Senior Electrical Technician
70+ Senior Electrical Technician Interview Questions and Answers

Asked in Sraco

Q. Which fire extinguisher should be used for electrical fires?
The appropriate fire extinguisher to use in an electrical fire is a Class C fire extinguisher.
Class C fire extinguishers are specifically designed to extinguish fires involving electrical equipment.
They contain non-conductive extinguishing agents, such as carbon dioxide or dry chemical powder, to safely put out the fire without conducting electricity.
It is important to never use water or foam-based extinguishers on electrical fires as they can conduct electricity and potentia...read more

Asked in Epiroc

Q. What is the function of the hydraulic pump in a hydraulic circuit?
The hydraulic pump is responsible for generating the flow of hydraulic fluid in a hydraulic circuit.
The hydraulic pump converts mechanical energy into hydraulic energy.
It creates the pressure needed to move the hydraulic fluid through the circuit.
The pump provides the force necessary to operate hydraulic actuators, such as cylinders or motors.
It ensures the proper functioning of the hydraulic system by maintaining a consistent flow of fluid.
Examples of hydraulic pumps include...read more
Senior Electrical Technician Interview Questions and Answers for Freshers

Asked in Infosys

Q. What is a generator?
A generator is a device that converts mechanical energy into electrical energy.
Generators are commonly used to provide backup power during electrical outages.
They work on the principle of electromagnetic induction.
Generators can be powered by various sources such as gasoline, diesel, natural gas, or renewable energy.
They are used in various applications including residential, commercial, and industrial sectors.
Examples of generators include portable generators, standby genera...read more

Asked in Efs Facilities Services

Q. What is the battery voltage during discharge?
The battery voltage decreases during discharge.
Battery voltage decreases as the battery discharges.
The rate of voltage decrease depends on the battery's capacity and load.
For example, a fully charged 12V battery may drop to 11V after discharging for a certain period.
Battery voltage can be measured using a voltmeter.

Asked in Efs Facilities Services

Q. How do you connect capacitors in a capacitor bank?
Capacitors in a capacitor bank are connected in parallel to increase the overall capacitance.
Capacitors in a capacitor bank are connected in parallel.
The positive terminals of all the capacitors are connected together, and the negative terminals are connected together.
This parallel connection increases the overall capacitance of the bank.
For example, if three capacitors with capacitances of 10μF, 20μF, and 30μF are connected in parallel, the total capacitance of the bank woul...read more

Asked in Updater Services

Q. How do you manage a power failure situation?
In a power failure situation, it is important to have a plan in place to manage the situation effectively.
Ensure backup power sources are available, such as generators or uninterruptible power supplies (UPS)
Implement a power outage response plan that includes procedures for safely shutting down equipment and systems
Regularly test backup power systems to ensure they are in working order
Have emergency lighting and communication systems in place
Train staff on power failure proto...read more
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Asked in Updater Services

Q. What is the battery voltage during charging?
The battery voltage during charging time depends on the charging method and the type of battery.
The battery voltage can vary depending on the charging method used.
For example, in a constant voltage charging method, the battery voltage remains constant during charging.
In a constant current charging method, the battery voltage gradually increases as the battery charges.
The battery voltage also depends on the type of battery being charged, such as lead-acid, lithium-ion, or nick...read more

Asked in Efs Facilities Services

Q. How do you manage overloads?
To manage overloads, ensure proper circuit design, use protective devices, monitor load levels, and implement load shedding.
Design circuits with appropriate capacity to handle expected loads.
Install protective devices like circuit breakers and fuses to prevent overloads.
Regularly monitor load levels using ammeters or power monitoring systems.
Implement load shedding techniques to prioritize critical loads during high demand.
Consider using power factor correction techniques to ...read more
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Asked in Efs Facilities Services

Q. How do you connect a UPS battery?
To connect a battery in a UPS, follow these steps:
Identify the positive and negative terminals of the battery
Connect the positive terminal of the battery to the positive terminal of the UPS
Connect the negative terminal of the battery to the negative terminal of the UPS
Ensure the connections are secure and tight
Verify the battery voltage and capacity compatibility with the UPS
Consider using appropriate cables and connectors for the connection

Asked in Viatris

Q. Responsible for carryout condition monitoring, LLF and thermography on scheduled interval. Responsible for carry out Preventive, Predictive and Breakdown maintenance of electrical equipment. Good knowledge of t...
read moreI am responsible for carrying out condition monitoring, maintenance, and troubleshooting of electrical equipment.
Perform scheduled condition monitoring, LLF, and thermography
Conduct preventive, predictive, and breakdown maintenance of electrical equipment
Possess good knowledge of troubleshooting electrical circuits
Adept at reading and modifying control schematic diagrams
Ensure smooth operations of electrical equipment

