support and spare parts

• Ensure compatibility with existing systems

• Consider the envir
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Q1. Draw the star delta controlling
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Star delta controlling is a method used to reduce the starting current of induction motors.
• Star delta controlling involves initially connecting the motor windings in a star configuration for starting, then switching to a delta configuration for running.

• It is commonly used for large induction motors to reduce the starting current and torque.

• The transition from star to delta configuration is typically controlled by a mot...read more
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Q2. How many contactor use in star delta??
Ans. 
In star delta connection, typically two contactors are used.
• In star delta connection, one contactor is used for star connection and another contactor is used for delta connection.

• The star contactor is typically rated for the current of one winding, while the delta contactor is rated for the full motor current.

• Using two contactors helps in reducing the starting current and torque in the motor.

• For example, a 3-phase moto...read more
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Q3. Draw the single line diagram for DOL.
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Single line diagram for DOL is a simple representation of Direct-On-Line motor starter circuit.
• DOL starter consists of a contactor, overload relay, and start/stop push buttons.

• The single line diagram shows the connections between these components.

• The power supply is connected to the contactor, which is then connected to the motor.

• The overload relay is connected in series with the motor to protect it from overloading.

• St...read more
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Q1. How many years experience in electrical technician in India
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Q2. Dubai UAE all futain
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Q3. Johnson controls Chennai oragadam
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Q4. Melcon private limited Chennai
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How to make new project in R&D

Q1. All smart City Device configuration
Ans. 
Smart City Device configuration involves setting up various sensors, communication protocols, and data management systems to enable efficient city operations.
• Configure sensors for monitoring traffic flow, air quality, noise levels, etc.

• Implement communication protocols such as LoRaWAN, NB-IoT, or WiFi for data transmission.

• Set up data management systems like cloud platforms or edge computing for processing and analyzin
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Q1. Power factor correction
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Q2. Working of circuit breaker
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Circuit breakers are electrical switches designed to protect electrical circuits from damage caused by overload or short circuit.
• Circuit breakers automatically trip when they detect an overload or short circuit in the electrical system.

• They interrupt the flow of electricity to prevent damage to the circuit or electrical devices.

• Circuit breakers can be reset manually after tripping to restore power to the circuit.

• There ...read more
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