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22 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Self-excited |
Which type of meters operate firm their own power sources? |
Page 3-2 |
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Electromagnetic |
Which principle do most common meters(voltmeters, am meters, and ohmmeters) operate on? |
Page 3-2 |
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Galvanometer |
Which type of meter is used to measure very low currents, such as those in bridge circuits? |
Page 3-3 |
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D'Arsonval |
Most DC instruments use meters based on some form of which type of meter movement? |
Page 3-5 |
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Shunt |
Which physically large, low resistance conductor connected in parallel with meter terminals and is used to carry the majority of the load current? |
Page 3-8 |
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Milliammeter |
What is the instrument called if the stunt is of such a value that the meter is calibrated in milliamperes? |
Page 3-8 |
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Manganin |
Which type of alloy are shunt strip usually made of? |
Page 3-10 |
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50 |
External shunts are generally used where currents greater than how many amperes must be measured? |
Page 3-10 |
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In-Series |
When you are using ammeters, a primary rule of safety is that such voltage-measuring instruments must always be connected in what way with a circuit? |
Page 3-15 |
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Meter-loading |
Which condition exists when the insertion of a meter into a circuit changes the operation of that circuit? |
Page 3-16 |
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Parallel |
When voltmeters are used, a primary rule of safety is that such voltage-measuring instruments must always be connected in which way with a circuit? |
Page 3-22 |
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Voltmeter |
What indicates the potential difference between two points in a circuit? |
Page 3-22 |
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Ohmmeter and Megger |
Which two instruments are most often used to check continuity, or to measure the resistance of a circuit or circuit component? |
Page 3-24 |
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Ohmmeter |
Which type of meter is widely used to measure resistance, and to check the continuity of electrical circuits and devices? |
Page 3-24 |
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Megger |
What is a widely used for measuring insulation resistance, such as that between a wire and the outer surface of it's insulation, and the insulation resistance of cables and insulators? |
Page 3-24 |
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500 |
Most meggers you will use are rated at how many volts? |
Page 3-31 |
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Rectifying |
Which devices are required for the D'Arsonval-type meter movement to enable it to be used for measuring ac voltage and currents? |
Page 3-34 |
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0.1 ampere |
When an electrodynamometer is used as a voltmeter, no problems in construction are encountered because the current required is not more than what? |
Page 3-35 |
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Wattmeter |
By what means is electric power measured? |
Page 3-36 |
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20 |
The maximum current range of electro-dynamic wattmeters is normally restricted to approximately how many amperes? |
Page 3-37 |
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0.25 |
Good-quality, portable watt meters usually have an accuracy of 0.2 to what percent? |
Page 3-38 |
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Ohmmeter |
Which device is used to check for shorts? |
Page 3-41 |
