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तमिलनाडु बोर्ड ऑफ सेकेंडरी एज्युकेशनएसएसएलसी (अंग्रेजी माध्यम) कक्षा ९

State whether true or false. If false, correct the statement. A transformer can step up direct current. - Science

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प्रश्न

State whether true or false. If false, correct the statement.

A transformer can step up direct current.

विकल्प

  • True

  • False

MCQ
सत्य या असत्य

उत्तर

False

Correct Statement: A transformer can step up alternating current.

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  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 5: Magnetism and Electromagnetism - Exercise [पृष्ठ ६४]

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सामाचीर कलवी Science [English] Class 9 TN Board
अध्याय 5 Magnetism and Electromagnetism
Exercise | Q IV. 5. | पृष्ठ ६४

संबंधित प्रश्न

State the principle on  which transformer works.


Complete the following sentence :
……… energy is converted into …………energy by an electric motor.


Draw a labeled diagram of a full wave rectifier circuit. State its working principle. Show the input-output waveforms ?


Copy the given diagram of a transformer and complete it. Name the parts A and B. Name the part you have drawn to complete the diagram. What is the material of this part? Is this transformer a step-up or step-down? Give reason.


A transformer lowers e.m.f. 220 V to 12 volts. If the number of turns in primary are 8800, how many turns are in secondary coil?


The transformation ratio in the step-up transformer is ______.

Electrical energy is transmitted over large distances at high alternating voltages. Which of the following statements is (are) correct?

  1. For a given power level, there is a lower current.
  2. Lower current implies less power loss.
  3. Transmission lines can be made thinner.
  4. It is easy to reduce the voltage at the receiving end using step-down transformers.

A 60 W load is connected to the secondary of a transformer whose primary draws line voltage. If a current of 0.54 A flows in the load, what is the current in the primary coil? Comment on the type of transformer being used.


Two coils P and Q are kept near each other. When no current flows through coil P and current increase in coil Q at the rate 10A/s, the emf in coil P is 15mV. When coil Q carries no current and current of 1. 8A flows through coil P, the magnetic flux linked with the coil Q is ______.


Explain why core of a transformer is always laminated.


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