10+ Electrician.I.T.I Interview Questions and Answers

There are two types of current - Alternating Current (AC) and Direct Current (DC). AC is used in domestic, industrial and many other applications, while DC is used for equipment and electric devices.

• Alternating Current (AC) flows in a back-and-forth motion and is used in most applications

• Direct Current (DC) flows in one direction and is used for specific equipment and devices

• AC is commonly used in homes, offices, and industrial settings

• DC is used in batteries, electronic devi...read more

Transformers operate on the principle of electromagnetic induction to transfer electrical energy between circuits.

• Transformers consist of primary and secondary coils wound around a magnetic core.

• They work by changing voltage levels while maintaining power (P=VI).

• Example: Step-up transformers increase voltage for long-distance transmission.

• Example: Step-down transformers reduce voltage for safe household use.

• The efficiency of transformers is typically high, often above 95%.

SMPS is a switched mode power supply used to manage and supply power to equipment as required.

• SMPS stands for Switched Mode Power Supply

• It is used to efficiently manage and supply power to electronic equipment

• It uses high frequency switching to convert AC to DC power

• It is commonly used in computers, televisions, and other electronic devices

• SMPS is more efficient and compact than traditional linear power supplies

Transformers change voltage levels in electrical circuits.

• Transformers use electromagnetic induction to transfer electrical energy from one circuit to another.

• They can step up or step down voltage levels depending on the number of windings in the primary and secondary coils.

• Transformers are used in power distribution systems to transmit electricity over long distances with minimal loss.

• They are also used in electronic devices to convert AC voltage to DC voltage.

• Transformers c...read more

Transformers are electrical devices that change voltage levels in AC circuits, enabling efficient power distribution.

• Transformers operate on the principle of electromagnetic induction.

• They consist of primary and secondary coils wound around a magnetic core.

• Step-up transformers increase voltage, while step-down transformers decrease it.

• Example: A step-up transformer is used in power plants to transmit electricity over long distances.

• Transformers are essential in various applic...read more

AC (Alternating Current) and DC (Direct Current) are two types of electrical current used in various applications.

• AC changes direction periodically, while DC flows in one direction.

• AC is commonly used in homes for powering appliances (e.g., refrigerators).

• DC is used in batteries and electronic devices (e.g., smartphones).

• AC is generated by power plants, while DC can be produced by batteries or solar panels.

• AC is typically transmitted over long distances due to lower energy lo...read more

The main safety equipment used for transformers are fuses, circuit breakers, and protective relays.

• Fuses are used to protect the transformer from overcurrents.

• Circuit breakers are used to protect the transformer from short circuits.

• Protective relays are used to detect abnormal conditions and trip the circuit breaker.

• Other safety equipment may include grounding devices and temperature sensors.

S.W.G stands for Standard Wire Gauge, a system for measuring wire diameter in electrical applications.

• S.W.G is a standardized system used to specify wire sizes.

• The gauge number inversely relates to the wire diameter; a higher gauge means a thinner wire.

• For example, 10 S.W.G wire has a diameter of approximately 2.59 mm.

• S.W.G is commonly used in electrical wiring, where specific wire sizes are crucial for safety and performance.

• Different countries may have variations in S.W.G s...read more

AC stands for alternating current while DC stands for direct current. The main difference is the direction of flow of electrons.

• AC changes direction periodically while DC flows in one direction only

• AC is used for power transmission over long distances while DC is used for electronic devices

• AC voltage can be easily changed using transformers while DC voltage cannot be changed easily

• Examples of AC sources include generators and power grids while examples of DC sources include b...read more

AC motor is an electric motor that operates on alternating current, widely used in various applications for its efficiency and reliability.

• AC motors convert electrical energy into mechanical energy using alternating current.

• They are commonly used in industrial applications, such as conveyor belts and pumps.

• Types of AC motors include synchronous and asynchronous (induction) motors.

• Synchronous motors maintain a constant speed, while induction motors vary speed based on load.

• Exa...read more

CT and PT are electrical devices used for measuring current and voltage respectively.

• CT stands for Current Transformer and is used to measure high currents in power systems.

• PT stands for Potential Transformer and is used to measure high voltages in power systems.

• CT and PT are commonly used in metering and protection systems in electrical power networks.

• CT and PT are also used in testing and commissioning of electrical equipment.

• CT and PT are designed to step down high current...read more

Capacitor testing involves measuring capacitance, checking for shorts, and assessing leakage to ensure proper functionality.

• Use a multimeter set to capacitance mode to measure the capacitor's value.

• Check for shorts by measuring resistance across the terminals; a low reading indicates a short.

• Perform a leakage test by applying a voltage and observing if the capacitor holds charge without significant drop.

• Example: A 100µF capacitor should read close to 100µF on the multimeter.