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What will increase in step-down transfor...

What will increase in step-down transformer?

A

Voltage

B

Current

C

Power

D

Current density

Text Solution

Verified by Experts

The correct Answer is:
B
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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

Knowledge Check

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

    A
    current in the coils
    B
    voltage across the coils
    C
    resistance of coils
    D
    power in the coils

  • 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
    `(1)/(sqrt(2))A`
    B
    `sqrt(2)A`
    C
    `2A`
    D
    `2sqrt(2)A`

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    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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    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

    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 .

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