Advertisements
Advertisements
प्रश्न
Transformer works on ______.
विकल्प
AC only
DC only
Both AC and DC
Advertisements
उत्तर
Transformer works on AC only
APPEARS IN
संबंधित प्रश्न
State the underlying principle of a transformer. How is the large scale transmission of electric energy over long distances done with the use of transformers?
In an ideal transformer, an output of 66 kV is required when an input voltage of 220 V is available. If the primary has 300 turns, how many turns should the secondary have?
Why is the core of a transformer made of soft iron?
A transformer lowers e.m.f. 220 V to 12 volts. If the number of turns in primary are 8800, how many turns are 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.
Give the advantage of AC in long distance power transmission with an illustration.
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.
We need to step-up the voltage for power transmission, so that ______.
An iron rod is placed parallel to magnetic field of intensity 2000 Am-1. The magnetic flux through the rod is 6 × 10−4 Wb and its cross-sectional area is 3 cm2. The magnetic permeability of the rod in Wb A-1m-1 is ______.
The primary coil of a transformer has 60 turns whereas its secondary coil has 3000 turns.
If a 220 V ac voltage is applied to the primary coil, how much emf is induced in the secondary coil?
When is an emf induced in the neighbouring coil?
