Sigma Electric Manufacturing Corporation Diploma Trainee Engineer Interview Questions, Process, and Tips

There's technical aptitude test need to pass it

Q1. Hr representative asked to Introduction
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Q1. Asked about internship
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Technical &non technical questions

Q1. Your self Introduction
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Q2. Technical questions Regarding your Subject
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Q1. Quality assurance questions
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Q1. Looking at Resume!
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Q1. What voltage available in Commercial & Domestic? What is their supply voltage and frequency?
Ans. 
Commercial and domestic voltage varies depending on the country and region.
• Commercial voltage is typically higher than domestic voltage.

• In the United States, commercial voltage is usually 120/208 volts or 277/480 volts.

• In residential areas of the United States, domestic voltage is typically 120/240 volts.

• In Europe, commercial voltage is often 230/400 volts, while domestic voltage is 230 volts.

• Frequency of supply voltag...read more
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Q2. How to convert AC to DC & Drawing the Circuit Diagram?
Ans. 
AC can be converted to DC using a rectifier circuit. The circuit diagram includes a transformer, diodes, and a filter capacitor.
• AC to DC conversion is achieved using a rectifier circuit.

• A rectifier circuit consists of a transformer, diodes, and a filter capacitor.

• The transformer steps down the AC voltage to a lower level.

• Diodes are used to convert the AC voltage to pulsating DC.

• The filter capacitor smoothens the pulsat...read more
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Q3. Types of Transformers?
Ans. 
Types of transformers include power transformers, distribution transformers, autotransformers, instrument transformers, and isolation transformers.
• Power transformers are used in high voltage transmission systems to step up or step down voltage levels.

• Distribution transformers are used to supply power to residential and commercial areas.

• Autotransformers have a single winding and are used for voltage regulation.

• Instrumen...read more
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Q4. Types of Motors?
Ans. 
Types of motors include AC motors, DC motors, stepper motors, and servo motors.
• AC motors: Alternating current motors commonly used in household appliances and industrial machinery.

• DC motors: Direct current motors used in applications such as electric vehicles and robotics.

• Stepper motors: Motors that move in discrete steps and are used in printers, CNC machines, and robotics.

• Servo motors: Motors that provide precise con...read more
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Q5. Draw the DOL Starter Control & Power circuit?
Ans. 
A DOL starter control and power circuit is used to start and stop a motor directly on full line voltage.
• DOL stands for Direct-On-Line.

• The control circuit consists of a start button, stop button, and overload relay.

• The power circuit includes a contactor, motor, and power supply.

• When the start button is pressed, the contactor closes and the motor starts.

• The overload relay protects the motor from excessive current.

• The sto...read more
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Online exam conducted on basic of engineering

Q1. Personal details
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Q2. Ask about family details.
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Q3. Can you do hard work or not
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