The amount of inrush current in the primary of a transformer is limited by the........, A- amount of applied voltage, B- resistance of the wire in the primary winding, C- flux change of the magnetic field in the core, D - all of the above What precaution must be observed when working whit current transformers? A- never have a load on the secondary, B- always ha a load on the secondary, C- de-energize the primary whenever there is a load on the secondary, D - none The fact that the movable coil of a constant-current transformer moves further away from the stationary coil with a increase in load current is based on which fundamental priciple of magnetism? A- like magnetic poles attract, B- like magnetic poles repel, C- the amount of current flowing through a coil inverdely proportional to its flux density. D- non

2. A single-phase, 50-Hz, core-type transformer's no-load voltage ratio is 1,200/440. If the maximum flux is 0.075 Wb, determine the number of turns in each winding. 3. The low-voltage winding of a 3000/200-V, 50-Hz, a single-phase transformer has 80 turns and is installed on a core with an efficient cross-sectional area of 150 cm2. Make a calculation on: a. the high-voltage winding's number of turns b. the value of the maximum flux density in the core 4. When supplied at 230 V, 50 Hz, a transformer's no-load current is 5.0 A at 0.3 power factor. The primary winding has a total of 200 tums. Calculate the (i) maximum value of flux in the core, (ii) core loss, and (i) magnetizing current. 5. A 1-phase transformer has 500 primary and 1200 secondary turns. The net cross-sectional area of the core is 75 cm2. If the primary winding be connected to a 400-V, 50 Hz supply, calculate. (i) the peak value of flux density in the core and (i) voltage induced in the secondary winding.

Due to the increase in load, what change you saw in the transformer’s output power and voltage regulation?

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In a transformer that has 10 times more turns on the secondary side (side 2) than on the primary side (side 1), the magnitude of the voltage/EMF across the windings on the secondary side, E₂ will be... O a.... 10 times lower than the voltage/emf on the primary side, E₁. O b.... the same as the voltage/emf on the primary side. O c.... always zero regardless of the voltage on the primary side, E₁. O d.... 10 times higher than the voltage/emf on the primary side, E₁.

A 10-kVA, 1-phase transformer has a turn ratio of 300/23. The primary is connected to a 1500-V,               60 Hz supply. Find the secondary volts on open-circuit and the approximate values of the currents in the two windings on full-load. Find also the maximum value of the flux.