Interview questions with answers - 2

Technical interview question: why we do 2 types of earthing on tranformer ie:body earthing & nutral earthing , what is function. i am going to instal a 5oo kva tranformer & 380 kva DG set what should the earthing value?

Answer:The two types of earthing are Familiar as Equipment earthing and Sysytem earthing.In Equipment earthing: body ( non conducting part)of the eqipment shold be earthed to safegaurd the human beings.system Earthing : In this neutral of the supply source ( Transformer or Generator) should be grounded. With this,in case of unbalanced loading neutral will not be shifted.so that unbalanced voltages will not arise. We can protect the equipment also. With size of the equipment( transformer or alternator)and selection of relying system earthing will be further classified into directly earthed,Impedance earthing, resistive (NGRs) earthing.

Technical interview question:What is the difference between MCB & MCCB, Where it can be used?

Answer:MCB is miniature circuit breaker which is thermal oprated and use for short circuit protection in small current rating circuit. MCCB moulded case circuit breaker and is thermal operated for over load current and magnetic operation for instant trip in short circuit condition.under voltage and under frequency may be inbuilt. Normally it is used where normal current is more than 100A.

Technical interview question:Where should the lighting arrestor be placed in distribution lines?

Answer:Near distribution transformers and out going feeders of 11kv and incomming feeder of 33kv and near power transformers in sub-stations.

Technical interview question:Define IDMT relay?

Answer:It is an inverse definite minumum time relay.In IDMT relay its operating is inversely proportional and also a characteristic of minumum time after which this relayoperates.It is inverse in the sense ,the tripping time will decrease as the magnitude of fault current increase.

Technical interview question:What are the transformer losses?

Answer:TRANSFORMER LOSSES - Transformer losses have two sources-copper loss and magnetic loss. Copper losses are caused by the resistance of the wire (I2R). Magnetic losses are caused by eddy currents and hysteresis in the core. Copper loss is a constant after the coil has been wound and therefore a measureable loss. Hysteresis loss is constant for a particular voltage and current. Eddy-current loss, however, is different for each frequency passed through the transformer.