Advertisements
Advertisements
प्रश्न
What is a transformer? On what principle does it work?
Advertisements
उत्तर
A transformer is device by which the amplitude of an alternating e.m.f. can be increased or decreased.
संबंधित प्रश्न
Explain the construction and working of the transformer.
Draw a labeled diagram of a step-down transformer.
State the principle of the step-down transformer and its working.
Express the turn ratio in terms of voltages.
The primary coil of an ideal step-up transformer has 100 turns and the transformation ratio is also 100. The input voltage and power are 220 V and 1100 W, respectively. Calculate the
(a) number of turns in secondary
(b) current in the primary
(c) a voltage across secondary
(d) current in secondary
(e) power in secondary
Mention the two characteristic properties of the material suitable for making core of a transformer.
Draw a labeled diagram of a full wave rectifier circuit. State its working principle. Show the input-output waveforms ?
The primary of a transformer has 40 turns and works on 100 V and 100 W. Find a number of turns in the secondary to step up the voltage to 400 V. Also calculate the current in the secondary and primary.
The 300 turn primary of a transformer has resistance 0.82 Ω and the resistance of its secondary of 1200 turns is 6.2 Ω. Find the voltage across the primary if the power output from the secondary at 1600V is 32 kW. Calculate the power losses in both coils when the transformer efficiency is 80%
Which among the following, is not a cause for power loss in a transformer?
