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Statement (A) : In high current low volt...

Statement (A) : In high current low voltage windings of a transformer thick wire is used to minimize energy loss due to heat produced
Statement (B) : The core of any transformer is laminated so as to reduce the erergy loss due to eddy currents.

A

`A` is true but `B` is false

B

Both `A` and `B` is true

C

`A` is false but `B`d is true

D

Both `A` and `B` are false

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Statement (A) : Flux leakage in a transformer can be minimized by winding the primary and secondary coils one over the other. Statement (B) : Core of the transformer is made of soft iron

Assertion : A laminated core is used in transformers to increase eddy currents. Reason : The efficiency of a transformer increases with increase in eddy currents.

Statement (A) : Step up transformer converts low voltage, high current to high voltage, low current Statement (B) : Transformer works on both ac and dc.

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. If hte direct transmission method with a cable of resistance 0.4(omega) km^(-1) is used, the power dissipation (in %) during transmission is

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

NARAYNA-ALTERNATING CURRENT-C.U.Q
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  2. A step up transformer is connected on the primary side to a rechargabl...

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  4. In a step down transformer, the number of turns in the primary is alwa...

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  5. The transformer ratio of a step up transformer is

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  6. A setup transformer develops 440 V in secondary coil for an input of 2...

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  7. Assertion (A) : If changing current is flowing through a machine with ...

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  9. The magnitude of the e.m.f. across the secondary of a transformer does...

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  10. For an ideal transformer ratio of output ot the input power is always

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  11. Consider the following two statements A and B and identify the correct...

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  12. Statement (A) : Flux leakage in a transformer can be minimized by wind...

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  13. Statement (A) : In high current low voltage windings of a transformer ...

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  14. Statement (A) : Step up transformer converts low voltage, high current...

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  15. To reduce the iron losses in a transformer, the core must be made of a...

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  16. Maximum efficiency of a transformer depends on

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  17. For an LCR series circuit with an aac source of angular frequency omeg...

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  18. The value of current in tow series LCR circuits at resonance is same, ...

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  19. When an ac source of emfe=E(0) sin (100 t) is connected across a circu...

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