Senior Electrical Maintenance Technician

Senior Electrical Maintenance Technician Interview Questions and Answers

Updated 12 Dec 2024

Q1. Difference between circuit breaker and isolater?

Ans.

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

Q2. Difference between ups power and invest ?

Ans.

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

Q3. One man electric socke in 1000kv plane what u do

Ans.

I would immediately remove the electric socke to prevent any potential damage or danger.

Turn off the power source to the plane
Remove the electric socke carefully using insulated tools
Check for any damage caused by the electric socke
Repair or replace any damaged components before restoring power
Ensure proper safety measures are taken to prevent future incidents

Q4. How can 1000kv power convert to dc

Ans.

1000kv AC power can be converted to DC using a combination of transformers, rectifiers, and filters.

Step down the voltage using a transformer
Rectify the AC voltage using a rectifier
Filter the rectified voltage using a filter circuit
Examples of rectifiers include diode rectifiers, bridge rectifiers, and thyristor rectifiers
Examples of filters include capacitor filters and inductor filters

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Q5. What is power factor

Ans.

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

Power factor is the ratio of real power (kW) to apparent power (kVA) in an electrical circuit.
It indicates how efficiently power is being converted into useful work.
A power factor of 1 means all the power is being used effectively, while a power factor less than 1 indicates inefficiency.
Power factor can be improved by using power factor correction devices like capacitors.
Low power factor ...read more

Q6. Type of induction motor

Ans.

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

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Q7. function of ct

Ans.

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

Q8. function of relay

Ans.

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