is reduced

is increased

remains the same

none of these

is one

are two

are three

are numerous

primary to secondary

secondary to primary

primary to secondary and from secondary to primary

none of these

copper-loss remains low

eddy-current-loss remains low

hysteresis-loss remains low

both copper and eddy-current losses remain low

it works on the principle of mutual induction

it is a static instrument

its windings remain immersed in the mineral oil

there is no loss of electric power in it