Ambuja Neotia
TPM Consultants Interview Questions and Answers
Q1. What is Power Factor ?
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
Q2. What kind of devices we use for power factor improvement
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
Q3. Types of induction motors & their principle of operation
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
Q4. Diferrence between Circuit Breaker &Isolator
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
Q5. Prepairing a SLD for a 11kv substation
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
Q6. Full form of VCB
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.
Q7. Function of CT
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
Q8. Function of a relay
A relay is an electrical device that controls the flow of current in a circuit by using an electromagnet to open or close a switch.
Relays are commonly used in electrical systems to control high-power devices with low-power signals.
They can be used to switch on or off motors, lights, heaters, and other electrical components.
Relays provide isolation between the control circuit and the controlled circuit, protecting the control circuit from high voltages or currents.
They can be ...read more
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