MARS Construction Electrical Engineer Interview Questions and Answers

Q1. Self introduction
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Q2. Previous experience and languages
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Q1. What about synchronous motor principal
Ans. 
Synchronous motors operate at a constant speed determined by the frequency of the power source.
• Synchronous motors have a rotor that rotates at the same speed as the rotating magnetic field in the stator.

• They are used in applications where constant speed is required, such as in industrial processes or power generation.

• Synchronous motors are more efficient than induction motors at higher loads.

• They require a separate DC ...read more
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Q2. Difference between induction and synchronous motor
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Induction motors rely on induction to produce torque, while synchronous motors require a magnetic field to rotate at a constant speed.
• Induction motors do not require any external connections to the rotor, while synchronous motors need a DC power source to create the magnetic field.

• Induction motors are self-starting, while synchronous motors require external means to start.

• Induction motors are more commonly used in indu...read more
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Q1. What do you know about PCB ?
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PCB stands for Printed Circuit Board, a board made of non-conductive material with conductive tracks for electronic components.
• PCB is used to mechanically support and electrically connect electronic components using conductive pathways.

• It is made of non-conductive material like fiberglass, with copper tracks to connect components.

• PCBs can be single-sided, double-sided, or multi-layered depending on the complexity of th...read more
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Q2. What is the active and passive components?
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Active components require a power source to operate, while passive components do not.
• Active components require an external power source to function, such as transistors and integrated circuits.

• Passive components do not require an external power source, such as resistors and capacitors.

• Active components can control the flow of electricity, while passive components simply store or dissipate energy.

• Examples of active comp...read more
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Q3. What is the difference between resistance and capacitor?
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Resistance is the opposition to the flow of current in a circuit, while a capacitor stores and releases electrical energy.
• Resistance limits the flow of current, while a capacitor stores and releases charge.

• Resistance is measured in ohms, while capacitance is measured in farads.

• Examples of resistors include carbon film resistors, while examples of capacitors include ceramic capacitors.

• Resistance dissipates energy in the...read more
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Q4. What do you know about SMT ?
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SMT stands for Surface Mount Technology, a method of electronic component assembly where components are mounted directly onto the surface of a printed circuit board (PCB).
• SMT components are smaller and lighter than through-hole components, allowing for higher component density on PCBs.

• SMT components are typically mounted using solder paste and reflow soldering techniques.

• SMT technology allows for automated assembly pro...read more
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C6h12o6 what's this is

Q1. Root 3 what is this
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Q2. 66 conversation for Roman number
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Q1. Auxin what is theis
Ans. 
Auxin is a plant hormone that regulates growth and development.
• Auxin is responsible for cell elongation and division in plants.

• It plays a role in phototropism, gravitropism, and apical dominance.

• Examples of auxin include indole-3-acetic acid (IAA) and synthetic auxins like 2,4-D.
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Q2. Iaa what is this
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Q1. Errection of 11 kv line and detail about material in 1 km line?
Ans. 
The erection of an 11 kV line involves setting up a power line infrastructure for transmitting electricity over a distance of 1 km.
• Materials required include conductors (such as aluminum or copper), insulators, poles, transformers, and hardware fittings.

• The conductors are used to carry the electricity from one point to another, while insulators prevent the flow of electricity to the ground.

• Poles are used to support the...read more
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Q1. Privious salay?
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Q1. What is moter and it capacity
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A motor is a device that converts electrical energy into mechanical energy to perform work.
• Motors are commonly used in various applications such as electric vehicles, industrial machinery, and household appliances.

• They come in different types such as AC motors, DC motors, and stepper motors.

• Motor capacity refers to its power rating, typically measured in horsepower (HP) or kilowatts (kW).

• Higher capacity motors can gene...read more
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Q2. Moter is a mechanical part which convert electrical energy in to mechanical energy
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Q1. Regarding to my previous job
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Q2. Regarding LT panel and HT panel, motors and maintenance.
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Q1. Technical questions
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Q1. What is Full form DOL starter
Ans. 
DOL starter stands for Direct-On-Line starter, used to start motors by directly connecting them to the power supply.
• DOL starter is the simplest and most common type of motor starter.

• It directly connects the motor to the power supply without any intermediate starting method.

• It provides full voltage to the motor during starting, which can cause high inrush current.

• DOL starters are suitable for small to medium-sized motor...read more
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Q2. What is APFC PANEL
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APFC PANEL stands for Automatic Power Factor Correction Panel, used to maintain power factor in electrical systems.
• APFC PANEL automatically monitors and corrects the power factor of electrical systems.

• It helps in reducing electricity bills by maintaining a high power factor.

• APFC PANELs are commonly used in industries and commercial buildings.

• They consist of capacitors that are switched on and off based on the load requ...read more
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Q3. Star dalta conection
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Q1. As per company policy requirement condition
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Q1. As per company policy requirement
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