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 Electromechanical Indicating Instruments 20 Flashcards |
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What is the principle on which moving iron instruments operate? |
Card: 1 / 20 |
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The principle that the iron plate is attracted towards a magnetic field, with the force of attraction depending on the strength of the magnetic field. |
Card: 2 / 20 |
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Fill in the blank: The moving iron instrument uses a ______ as an electromagnet. |
Card: 3 / 20 |
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Stationary coil |
Card: 4 / 20 |
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True or False: The deflection of moving iron instruments is directly proportional to the current flowing through the coil. |
Card: 5 / 20 |
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False. The deflection torque is proportional to the square of the current. |
Card: 6 / 20 |
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Riddle: I am an instrument that attracts an iron vane from lower to higher magnetic fields. What am I? |
Card: 7 / 20 |
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Attraction type moving iron instrument |
Card: 8 / 20 |
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Which type of moving iron instrument has two vanes that repel each other? |
Card: 9 / 20 |
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Repulsion type instrument |
Card: 10 / 20 |
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Fill in the blank: The main error in moving iron instruments due to the magnetic properties of iron is called ______. |
Card: 11 / 20 |
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Hysteresis error |
Card: 12 / 20 |
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What are the two types of errors present in moving iron instruments? |
Card: 13 / 20 |
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Errors occurring in both AC and DC, and errors occurring only in AC. |
Card: 14 / 20 |
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True or False: Electrodynamometer instruments can be calibrated with a DC source and used for AC measurements without modification. |
Card: 15 / 20 |
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True. |
Card: 16 / 20 |
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Riddle: I can read both AC and DC, with a scale that is not uniform due to my square-law response. What am I? |
Card: 17 / 20 |
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Electrodynamometer-type instrument |
Card: 18 / 20 |
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What is the main advantage of electrodynamometer-type instruments? |
Card: 19 / 20 |
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They can be used for accurate measurements of RMS values for both AC and DC. |
Card: 20 / 20 |
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