Identify the power system component represented by the given symbol. O potential transformer O ircuit breaker O Lightning arrester O current transformer

Voltage control method connected across the load, to supply part of VAR required is ..... O Shunt capacitor O tap changing transformer O series capacitor O booster transformer

Transferred surge current method is used to find a. Fault in the transformer insulation b. Fault in the Circuit breaker c. Fault in the cables d. Fault in the lines

Two transformers A and B have the following data Transformer A: 6600/440 V, (250 KVA ) requires ( 6%) of rated voltage to circulate (90%) of full load current at power factor (0.25) when the low voltage winding is short circuited and the no load loss is equal to (2500 W). Transformer B: 6600/420 V, (600 KVA) requires (9%) of rated voltage to circulate (80%) of full load current at power factor (0.16) when low voltage winding is short circuited and no load loss is equal to (4500 W). Calculate the followings: If both transformers are connected in parallel to supply a load (1.2 + j 2.3) ohm, find the output power of each transformer.

If a transformer is to be taken out for maintenance, as an engineer, outline the switching sequence and give your reasons

27   What way the two electrical circuits are linked in transformer to change the values of alternating voltages and currents? a. Ferromagnetic core b. Secondary Winding c. Mutual induction  d. Primary Winding

What is the reason of humming sound in transformer?

Power engineering book Mehta

Which of the following are power losses that can occur in a practical transformer (non-ideal)? copper loss O loss due to eddy currents V hysteresis loss O voltage drop due to coil material

(9) The hysteresis losses in electrical machines reduced. a- By core lamination. b- By core isolation. c- By choosing another type of iron. (10) The eddy current losses in electrical machines reduced. d- By core lamination. e- By core isolation. f- By choosing another type of iron.