Power Plant Electrical Engineering Interview Questions Answers

Q1. What are the operations carried out in a thermal power plant?

Answer: 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.

Q2. Why use the VCB at high transmission system ? why can’t use ACB?

Answer: 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.

Q3. What are the types of power in electrical power?

Answer: Three types of power are there in electrical power
a)Apparent power
b)Active power
c)Reactive power.

Q4. What is the difference between a generator and alternator?

Answer: 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 persists 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 the external load.

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

Q5. What is ACSR cable and where we use it?

Answer: ACSR means aluminum conductor steel reinforced, this conductor is used in transmission and distribution.

Q6. What is the difference between MCB and MCCB?

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

MCCB moulded case circuit breaker is thermally operated for overload current and magnetic operation for an instant trip in short circuit condition.

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