10+ KR Mangalam Global School New Delhi Interview Questions and Answers

UPS power is a backup power supply system that provides continuous power during outages, while invest refers to putting money into a financial venture for future gain.

• UPS power stands for Uninterruptible Power Supply and is used to provide backup power during outages.

• Investing involves putting money into a financial venture with the expectation of future gain.

• UPS power is critical for maintaining power to essential equipment during power outages, while investing is a financia...read more

Circuit breakers protect circuits from overloads and short circuits, while isolators physically disconnect circuits for maintenance or repair.

• Circuit breakers automatically trip when there is an overload or short circuit to protect the circuit.

• Isolators are manually operated switches that physically disconnect a circuit for maintenance or repair.

• Circuit breakers are designed to interrupt current flow during a fault condition, while isolators are used to isolate a circuit for ...read more

Power factor is a measure of how effectively electrical power is being used in a circuit.

• Power factor is the ratio of real power (in watts) to apparent power (in volt-amperes).

• It indicates the efficiency of electrical power consumption in a circuit.

• A power factor of 1 means all the power is being used effectively, while a power factor less than 1 indicates wastage of power.

• Inductive loads like motors and transformers have a lagging power factor, while capacitive loads have a ...read more

Devices used for power factor improvement include capacitors, synchronous condensers, and static VAR compensators.

• Capacitors are commonly used to improve power factor by storing and releasing electrical energy as needed.

• Synchronous condensers are rotating machines that generate or absorb reactive power to improve power factor.

• Static VAR compensators are solid-state devices that provide reactive power compensation to improve power factor.

• Other devices such as power factor corr...read more

There are three types of induction motors: squirrel cage, wound rotor, and double squirrel cage.

• Squirrel cage induction motors are the most common type and have a simple and robust design.

• Wound rotor induction motors have external resistors connected to the rotor windings, allowing for variable speed control.

• Double squirrel cage induction motors have two sets of rotor windings, providing high starting torque and improved efficiency.

• The principle of operation for all induction...read more

CCTV cameras are used for surveillance and monitoring purposes to enhance security and safety in various settings.

• Monitoring and recording activities in real-time

• Deterring criminal activities

• Providing evidence in case of incidents

• Enhancing security in public places, homes, and businesses

Types of induction motors include single-phase, three-phase, squirrel cage, and wound rotor motors.

• Single-phase induction motors are commonly used in household appliances and small industrial applications.

• Three-phase induction motors are more efficient and are used in larger industrial applications.

• Squirrel cage induction motors have a simple and rugged construction, making them suitable for various applications.

• Wound rotor induction motors allow for external resistance to be...read more

A CT (Current Transformer) is a type of instrument transformer that is used to measure alternating electric currents.

• CTs are used to step down high currents to a lower, more manageable level for measurement or protection purposes

• They work based on the principle of electromagnetic induction

• CTs are commonly used in power distribution systems to monitor and protect electrical equipment

• They are essential for accurate metering and monitoring of current flow in electrical systems

A relay is an electrically operated switch that controls a high-power circuit with a low-power signal.

• Relays are used to control circuits by opening or closing contacts when a signal is received

• They are commonly used in industrial applications to control motors, lights, heaters, and other high-power devices

• Relays can be controlled by a variety of input signals, such as voltage, current, or even light

• Examples of relays include electromagnetic relays, solid-state relays, and re...read more

UPS power provides instant backup power during outages, while an inverter converts DC power to AC power.

• UPS power provides instant backup power during outages

• Inverter converts DC power to AC power

• UPS typically has a battery backup system for continuous power supply

• Inverter is used to power electronic devices in areas with no electricity

• UPS is commonly used for critical systems like servers and data centers

• Inverter is commonly used in homes for powering appliances during power...read more

Circuit breaker is a device that automatically interrupts an electric circuit to protect against overcurrents. Isolator is a manually operated switch used for isolating a circuit.

• Circuit breaker is an automatic device, while isolator is manually operated.

• Circuit breaker protects against overcurrents, while isolator is used for isolating a circuit.

• Circuit breaker can be reset after tripping, while isolator cannot be reset.

• Circuit breaker is commonly used in electrical distribu...read more

Preparing a Single Line Diagram (SLD) for an 11kV substation.

• Identify the components of the substation, such as transformers, circuit breakers, and switchgear.

• Determine the electrical connections and interconnections between the components.

• Represent the components and connections using standardized symbols and line diagrams.

• Include relevant information like ratings, voltages, and protective devices.

• Ensure the SLD follows industry standards and regulations.

• Review and revise th...read more

GST stands for Goods and Services Tax, a value-added tax levied on most goods and services sold for domestic consumption.

• GST is a consumption tax that is collected on the value added to goods and services at each stage of the supply chain.

• It aims to streamline the indirect tax system in India by replacing multiple taxes like VAT, service tax, etc.

• GST has multiple tax slabs ranging from 0% to 28% based on the type of goods or services.

• Input tax credit can be claimed on GST pai...read more

VCB stands for Vacuum Circuit Breaker.

• VCB is an electrical switch that uses vacuum as the arc quenching medium.

• It is used to protect electrical circuits from overloads and short circuits.

• VCBs are commonly used in medium voltage applications.

• They offer advantages such as compact size, high reliability, and low maintenance.

• Example: A VCB may be installed in a distribution panel to protect a building's electrical system.

CT stands for Current Transformer. It is used to measure and monitor electrical currents in power systems.

• CTs are used to step down high currents to a level that can be safely measured by instruments.

• They provide isolation and protection to the measuring instruments from high voltage currents.

• CTs are commonly used in electrical distribution systems, power plants, and industrial applications.

• They are essential for accurate metering, monitoring, and protection of electrical sys...read more