In which of the following devices, the eddy current effect is not used?
1. Electric heater
2. Induction furnace
3. Magnetic braking in train
4. Electromagnet
Subtopic: Â Eddy Current |
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Level 3: 35%-60%
NEET - 2019
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Which of the following is not based on the application of eddy currents?
1. Speedometer
2. Dead-beat galvanometer
3. Energy meter
4. Tangent galvanometer
Subtopic: Â Eddy Current |
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Level 3: 35%-60%
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The slotting processes in a metallic sheet results in:
| 1. | The increase of the resistance in the path for circulation of current. |
| 2. | Decrease in the strength of eddy current. |
| 3. | A feeble in the electromagnetic damping. |
| 4. | All of these |
Subtopic: Â Eddy Current |
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Level 1: 80%+
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Eddy currents are produced in a material when it is:
| 1. | heated. |
| 2. | placed in an electric field. |
| 3. | placed in a uniform constant magnetic field. |
| 4. | placed in a time-varying magnetic field. |
Subtopic: Â Eddy Current |
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Level 2: 60%+
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Eddy currents are used in:
1. Induction furnace
2. Electromagnetic brakes
3. Speedometers
4. All of these
Subtopic: Â Eddy Current |
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Level 1: 80%+
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | Iron loss is minimized by using a laminated core. |
| Reason (R): | Lamination of core restricts eddy current. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Eddy Current |
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Level 1: 80%+
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A metal plate is getting heated. It can be because:
| (a) | a direct current is passing through the plate. |
| (b) | it is placed in a time-varying magnetic field. |
| (c) | it is placed in space varying magnetic field but does not vary with the time. |
| (d) | a current (either direct or alternating) is passing through the plate. |
(1). (a, b, d)
(2). (a, c, d)
(3). (b, c, d)
(4). (a, b, c)
Subtopic: Â Eddy Current |
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Level 2: 60%+
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