Electrical engineer Interview Question and Answer for Power Plant?

Interview Q & A Electrical
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Electrical Engineering Interview Question and Answer

1.Why use the vcb at high transmission system ? why cant use ACB?

Actually the thing is vacuum has high arc quenching property compare to air because in VCB,the DIE ELECTRIC strength equal to 8 times of air. That’s why always vacuum used as in HT breaker and air used as in LT.

2.What are the operations carried out in a thermal power plant?

The water is obtained in the boiler and the coal is burnt so that steam is obtained.This steam is allowed to hit the turbine,the turbine which is coupled with the generator generates the electricity.

3.What is a 2 phase motor?

A 2 phase motor is often a motor with Starting winding and running winding have a phase split.

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4.What are the types of power in electrical power ?

Three types of power are counted in electrical power a)Apparent power b)Active power c)Reactive power

  1. What is KVAR?

Kilo Volt Amperes with reactive components

6.What is the difference between MCB and MCCB?

MCB is miniature circuit breaker which is thermal operated and used for short circuit protection in small current rating circuit.

MCCB moulded case circuit breaker is thermal operated for over load current and magnetic operation for instant trip in short circuit condition.

  1. What is ACSR cable and where we use it?

ACSR means aluminium conductor steel reinforced,this conductor is used in transmission and distribution . 8.What is the difference between generator and alternator ?

Generator and Alternator are two devices,which converts mechanical energy into electrical energy, Both have the same principles of electromagnetic induction,the only difference is that their construction.Generator persist stationary magnetic field and rotating conductor which rolls on the armature with slip rings and brushes riding against each other ,hence it converts the induced emf into dc current for external load.

An alternator has a stationary armature and rotating magnetic field for high voltages but for low voltage output rotating armature and stationary magnetic field is used.