Saint-Gobain Electrical Technician Interview Questions and Answers

In series, voltage adds up while current remains the same. In parallel, voltage remains the same while current adds up.

• In series, batteries are connected end-to-end, positive to negative. In parallel, batteries are connected positive to positive and negative to negative.

• Series connection increases voltage but does not increase current. Parallel connection increases current but does not increase voltage.

• Series conn...read more

Periodic maintenance of batteries is crucial for their longevity and optimal performance.

• Check the battery terminals for corrosion and clean them if necessary

• Inspect the battery case for any cracks or damage

• Ensure that the battery is securely fastened in place

• Check the electrolyte level and top up with distilled water if required

• Test the battery voltage and recharge if necessary

A faulty battery can be identified by checking its voltage, capacity, and physical appearance.

• Check the voltage of the battery using a multimeter

• Test the capacity of the battery using a battery tester

• Inspect the physical appearance of the battery for any signs of damage or leakage

• Check the battery terminals for corrosion or loose connections

• Compare the battery's performance to its specifications

FUSE, MCB, ELCB, and RCCB are all electrical protection devices, but they differ in their functions and applications.

• FUSE is a simple device that protects electrical circuits from overloading or short-circuiting by melting and breaking the circuit.

• MCB (Miniature Circuit Breaker) is an automatic switch that trips and cuts off the power supply when there is an overload or short-circuit.

• ELCB (Earth Leakage Circuit Br...read more

R, Y, B phases are the three phases of AC power supply. They differ in their phase angle and voltage level.

• R phase has a phase angle of 0 degrees and is usually connected to the red wire.

• Y phase has a phase angle of 120 degrees and is usually connected to the yellow wire.

• B phase has a phase angle of 240 degrees and is usually connected to the blue wire.

• The voltage level of each phase is the same, but they are out ...read more

Single phase and three phase are two types of electrical power distribution systems.

• Single phase has one live conductor and one neutral conductor, while three phase has three live conductors and one neutral conductor.

• Single phase is commonly used in residential and small commercial applications, while three phase is used in industrial and large commercial applications.

• Single phase power supply is suitable for low ...read more

A DOL starter is a direct online motor starter that provides full voltage to the motor.

• Consists of a contactor, overload relay, and start/stop buttons

• The contactor connects the motor to the power supply

• The overload relay protects the motor from overloading

• The start/stop buttons control the on/off function of the motor

• Used for small motors with low starting current

• Not suitable for large motors or motors with high s...read more