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What will increase in step-down transfor...

What will increase in step-down transformer?

A

current

B

voltage

C

power

D

frequency

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The correct Answer is:
A
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Statement-1 : A step up transformer can also be used as a step down transformer. Statement-2 : This is because E_s/E_P = n_s/n_P

A thermal power plant produed electric power of 600kW at 4000V, which is to be transported to a place 20 km away form the power plant for consumer's usage. It can be transported either directly with a cable of large current carrying capacity or by sing a combination of step-up and step-down transfprmers at the two ends. THe drawback of the direct transmission is the large energy dissipation. In the method wsing transformers, the dissipatiion is much smaller. In this method a step-up transformers is used at the plant side so that the current is reduced to a smaller value. At the consumers'end, a step-down transformer is used to supply power to the consumers at the specified lower voltage. It is reasonable to assume that the power cable is purely resostive and the transformers are ideal with power factor unity. All the currents and voltagementioned are values. In the method using the transformers assume that the ratio of the number of turns in the primary to that in the secondary in the step-up transformer is 1:10 if the power to the consumers has to be supplied at 200V, the ratio of the number of turns in the primary to that in the secondary in the step-down transformer is

The secondary coil of an ideal step down transformer is delivering 500 watt power at 12.5 A current. If the ratio of turns in the primary to the secondary is 5 : 1 then the current flowing in the primary coil will be:

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For an ideal step-down transformer, the quantity which is constant for both the coils is

The transformation ratio in the step -up transformer is

The output of a step-down transformer is measured to be 24 V when connected to a 12 watt light bulb. The value of the peak current is

The output of a step-down transformer is measured to be 24 V when connected to a 12 watt light bulb. The value of the peak current is

The output of a step-down transformer is measured to be 24 V when connected to a 12 watt light bulb. The value of the peak current is

A power transmission line feeds input power at 2200 V to a step-down transformer with its primary windings having 3000 turns. Find the number of turns in the secondary to get the power output at 220 V .

RESONANCE ENGLISH-ELECTROMAGNETIC INDUCTION-Exercise
  1. The self-inductance of a coil is 2H. The current in the coil changes f...

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  2. Area of a coil is 0.16m^2. If the magnetic field through it changes fr...

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  3. What will increase in step-down transformer?

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  4. If in a coil rate of change of area is 5 m^(2) / milli second and cur...

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  5. An electron beam is moving near to a conducting loop then the induced...

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  6. The magnetic flux linked with a coil, in webers is given by the equati...

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  7. A metal conductor of length 1 m rotates vertically about one of its en...

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  8. The resistance of a coil is 5 ohm and a current of 0.2A is induced in ...

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  9. If the length and area of cross-section of an inductor remain same but...

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  10. Self-inductance of a solenoid depend on-

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  11. When current flowing in a coil changes from 3A to 2A in one millisecon...

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  12. In the figure, magnetic energy stored in the coil is

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  13. The self-inductance of solenoid of length L, area of cross-section S a...

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  14. Energy is stored in the choke coil in the form of :

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  15. The self-inductances of two identical coils are 0.1H. They are wound o...

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  16. The magnetic flux through Circuit of resistance R chages by an a...

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  17. A conducting circular loop is placed in a uniform magnetic field, B = ...

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  18. Which of the following is proportional to energy density in magnetic f...

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  19. When two co - axial coils having same current in same direction are b...

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  20. A magnetic field can be produced by

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