Sigma Electric Manufacturing Corporation QA Inspector Interview Questions and Answers

Q1. Where are you living?
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Q2. Why are you leaving your last company?
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Q1. Circuit diagram of relay holding.
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A relay holding circuit diagram is used to keep the relay in the energized state even after the control signal is removed.
• The circuit typically includes a holding contact that maintains the relay coil energized.

• A latching relay can also be used for holding without continuous power supply.

• Examples: ladder logic diagram with a holding contact, latching relay circuit diagram.
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Q2. What is PNP and NPN
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PNP and NPN are types of bipolar junction transistors commonly used in electronic circuits.
• PNP transistor has a layer of N-type semiconductor between two layers of P-type semiconductor, while NPN transistor has a layer of P-type semiconductor between two layers of N-type semiconductor.

• In a PNP transistor, current flows from the emitter to the base and then to the collector, while in an NPN transistor, current flows fro...read more
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Q3. How many type of sensor?
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There are various types of sensors used for different purposes.
• Temperature sensors (e.g. thermocouples, thermistors)

• Pressure sensors (e.g. piezoelectric sensors)

• Motion sensors (e.g. accelerometers, gyroscopes)

• Proximity sensors (e.g. ultrasonic sensors)

• Light sensors (e.g. photodiodes, phototransistors)
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Q4. What is PLC and full form?
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PLC stands for Programmable Logic Controller, which is a digital computer used for automation of electromechanical processes.
• PLC is used to control machinery in manufacturing processes, such as assembly lines, robotic devices, or any activity that requires high reliability control.

• It is programmed using a specialized computer language, typically ladder logic or function block diagram.

• PLCs are commonly used in industrie...read more
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Aptitude test content core electrical maintenance questions

Q1. Tell me about yourself.
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Q2. What are your salary expectations?
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Q3. Share details of your previous job.
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Q4. Why are you looking for a change?
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Q1. Departmental discussion
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Q1. What is your family background?
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Q2. What are your salary expectations?
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Q3. Share details of your previous job.
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Q4. Where do you see yourself in 5 years?
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Q5. Tell me about yourself.
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Q6. Hi sir quality assurance department work
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Q1. Diff between water and oil pump? m, cm, mm, micron difference? Thread gauges(m8,m4,m10..etc) pitch? Types of gauges?
Ans. 
Water pumps are used to move water, while oil pumps are used to move oil. They differ in design and function.
• Water pumps are typically centrifugal pumps, while oil pumps are often positive displacement pumps.

• Water pumps are designed to handle water, while oil pumps are designed to handle oil.

• Water pumps may have impellers made of plastic or other materials that can handle water, while oil pumps may have metal impellers...read more
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Q2. What is seal leak, Body leak?
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Seal leak refers to the leakage of fluid or gas through a seal, while body leak refers to the leakage of fluid or gas through the body of a product.
• Seal leak can occur in various products such as engines, pumps, and pipelines.

• Body leak can occur in products such as tanks, containers, and pipes.

• Seal leak can be caused by wear and tear, improper installation, or manufacturing defects.

• Body leak can be caused by corrosion,...read more
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