Transformer
Trending Questions
Q. The percentage error in the measurement of thevoltage V is 3% and in the measurement of thecurrent is 2%. The percentage error in themeasurement of the resistance is(2) 2%(1) 3%(3) 1%(4) 5%
Q. Find the power if the work done is given
W=6t²+2
Q. A step down transformer is used to reduce the main supply of 220 V to 10 V. If the primary draws 5 A and secondary draws 88 A current, calculate the efficiency of the transformer.
- 60%
- 70%
- 80%
- 90%
Q.
The turn ratio of a transformers is given as 2 : 3. If the current through the primary coil is 3 A, thus calculate the current through load resistance
1 A
4.5 A
2 A
1. 5 A
Q. A voltage of 10 V and frequency 1000 Hz is applied to 1/pie microFaraday capacitor in series with a resistor of 500 ohm . Find the power factor of the circuit and the power dissipated.
Q. A 220 V input is supplied to a transformer. The output circuit draws a current of 2.0 A at 440 V. If the efficiency of the transformer is 80%, the current drawn by the primary windings of the transformer is
- 1 A
- 1.25 A
- 2.5 A
- 5 A
Q. An electric bulb having small resistance and a capacitor are joined in series with an AC source whose frequency can be varied. On increasing the frequency of AC source, the glow of the bulb
- decreases.
- increases.
- The bulb will not glow at all.
- remains unchanged.