Advertisements
Advertisements
प्रश्न
Mention the two characteristic properties of the material suitable for making core of a transformer.
Advertisements
उत्तर
Since due to iron core we have two types of losses,
1. Iron lossi.e. energy loss in the form of heat due to the induced eddy current that can be minimized by using thin laminated core.
2. Hysteresis loss due to alternately passing a current in the coil to magnetize and demagnetize the iron core. This can be reduced by using a special alloy of iron core with silicon.
So material with less iron loss and less hysteresis loss is used for making core of transformer.
संबंधित प्रश्न
The transformer is used in ______ current circuits.
In a transformer, the frequency of A.C. voltage ______.
Draw a labeled diagram of a full wave rectifier circuit. State its working principle. Show the input-output waveforms ?
A transformer lowers e.m.f. from 220 V to 15 V. If 400 W power is given in primary, calculate (i) the current in primary coil and (ii) the current in secondary coil.
State the mathematical relation between a number of turns in the primary coil to a secondary coil in the step-up transformer.
Describe the construction and working of a transformer with a neat labelled diagram.
Read the following paragraph and answer the question:
Long distance power transmissions
The large-scale transmission and distribution of electrical energy over long distances is done with the use of transformers. The voltage output of the generator is stepped up. It is then transmitted over long distances to an area sub-station near the consumers. There the voltage is stepped down. It is further stepped down at distributing sub-stations and utility poles before a power supply of 240 V reaches our homes.
If the secondary coil has a greater number of turns than the primary, ______.
How do the input and output powers in a transformer compare? State the assumption made.
In an ideal transformer, the turns ratio is \[\frac {N_p}{N_s}\] = \[\frac {1}{2}\]. The ratio Vs : Vp is equal to (the symbols carry their usual meaning) ______.
