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.

Also Check:

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CBSE CLASS XII Related Questions

1.
A tank is filled with a liquid to a height of \( 12.5 \, \text{m} \). The apparent depth of a needle lying at the bottom of the tank is measured to be \( 9.0 \, \text{m} \). Calculate the speed of light in the liquid.
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2.
Suppose a pure Si crystal has \( 5 \times 10^{28} \) atoms per \( \text{m}^3 \). It is doped with \( 5 \times 10^{22} \) atoms per \( \text{m}^3 \) of Arsenic. Calculate majority and minority carrier concentration in the doped silicon. (Given: \( n_i = 1.5 \times 10^{16} \, \text{m}^{-3} \))
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Write any two features of nuclear forces.
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6.
Two thin lenses of focal length \( f_1 \) and \( f_2 \) are placed in contact with each other coaxially. Prove that the focal length \( f \) of the combination is given by \[ f = \frac{f_1 f_2}{f_1 + f_2}. \]
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MCQs On Uses Of Transformer

Transformer Detailed Video Explanation:

MCQs On Uses Of Transformer

CBSE CLASS XII Related Questions

1.
A tank is filled with a liquid to a height of \( 12.5 \, \text{m} \). The apparent depth of a needle lying at the bottom of the tank is measured to be \( 9.0 \, \text{m} \). Calculate the speed of light in the liquid.

2.
Suppose a pure Si crystal has \( 5 \times 10^{28} \) atoms per \( \text{m}^3 \). It is doped with \( 5 \times 10^{22} \) atoms per \( \text{m}^3 \) of Arsenic. Calculate majority and minority carrier concentration in the doped silicon. (Given: \( n_i = 1.5 \times 10^{16} \, \text{m}^{-3} \))

3.
Write any two features of nuclear forces.

4.
If both the number of protons and the neutrons are conserved in each nuclear reaction, in what way is mass converted into energy (or vice versa) in a nuclear reaction? Explain.

5.
If Bohr’s quantization postulate (angular momentum \( = \frac{nh}{2\pi} \)) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.

6.
Two thin lenses of focal length \( f_1 \) and \( f_2 \) are placed in contact with each other coaxially. Prove that the focal length \( f \) of the combination is given by \[ f = \frac{f_1 f_2}{f_1 + f_2}. \]

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.A tank is filled with a liquid to a height of \( 12.5 \, \text{m} \). The apparent depth of a needle lying at the bottom of the tank is measured to be \( 9.0 \, \text{m} \). Calculate the speed of light in the liquid.

2.Suppose a pure Si crystal has \( 5 \times 10^{28} \) atoms per \( \text{m}^3 \). It is doped with \( 5 \times 10^{22} \) atoms per \( \text{m}^3 \) of Arsenic. Calculate majority and minority carrier concentration in the doped silicon. (Given: \( n_i = 1.5 \times 10^{16} \, \text{m}^{-3} \))

3. Write any two features of nuclear forces.

4. If both the number of protons and the neutrons are conserved in each nuclear reaction, in what way is mass converted into energy (or vice versa) in a nuclear reaction? Explain.

5. If Bohr’s quantization postulate (angular momentum \( = \frac{nh}{2\pi} \)) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.

6.Two thin lenses of focal length \( f_1 \) and \( f_2 \) are placed in contact with each other coaxially. Prove that the focal length \( f \) of the combination is given by \[ f = \frac{f_1 f_2}{f_1 + f_2}. \]

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
A tank is filled with a liquid to a height of \( 12.5 \, \text{m} \). The apparent depth of a needle lying at the bottom of the tank is measured to be \( 9.0 \, \text{m} \). Calculate the speed of light in the liquid.

2.
Suppose a pure Si crystal has \( 5 \times 10^{28} \) atoms per \( \text{m}^3 \). It is doped with \( 5 \times 10^{22} \) atoms per \( \text{m}^3 \) of Arsenic. Calculate majority and minority carrier concentration in the doped silicon. (Given: \( n_i = 1.5 \times 10^{16} \, \text{m}^{-3} \))

3.
Write any two features of nuclear forces.

4.
If both the number of protons and the neutrons are conserved in each nuclear reaction, in what way is mass converted into energy (or vice versa) in a nuclear reaction? Explain.

5.
If Bohr’s quantization postulate (angular momentum \( = \frac{nh}{2\pi} \)) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.

6.
Two thin lenses of focal length \( f_1 \) and \( f_2 \) are placed in contact with each other coaxially. Prove that the focal length \( f \) of the combination is given by \[ f = \frac{f_1 f_2}{f_1 + f_2}. \]