Sigma Electric Manufacturing Corporation
Floraison Strategic Consulting Interview Questions and Answers
Q1. How to convert AC to DC & Drawing the Circuit Diagram?
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 pulsating DC to obtain a steady DC output.
The circuit diagram ca...read more
Q2. What voltage available in Commercial & Domestic? What is their supply voltage and frequency?
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 voltage is usually 50 or 60 Hz, depending on the country.
Q3. What is casting?
Casting is a manufacturing process in which a liquid material is poured into a mold and allowed to solidify.
Casting is used to create complex shapes that would be difficult or impossible to make using other methods.
The material used for casting can be metal, plastic, or even concrete.
The mold can be made of various materials such as sand, plaster, or ceramic.
Casting is used in various industries such as automotive, aerospace, and construction.
Examples of cast products include...read more
Q4. Draw the DOL Starter Control & Power circuit?
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 stop button opens the contactor and stops the motor.
Q5. Advantage and disadvantages of die casting?
Die casting has advantages like high production rate and dimensional accuracy, but it also has disadvantages like high initial cost and limited material options.
Advantages of die casting:
- High production rate: Die casting allows for fast and efficient production of complex shapes with high precision.
- Dimensional accuracy: The die casting process ensures consistent and precise dimensions, resulting in parts that fit together perfectly.
- Smooth surface finish: Die cast parts ...read more
Q6. Last count of vernier calipers?
The last count of vernier calipers depends on the specific model and brand.
The last count of vernier calipers can range from 0.01mm to 0.05mm.
Different brands and models have different last counts.
The last count is the smallest measurement that can be read on the vernier scale.
Examples of last counts include 0.02mm, 0.03mm, and 0.05mm.
It is important to know the last count when using a vernier caliper for precise measurements.
Q7. Type of casting ?
Casting is a manufacturing process in which a liquid material is poured into a mold and allowed to solidify.
Casting is used to produce complex-shaped parts that are difficult to make by other methods.
There are different types of casting processes such as sand casting, investment casting, die casting, and more.
Sand casting is the most widely used casting process, where a mold is made from sand and molten metal is poured into it.
Investment casting, also known as lost-wax castin...read more
Q8. Types of Transformers?
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.
Instrument transformers are used to measure current and voltage in ...read more
Q9. Types of Motors?
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 control of angular or linear position and are used in robotic...read more
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