Shree Hari Infraprojects Electrician Interview Questions and Answers

The SI unit of resistance is ohm (Ω).

• The SI unit of resistance is named after the German physicist Georg Simon Ohm.

• Resistance is the measure of opposition to the flow of electric current.

• Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage applied and inversely proportional to the resistance.

• The symbol for ohm is the Greek letter omega (Ω).

Line voltage is higher than phase voltage in three-phase power systems.

• Line voltage is the voltage between any two phases in a three-phase power system.

• Phase voltage is the voltage between any one phase and the neutral point.

• In a balanced three-phase system, line voltage is √3 times higher than phase voltage.

• For example, if the phase voltage is 120V, the line voltage would be 208V.

• The phase voltage is used to rate the ...read more

MCB - Miniature Circuit Breaker, ELCB - Earth Leakage Circuit Breaker, RCCB - Residual Current Circuit Breaker, MCCB - Molded Case Circuit Breaker, ACB - Air Circuit Breaker

• MCB: Protects electrical circuits from overcurrents and short circuits

• ELCB: Detects and protects against leakage current to prevent electric shock

• RCCB: Provides protection against residual current and earth faults

• MCCB: Offers protection against over...read more