Sigma Electric Manufacturing Corporation Interview Questions, Process, and Tips

Technical &non technical questions

Q1. Your self Introduction
Add your answer
Q2. Technical questions Regarding your Subject
Add your answer

Q1. Quality assurance questions
Add your answer

Q1. Transformers definition
Ans. 
Transformers are electrical devices that transfer electrical energy between two or more circuits through electromagnetic induction.
• Transformers are used to step up or step down voltage levels in electrical power transmission and distribution systems.

• They consist of two or more coils of wire, known as windings, that are wound around a core made of magnetic material.

• The primary winding is connected to the input voltage s...read more
Answered by AI
View 1 more answer
Q2. Transformer is a static device which converts one ckt to another ckt without frequency change
Add your answer

Q1. Looking at Resume!
Add your answer

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
Answered by AI
View 1 more answer
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
Answered by AI
View 1 more answer
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
Answered by AI
View 1 more answer
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
Answered by AI
View 1 more answer
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
Answered by AI
View 1 more answer