10+ Electrical Shift Incharge Interview Questions and Answers

DC drive basic diagram consists of power supply, rectifier, chopper, and motor. VFD programming involves setting parameters for speed, torque, and acceleration.

• DC drive diagram includes power supply, rectifier, chopper, and motor

• VFD programming involves setting parameters for speed, torque, and acceleration

• DC drive controls motor speed and direction

• VFD can be programmed using software or keypad

• VFD parameters can be adjusted to optimize motor performance

ACBs and VCBs are circuit breakers used in substations. The type of relay used depends on the specific application.

• ACBs (Air Circuit Breakers) and VCBs (Vacuum Circuit Breakers) are used in substations to protect electrical equipment from damage due to overloads or short circuits.

• ACBs use air as the medium to extinguish the arc, while VCBs use vacuum.

• The type of relay used depends on the specific application, such as overcurrent, differential, or distance protection.

• Examples ...read more

Circuit breakers are needed in electrical systems to protect against overloads and short circuits.

• Circuit breakers help to prevent damage to electrical equipment by interrupting the flow of electricity when an overload or short circuit occurs.

• They provide a safety mechanism to quickly disconnect power in case of a fault, reducing the risk of fire or electrical hazards.

• Circuit breakers can be reset after tripping, unlike fuses which need to be replaced.

• They come in different t...read more

VFD drives are used to control the speed and torque of electric motors in various applications.

• VFD drives help in energy savings by adjusting the speed of the motor to match the load requirements.

• They provide precise control over motor speed and torque, leading to improved efficiency.

• VFD drives can also protect the motor from overloads and voltage fluctuations.

• Common applications include HVAC systems, pumps, fans, conveyors, and machine tools.

DC motor speed control parameters include armature voltage, field current, and mechanical load.

• Armature voltage: controls the speed of the motor by varying the voltage applied to the armature.

• Field current: controls the strength of the magnetic field and thus the speed of the motor.

• Mechanical load: affects the speed of the motor by changing the amount of torque required to turn the motor.

• Other factors include the type of motor, the type of load, and the control method used.

Lightning arresters are used to protect electrical equipment from damage caused by lightning strikes.

• Lightning arresters divert the high voltage of a lightning strike to the ground, preventing it from damaging the electrical system.

• They are installed at the top of buildings or structures to intercept lightning strikes before they reach the electrical equipment.

• Types of lightning arresters include rod, horn, and valve-type arresters.

• Lightning arresters are essential for protec...read more

Capacitor panels are used to store electrical energy and release it when needed to improve power factor and stabilize voltage in electrical systems.

• Capacitor panels help improve power factor by reducing reactive power in electrical systems.

• They stabilize voltage fluctuations by providing additional reactive power when needed.

• Capacitor panels are commonly used in industries with large motor loads or in commercial buildings with high power consumption.

• They can also help reduce ...read more

Generator works on the principle of electromagnetic induction to convert mechanical energy into electrical energy.

• Generators use a magnetic field and a conductor to create a flow of electrons, generating electricity.

• When the conductor moves through the magnetic field, it induces a current in the conductor.

• This current is then collected and transferred through wires to power electrical devices.

• Examples of generators include hydroelectric generators, wind turbines, and diesel g...read more

Buchholz relay is a protective device used in oil-immersed transformers to detect internal faults such as insulation breakdown or gas accumulation.

• Detects faults in transformer oil such as insulation breakdown or gas accumulation

• Triggers alarm or trips the transformer to prevent damage

• Consists of a float switch and alarm contacts

• Commonly used in large power transformers

Asset metrics, ISO, Kaizen, and 5S are all important tools for improving efficiency and productivity in the workplace.

• Asset metrics are measurements used to evaluate the performance of assets, such as equipment or machinery.

• ISO (International Organization for Standardization) is a set of standards that provide guidelines for quality management systems.

• Kaizen is a Japanese term that means continuous improvement. It involves making small, incremental changes to processes to imp...read more

Transformers are devices that transfer electrical energy between two or more circuits through electromagnetic induction.

• Step-up transformer increases voltage levels (e.g. power distribution)

• Step-down transformer decreases voltage levels (e.g. household appliances)

• Auto transformer has a single winding with multiple taps for voltage adjustment

• Isolation transformer provides electrical isolation between input and output circuits

• Distribution transformer used in power distribution ...read more

Types of motors include AC motors, DC motors, synchronous motors, and induction motors. Turbines include steam turbines, gas turbines, and wind turbines.

• AC motors: commonly used in household appliances and industrial applications

• DC motors: used in electric vehicles, robotics, and small household appliances

• Synchronous motors: used in applications requiring precise speed control

• Induction motors: widely used in industrial settings for their reliability and efficiency

• Steam turbin...read more