Home
Class 12
PHYSICS
A small town with a demand of 800 kW of ...

A small town with a demand of 800 kW of power at 220 V is situated 15 km away from an electric plant generating power at 440 V. The resistance of the two wire line carrying power is `0.5Omega`.`km^-1`. The line gets power from the line through a 4000-220 V step-down transformer at a substation in the town.
Characterise the step-up transformer at the plant.

Text Solution

Verified by Experts

Voltage drop in the line
`I_(rms).R=200times15=3000V`
`therefore` The plant transformer should supply (4000+3000)=7000V
`therefore` `A440V//7000V` step-up transformer should be used.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • ALTERNATING CURRENT

    CHHAYA PUBLICATION|Exercise NCERT TEXTBOOK QUESTIONS WITH ANSWER HINT (MCQ-2)|4 Videos

  • ALTERNATING CURRENT

    CHHAYA PUBLICATION|Exercise EXERCISE (Multiple Choice Question)|32 Videos

  • ALTERNATING CURRENT

    CHHAYA PUBLICATION|Exercise NCERT TEXTBOOK QUESTIONS WITH ANSWER HINT|33 Videos

  • CHHAYA PUBLICATION|Exercise EXAMPLE|1 Videos

  • ATOM

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|18 Videos

Similar Questions

Explore conceptually related problems

A small town with a demand of 800 kW of power at 220 V is situated 15 km away from an electric plant generating power at 440 V. The resistance of the two wire line carrying power is 0.5Omega . km^-1 . The line gets power from the line through a 4000-220 V step-down transformer at a substation in the town. How much power must the plant supply, assuming there is negligible power loss due to leakage.

A small town with a demand of 800 kW of power at 220 V is situated 15 km away from an electric plant generating power at 440 V. The resistance of the two wire line carrying power is 0.5Omega . km^-1 . The line gets power from the line through a 4000-220 V step-down transformer at a substation in the town. Estimate the line power loss in the form of heat?

Knowledge Check

  • Two cities are 150 km apart . Electric power is sent from one city to another city through copper wires . The fall of potential per km is 8 volt and the averge resistance per km is 0.5Omega .The power loss in the wire is

    A
    `19.2W`
    B
    `19.2kW`
    C
    `19.2J`
    D
    `12.2kW`

  • Two cities are 150 km apart. Electric power is set from one city to another city through copper wires. The fall of potential per km is 8 volt and the average resistance per km is 0.5Omega The power loss in the

    A
    19.2W
    B
    19.2 kW
    C
    19.2 J
    D
    12.2 kW

    • Similar Questions

    Explore conceptually related problems

    A small town with a demand of 800 kW of electric power at 220 V is situated 15 km away from an electric plant generating power at 440 V. The resistance of the two wire line carrying power is 0.5 Omega per km. The town gets power from the line through a 4000-220 V step-down transformer at a sub-station in the town. (a) Estimate the line power loss in the form of heat. (b) How much power must the plant supply, assuming there is negligible power loss due to leakage? (c) Characterise the step up transformer at the plant.

    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.

    A factory requires a power of 90 kW. The energy is tranmitted to the factory through a 2.5Omega line wire .If 10 % of the power generated is lost in transmission , calculate The trasmission line current the potential drop due to line resistance .

    Two electric bulbs each designed to operate with a power of 500 W in a 220 V line are connected in series in a 110 V line . What will be the power generated by each bulb ?

    2.2 kW power is supplied through a line of 10Omega resistance under 22000 V voltage differnce . What is the rate of heat dissipation in the line ?

    15 kW power is supplied through a line of 0.5Omega resistance under 250 V potential difference .Fimd the efficiency of the supply in percentage .

    Home
    Profile