MCQs On Uses Of Transformer

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A transformer is a device which is used in the electrical industry for power transmission of electric energy from one electrical circuit to another circuit or multiple circuits.

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Transformer Detailed Video Explanation:

MCQs On Uses Of Transformer

Ques 1. The core of a transformer is laminated to (1 Mark)

Reduce hysteresis loss
Reduce copper losses
Reduce eddy's current losses
All of the above

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Ans. c. Reduce eddy's current losses

Explanation: The core of a transformer is laminated to reduce eddy's current losses.

Ques 2. In a transformer, energy is conveyed from primary to secondary through (1 Mark)

Air
Flux
Cooling coil
All of the above

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Ans. b. Flux

Explanation: Energy in a transformer is conveyed through flux from primary to secondary.

Ques 3. The path of magnetic flux in a transformer should have (1 Mark)

High resistance
Low resistance
High reluctance
Low reluctance

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Ans. d. Low reluctance

Explanation: The path of magnetic flux in a transformer should have a low reluctance

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Ques 4. The no-load on a transformer is carried out to determine the (1 Mark)

Magnetising current
Magnetising current and loss
Copper loss
The efficiency of a transformer

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Ans. b. Magnetising current and loss

Explanation: The no-load on a transformer is carried out to determine the magnetising current and loss

Ques 5. The degree of mechanical vibrations produced by the laminations of a transformer depends on (1 Mark)

Size of a laminations
Gauge of laminations
Tightness of clamping
All of the above

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Ans. d. All of the above

Explanation: The degree of mechanical vibrations produced by the laminations of a transformer depends on the size of a lamination, gauge of laminations and tightness of clamping.

Ques 6. The dielectric strength of transformer oil is expected to be (1 Mark)

100 kV
1kV
33kV
330kV

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Ans. c. 33kV

Explanation: The dielectric strength of transformer oil is expected to be 33kV.

Ques 7. The efficiency of a transformer is maximized when (1 Mark)

Hysteresis losses = eddy current losses
Copper losses = iron losses
Copper losses = hysteresis losses
Eddy current losses = copper losses

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Ans. Copper losses = iron losses

Explanation: When copper losses = iron losses, the efficiency of a transformer is maximized.

Ques 8. No-load current in a transformer (1 Mark)

Leads the voltage by about 75°
Lags behind the voltage by about 75°
Leads the voltage by about 15°
Lags behind the voltage by about 15°

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Ans. b. Lags behind the voltage by about 75°

Explanation: No-load current in a transformer lags behind the voltage by about 75°.

Ques 9. Which of the following is not a part of the transformer installation (1 Mark)

Breather
Exciter
Conservator
Buchholz relay

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Ans. b. exciter

Explanation: Exciter is not used while installing transformer.

Ques 10. The purpose of providing iron ore in a transformer is to (1 Mark)

Reduce hysteresis loss
Reduce eddy current loss
Provide support to windings
Reduce the reluctance of the magnetic path

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Ans. d. Reduce the reluctance of the magnetic path

Explanation: The purpose of providing iron ore in a transformer is to reduce the reluctance of the magnetic path.

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CBSE CLASS XII Related Questions

1.
The number of free electrons per unit volume ($\text{m}^3$) in a wire made of copper (resistivity $1.72 \times 10^{-8}\,\Omega\,\text{m}$) is $8.5 \times 10^{28}$. Calculate the average number of collisions made by an electron in one second when an electric field is maintained in the wire.
View Solution
2.
A parallel beam of monochromatic light falls normally on a single slit of width $a$ and a diffraction pattern is observed on a screen placed at distance $D$ from the slit. Explain:
(I) the formation of maxima and minima in the diffraction pattern, and
(II) why the maxima go on becoming weaker and weaker with its increasing number $n$.
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3.
In a region, the electric potential varies as $V = 10 - 50x$, where $V$ is in volts and $x$ is in meters. The electric field in the region is
- $10\ \text{N/C}$ along $+x$
- $10\ \text{N/C}$ along $-x$
- $50\ \text{N/C}$ along $+x$
- $50\ \text{N/C}$ along $-x$
View Solution
4.
Consider the nuclear reaction $ X \to Y + Z $. Let $ M_x $, $ M_y $, and $ M_z $ be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?
- $ (M_x - M_z)<M_y $
- $ (M_x - M_y)<M_z $
- $ M_x>(M_y + M_z) $
- $ M_x<(M_y + M_z) $
View Solution
5.
A ray of light MN is incident normally on the face corresponding with side AB of a prism with an isosceles right-angled triangular base ABC. Trace the path of the ray as it passes through the prism when the refractive index of the prism material is (i) $\sqrt{2}$, and (ii) $\sqrt{3}$.
View Solution
6.
Two point charges -Q and Q are located at points (d, 0) and (0, d) respectively, in x-y plane. The electric field E at the origin will be:
- $\frac{1}{4\pi\epsilon_0} \frac{\sqrt{2}Q}{d^2} (\hat{i} - \hat{j})$
- $\frac{1}{4\pi\epsilon_0} \frac{\sqrt{2}Q}{d^2} (-\hat{i} - \hat{j})$
- $\frac{1}{4\pi\epsilon_0} \frac{Q}{d^2} (\hat{i} - \hat{j})$
- $\frac{1}{4\pi\epsilon_0} \frac{Q}{d^2} (-\hat{i} - \hat{j})$
View Solution