Asked in Efs Facilities Services

Q. What is the earth's ohm resistance?
The earth ohm resistance refers to the resistance of the earth or ground in an electrical circuit.
Earth ohm resistance is a measure of how easily current can flow through the earth.
It is important to have a low earth ohm resistance to ensure proper grounding and safety in electrical systems.
The earth ohm resistance can vary depending on factors such as soil composition, moisture content, and temperature.
Typically, a good earth ohm resistance value is below 5 ohms.
Earth ohm re...read more

Asked in Epiroc

Q. What is the function of a capacitor in an electrical circuit?
A capacitor stores electrical energy and releases it when needed.
Capacitors are used to filter out noise and stabilize voltage in power supplies.
They are also used in timing circuits, oscillators, and filters.
Capacitors can be polarized or non-polarized, and have different capacitance values.
They are commonly found in electronic devices such as TVs, radios, and computers.

Asked in Epiroc

Q. What is the standard voltage used in Zambia?
The standard voltage used in Zambia for boomers is 400 volts.
The standard voltage for boomers in Zambia is 400 volts.
This voltage is commonly used for electrical equipment and machinery.
It is important to ensure that boomers are compatible with this voltage before use.

Asked in Exicom Tele Systems

Q. What is a rectifier?
A rectifier is an electrical device that converts alternating current (AC) to direct current (DC).
Rectifiers are commonly used in power supplies to convert AC voltage to DC voltage.
They are made up of diodes, which allow current to flow in only one direction.
Rectifiers can be half-wave or full-wave, depending on the number of diodes used.
Examples of rectifiers include bridge rectifiers, vacuum tube rectifiers, and solid-state rectifiers.

Asked in Tata Power Solar

Q. What are the protection methods used for transformers?
Protection methods for transformers include overcurrent protection, differential protection, and temperature monitoring.
Overcurrent protection: Uses fuses or circuit breakers to protect against excessive current flow.
Differential protection: Compares the current entering and leaving the transformer to detect internal faults.
Temperature monitoring: Uses sensors to monitor the temperature of the transformer and trigger alarms or shutdowns if it exceeds safe levels.


Q. What is the unit of electrical current?
Electrical current unit is measured in Amperes (A).
Electrical current unit is the measure of the flow of electric charge.
It is measured in Amperes (A) and is named after the French physicist Andre-Marie Ampere.
One Ampere is defined as the amount of current that flows when one Coulomb of charge passes through a conductor in one second.
Electrical current is the rate at which electric charge flows through a circuit.
It is an essential concept in electrical engineering and is used...read more

Asked in Om Industries

Q. For a 30 KW load, what size cable (in square mm) is required?
The cable required for a 30 KW load depends on the voltage and current rating.
The cable size is determined by the current carrying capacity and voltage drop requirements.
The current carrying capacity of a cable depends on its cross-sectional area.
The voltage drop should be within acceptable limits to ensure proper functioning of the load.
Factors like cable material, installation method, and ambient temperature also affect cable selection.
Consulting relevant standards and guid...read more

Asked in Efs Facilities Services

Q. Which meter is used in an earth test?
A digital multimeter (DMM) is commonly used for earth testing.
A digital multimeter (DMM) is a versatile tool that can measure resistance, voltage, and current.
For earth testing, the DMM is used to measure the resistance between the earth electrode and the grounding system.
The DMM should be set to the resistance (ohms) mode and connected to the earth electrode and grounding system.
The measured resistance value helps determine the effectiveness of the grounding system.
Other spe...read more


Q. 3.AHU full form & AHU where is it used?
AHU stands for Air Handling Unit. It is used in HVAC systems to regulate and circulate air in buildings.
AHU stands for Air Handling Unit.
It is a device used in HVAC (Heating, Ventilation, and Air Conditioning) systems.
AHUs are responsible for regulating and circulating air in buildings.
They help maintain indoor air quality and temperature.
AHUs are commonly found in commercial buildings, hospitals, schools, and industrial facilities.
They can be used in both new construction an...read more

Asked in JK Cement

Q. How many types of motor? Ans: Motor 2 types.Ac motor&Dc motor..
There are two types of motors: AC motors and DC motors.
AC motors are powered by alternating current and are commonly used in household appliances and industrial machinery.
DC motors are powered by direct current and are often found in battery-operated devices and electric vehicles.


Q. What is an SF6 breaker?
SF⁶ breaker is a type of circuit breaker that uses sulfur hexafluoride gas as the medium for extinguishing the arc.
SF⁶ breaker is commonly used in high-voltage electrical systems.
It is known for its excellent insulating properties and high dielectric strength.
The sulfur hexafluoride gas in the breaker acts as an effective cooling and arc-quenching medium.
SF⁶ breaker is often used in power transmission and distribution systems, as well as in industrial settings.
It is designed ...read more

Asked in JK Cement

Q. What is the CT? Ans: CT is a Current Transformer...it is measure flow of current.
A CT is a Current Transformer used to measure the flow of current.
CT stands for Current Transformer.
It is a device used to step down high currents to a safe level for measurement or protection purposes.
CTs are commonly used in electrical power systems to monitor and control current flow.
They consist of a primary winding and a secondary winding, where the primary winding is connected in series with the current being measured.
The secondary winding produces a proportional curren...read more


Q. What types of transformers are you familiar with?
There are various types of transformers such as power transformers, distribution transformers, autotransformers, isolation transformers, etc.
Power transformers are used in high voltage transmission systems.
Distribution transformers are used to step down the voltage for distribution to homes and businesses.
Autotransformers have a single winding and are used for voltage regulation.
Isolation transformers are used to isolate a circuit from the power source.
Other types include ins...read more

Asked in Q Tech Microelectronics India

Q. What are the seven quality tools used in industrial settings?
The seven quality tools used in industrial settings are essential for process improvement and problem-solving.
Check sheets: Used to collect and analyze data in a systematic way.
Cause-and-effect diagrams (Fishbone diagrams): Used to identify and analyze potential causes of a problem.
Control charts: Used to monitor process variation over time.
Histograms: Used to show the frequency distribution of a set of data.
Pareto charts: Used to prioritize problems or causes based on their ...read more

Asked in Tata Power Solar

Q. How do you perform the IV curve testing of a solar module?
IV curve testing of solar modules involves measuring the current-voltage characteristics to assess performance.
IV curve testing helps determine the power output of a solar module under different conditions.
The test involves varying the voltage across the module while measuring the current flowing through it.
The resulting IV curve provides valuable information on the module's efficiency and performance.
By analyzing the IV curve, technicians can identify any issues or defects i...read more

Asked in Tata Power Solar

Q. What is the process of module installation?
The process of module installation involves planning, preparation, installation, testing, and commissioning.
Plan the layout and placement of modules based on specifications and requirements
Prepare the site by ensuring proper electrical connections and safety measures
Install the modules following manufacturer's instructions and industry standards
Test the modules to ensure they are functioning correctly
Commission the modules to integrate them into the larger electrical system
Ex...read more

Asked in Maaden

Q. Explain the maintenance procedures for motors, transformers, VSDs, and panels.
Regular maintenance of motors, transformers, VSDs, and panels is crucial for their optimal performance and longevity.
Inspect and clean motors and transformers regularly to prevent dust buildup and overheating
Check VSDs for any signs of wear and tear, and replace faulty components as needed
Perform routine inspections of panels to ensure proper wiring and connections
Keep a record of maintenance activities and schedule regular maintenance intervals
Train personnel on proper maint...read more

Asked in Shree Cement

Q. Do you maintain HT and LT motors and troubleshoot issues?
Yes, I have experience in maintaining HT motors and troubleshooting issues.
Yes, I have experience in maintaining HT motors and troubleshooting any issues that may arise.
I am familiar with conducting regular maintenance checks on HT motors to ensure they are functioning properly.
I have the skills to diagnose and repair any problems that may occur with HT motors, such as overheating or electrical issues.

Asked in Shree Cement

Q. What is the working principle of an HT capacitor?
HT capacitor nct working principle involves storing electrical energy in an electric field.
HT capacitors store electrical energy in an electric field
They are used in high voltage applications to improve power factor and reduce reactive power
The working principle involves charging and discharging of the capacitor to regulate voltage levels

Asked in JK Cement

Q. How many types of Electricity ? Electricity 2 types 1:statics&2:Dynamic..
There are two types of electricity: static electricity and dynamic electricity.
Static electricity is the buildup of electric charge on an object without any flow of electric current.
Dynamic electricity is the flow of electric charge through a conductor.
Examples of static electricity include rubbing a balloon on hair and getting shocked by touching a doorknob.
Examples of dynamic electricity include the electricity flowing through wires in our homes and powering electronic devi...read more
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