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In order that current should flow without causing excessive heating or voltage drop, the relay contacts should have low contact resistance, be clean and smooth, be of sufficient size and proper shape.

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Answer : Overheating of relay contacts or contact born out is due to slow making and breaking of load circuit contacts, foreign matter on the contact surface, too low contact pressure.

Answer : The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to extinguish the arc.

Answer : The voltage appearing across the contacts after opening of the circuit breaker is called recovery voltage.

Description : In alternator where the voltage drop occurs?

Answer : In alternator voltage drop occurs in armature resistance, leakage reactance, and armature reactance.

Description : State the concept of internal voltage drop.

Answer : Concept of internal voltage drop: Every practical source offers some opposition to the current due to its internal parts or components. e.g. a 12V battery has electrodes made up of conducting ... internal voltage drop, the terminal voltage of practical voltage source is always less than its emf. 

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