View All

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MCQs On Uses Of Transformer

Transformer Detailed Video Explanation:

MCQs On Uses Of Transformer

CBSE CLASS XII Related Questions

1.
The number of free electrons per unit volume ($\text{m}^3$) in a wire made of copper (resistivity $1.72 \times 10^{-8}\,\Omega\,\text{m}$) is $8.5 \times 10^{28}$. Calculate the average number of collisions made by an electron in one second when an electric field is maintained in the wire.

3.
In a region, the electric potential varies as \(V = 10 - 50x\), where \(V\) is in volts and \(x\) is in meters. The electric field in the region is

4.
Consider the nuclear reaction \( X \to Y + Z \). Let \( M_x \), \( M_y \), and \( M_z \) be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

5.
A ray of light MN is incident normally on the face corresponding with side AB of a prism with an isosceles right-angled triangular base ABC. Trace the path of the ray as it passes through the prism when the refractive index of the prism material is (i) $\sqrt{2}$, and (ii) $\sqrt{3}$.

6.
Two point charges -Q and Q are located at points (d, 0) and (0, d) respectively, in x-y plane. The electric field E at the origin will be:

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

MCQs On Uses Of Transformer

Transformer Detailed Video Explanation:

MCQs On Uses Of Transformer

CBSE CLASS XII Related Questions

1.The number of free electrons per unit volume ($\text{m}^3$) in a wire made of copper (resistivity $1.72 \times 10^{-8}\,\Omega\,\text{m}$) is $8.5 \times 10^{28}$. Calculate the average number of collisions made by an electron in one second when an electric field is maintained in the wire.

3.In a region, the electric potential varies as \(V = 10 - 50x\), where \(V\) is in volts and \(x\) is in meters. The electric field in the region is

4.Consider the nuclear reaction \( X \to Y + Z \). Let \( M_x \), \( M_y \), and \( M_z \) be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

5.A ray of light MN is incident normally on the face corresponding with side AB of a prism with an isosceles right-angled triangular base ABC. Trace the path of the ray as it passes through the prism when the refractive index of the prism material is (i) $\sqrt{2}$, and (ii) $\sqrt{3}$.

6.Two point charges -Q and Q are located at points (d, 0) and (0, d) respectively, in x-y plane. The electric field E at the origin will be:

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
The number of free electrons per unit volume ($\text{m}^3$) in a wire made of copper (resistivity $1.72 \times 10^{-8}\,\Omega\,\text{m}$) is $8.5 \times 10^{28}$. Calculate the average number of collisions made by an electron in one second when an electric field is maintained in the wire.

3.
In a region, the electric potential varies as \(V = 10 - 50x\), where \(V\) is in volts and \(x\) is in meters. The electric field in the region is

4.
Consider the nuclear reaction \( X \to Y + Z \). Let \( M_x \), \( M_y \), and \( M_z \) be the masses of the three nuclei X, Y, and Z respectively. Then which of the following relations hold true?

5.
A ray of light MN is incident normally on the face corresponding with side AB of a prism with an isosceles right-angled triangular base ABC. Trace the path of the ray as it passes through the prism when the refractive index of the prism material is (i) $\sqrt{2}$, and (ii) $\sqrt{3}$.

6.
Two point charges -Q and Q are located at points (d, 0) and (0, d) respectively, in x-y plane. The electric field E at the origin will be: