Important Questions On Uses Of Transformer

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A transformer is a device that is used to transfer electric energy from one alternating-current circuit to one or more circuits. It transfers electric energy either by increasing (stepping up) or reducing (stepping down) the voltage.

Different Types Of Transformers

The video below explains this:

Transformer Detailed Video Explanation:

Important Questions On Uses Of Transformer

Ques. What is a transformer? (1 Mark)

Ans. An electric transformer is a static device which is utilized to transfer electrical energy with no direct electrical contact from one circuit to another. While transforming electrical energy mutual induction between two windings takes place.

Ques. What are the properties of an ideal transformer? (2 Marks)

Ans. The properties of an ideal transformer are:

Shouldn’t be any magnetic leakage
There should be no iron losses
no winding losses
infinite permeability of the core
zero magnetising current

Ques. Define leakage flux in the transformer. (1 Mark)

Ans. In a transformer, the main flux links with the primary and secondary winding. Some portion of the main flux generated by primary winding does not link with the secondary winding and this portion of flux which is not useful in any work is known as leakage flux.

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Ques. List a few uses of a transformer. (2 Marks)

Ans. Transformers are used in:

power generation grid
distribution sector
Transmission
electric energy consumption.

Ques. State the types of transformers. (1.5 Marks)

Ans. The types of transformers are:

Autotransformers
Power transformers
Generator set up transformers
Auxiliary transformers

Ques. What is the basic principle of transformers? (2 Marks)

Ans. The basic principle of transformers are:

Any transformer works on the principle of mutual induction.
Mutual induction is the phenomenon due to which, when the amount of magnetic flux linked with a coil changes.
An E.M.F. is induced in the neighbouring coil.
A transformer is made up of a rectangular iron core.

Ques. State three advantages of transformers. (2 Marks)

Ans. The advantages of transformers are:

The transformer is efficient for the high-frequency range.
Transformers offer good mechanical strength.
The transformer is widely used in power transmission

Ques. What are the conditions for maximum efficiency of a transformer? (2 Marks)

Ans. There are two main losses in transformers; copper losses and iron losses.

Iron losses are fixed losses and do not change with any change in load whereas copper losses are variable losses and increase with an increase in load. At no/zero load conditions, copper losses are almost negligible.

As the load on transformers increases their copper losses also increase. So, there will be a load at which copper losses become equal to variable losses and at that condition when the copper losses become equal to the iron loss, the efficiency of the transformer will maximum.

Ques. List three disadvantages of transformers. (2 Marks)

Ans. Three disadvantages of transformers are:

Noisy
A transformer will not work with DC voltage under any condition.
The physical size of the transformer is directly related to the amount of power to be desired.

Ques. Which oils are used in the transformer? (2 Marks)

Ans. Majorly mineral oil and synthetic oil are used in transformer.

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CBSE CLASS XII Related Questions

1.
Two air-filled capacitors of capacitances $C_1$ and $C_2$ are connected in parallel with a dc battery. After the capacitors are fully charged, a slab of dielectric constant K is inserted between the plates of each capacitor. How will the (i) charge on each capacitor and (ii) energy stored in the capacitor affected after the slab is introduced.

View Solution

2.
Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?

The total charge of the two spheres is conserved.
Both spheres attain the same potential.
The final potential of the system equals $\frac{1}{4\pi\epsilon_0} \frac{(q_1 + q_2)}{(r_1 + r_2)}$
The final potential of the system equals $\frac{1}{4\pi\epsilon_0} \frac{(q_1 + q_2) (r_1 + r_2)}{r_1 r_2}$

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3.
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Two capacitors, one of $3 \ \mu$F and the other of $6 \ \mu$F, are connected in series in the circuit as shown in the figure, for a long time. }

4.
The resistance of a metal wire at $ 20^\circ \text{C} $ is $ 1.05 \, \Omega $ and at $ 100^\circ \text{C} $ is $ 1.38 \, \Omega $. Determine the temperature coefficient of resistivity of this metal.

View Solution

5.
A charged particle $+q$ in an electric field $\vec{E}$ experiences a force in the direction of the electric field. As a result, its kinetic energy changes. Similarly, the charged particle also experiences a force when it moves in a magnetic field $\vec{B}$. But this magnetic force is perpendicular to both velocity $\vec{v}$ of the charged particle and the magnetic field $\vec{B}$, so it cannot change the kinetic energy of the charged particle. Consider two charged particles 1 and 2 of masses $m$ and $\frac{m}{2}$ having charges $-q$ and $+2q$ respectively. They are accelerated from rest through the same potential difference $V$ and acquire kinetic energy $K_1$ and $K_2$. Then they enter in a region of uniform magnetic field $\vec{B}$ perpendicular to their velocities.

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Important Questions On Uses Of Transformer

Transformer Detailed Video Explanation:

Important Questions On Uses Of Transformer

CBSE CLASS XII Related Questions

2.
Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?

4.
The resistance of a metal wire at \( 20^\circ \text{C} \) is \( 1.05 \, \Omega \) and at \( 100^\circ \text{C} \) is \( 1.38 \, \Omega \). Determine the temperature coefficient of resistivity of this metal.

Similar Physics Concepts

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Important Questions On Uses Of Transformer

Transformer Detailed Video Explanation:

Important Questions On Uses Of Transformer

CBSE CLASS XII Related Questions

2.Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?

4. The resistance of a metal wire at \( 20^\circ \text{C} \) is \( 1.05 \, \Omega \) and at \( 100^\circ \text{C} \) is \( 1.38 \, \Omega \). Determine the temperature coefficient of resistivity of this metal.

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

2.
Two metal spheres of radii $r_1$ and $r_2$ ($> r_1$) having charges $q_1$ and $q_2$ respectively kept in air, are brought in contact. Which of the following statements is not correct ?

4.
The resistance of a metal wire at \( 20^\circ \text{C} \) is \( 1.05 \, \Omega \) and at \( 100^\circ \text{C} \) is \( 1.38 \, \Omega \). Determine the temperature coefficient of resistivity of this metal.