1) Transformer transforms
a) frequency
b) voltage
c) current
d) current and voltage
a) frequency
b) voltage
c) current
d) current and voltage
2) The main purpose of using core in a transformer is to
a) decrease iron losses
b) prevent eddy current loss
c) eliminate magnetic hysteresis
d) decrease reluctance of the conman magnetic circuit
3) A step up transformer increases
a) voltage
b) current
c) power
d) frequency
4) Ideal transformer
a) wingdings have no resistance
b) core has no losses
c) core has infinite permeability
d) all of the above
5) Transformer core are laminated in order to
a) simplify it's construction
b) minimize eddy current loss
c) reduce cost
d) reduce hysteresis loss
6) Which part of the transformer is subjected to maximum heating.
a) core
b) winding
c) oil
d) tank
7) The core of a transformer is made up of
a) silicon steel
b) carbon steel
c) copper
d) aluminium
8) The noise in a transformer is due to
a) higher flux density in the core
b) higher primary voltage
c) magneto strction
d) eddy current losses
9) The chemical used in the breather is
a) carbon tetra-chloride
b) silica sand
c) silica gel
d) sodium chloride
10) Power transformers are designed to have efficiency at
a) 50% full load
b) near full load
c) 90% full load
d) no-load
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