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Lesson 2-2-2

QuestionAnswer
Explain the difference between portable and permanent test instruments. Portable is used to take temporary measurements and is typically powered by batteries. Permanent is a device that is installed in a process or at a bench to continually measure and display quantities and is powered by a 115v receptacle
Ac voltage is voltage in a circuit that flows in one direction only. True or false False
AC voltage is voltage in a circuit that reverses its direction of flow at regular intervals and is stated and measured as a peak, average, or ___ values. RMS
The ___ value of a sine wave is the maximum instantaneous value of either the positive or negative values in the sine wave. Peak
The average value of an AC sine wave is the mathematical mean of all instantaneous voltage values in the sine wave and is equal to ___ of the peak value. 0.637
A(n) is a test instrument with a bulb that is connected to two leads to give a visual indication when voltage is present in a circuit. Test light
A fault occurs when any hot (energized) conductor touches a metal part that is not ___? Grounded
What are the disadvantages of voltage indicators? Is that voltage indicators only indicate that voltage is presented but do not indicate the actual voltage amount. They may not provide an indication that voltage is present ,even when voltage is present , as when the wire being tested is shielded.
Explain the difference between a voltage indicator and a voltage tester. Voltage indicator tells you if voltage is present. Voltage tester tells you how much voltage is there.
One advantage of voltage testers is that they have a lower impedance (resistance) and draw more current than voltage indicators, which allows them to be used for testing___. GFCIs
What can a circuit analyzer be used to determine? Circuit wiring faults ( reverse polarity or open ground)
When voltage measurements are different from what was expected, the voltage measurement is more likely to be lower than normal. True or false True
When a three phase motor fails due to voltage unbalanced, one or two of the stator windings became blackened. The ___ winding is the winding with the largest voltage unbalance. Darkest
An ohmmeter is a test instrument that measures ___, the opposition to the flow of electrons in a circuit. Resistance
The higher the resistance in a circuit, the higher the current flow through the circuit. True or false False
A closed switch that is operating properly has continuity. True or false True
What can ohmmeter measurements be used to determine? The resistance (condition) of de-energized components or circuits.
When using an ohmmeter, the resistance of all components connected in parallel with the component being tested affects, and typically lowers the resistance reading. True or false True
How is a megohmeter different from an ohmmeter? Megohmmeter is used to measure insulation determination on various wires by measuring high resistance values during high voltage test conditions. Ohmmeters measures resistance.
___ leakage current is current that flows from areas on conductors where insulation has been removed to allow electrical connections. Surface
How can capacitive leakage current be kept to a minimum. By separating or twisting the conductors along the run.
___ is measured in amperes. Current
A clamp on ammeter is a test instrument that measures current in a circuit by measuring the strength of the ___ field around a single conductor. Magnetic
In-line ammeters require the circuit to be ___ so the ammeter can be inserted into the circuit to acquire a reading. Opened
A clamp on ammeter is typically used to measure current in a circuit with over 1 A of current. True or false True
Why is measuring current a particularly useful troubleshooting technique? Because only a current measurement can be used by an electritian to determine how much a circuit is loaded.
Many test instruments include a(n) ___ in the current-measuring circuit to prevent damage caused by excessive current. Fuse
The problem with small three-phase voltage unbalances is that they cause high ___ imbalances, which cause excessive heat, resulting in insulation breakdown. Current
Any time a three phase current unbalance exceeds ___% electricians must test for voltage unbalance . 10%
Most analog multimeters have several calibrated ___ that corresponds to the different selector switch settings (ac,DC, and R) and placement of the test leads (ma jack and 10 A jack). Scales
What does the decibel scales on a multimeter indicate ? Indicates the comparison between two or more signal powers or voltages
Most digital multimeters displays include a(n) ___ to show changes and trends in a circuit. Bar graph
Voltage measurements using the ___ on a digital multimeter are useful in identifying low-voltage conditions caused by large motors starting up, by temporary voltage losses, or by a circuit overloading or high voltage surges. Min Max mode
How is the relative mode on a digital multimeter useful?
Identify the test instrument with the appropriate item in the illistration B is test light F is clam-on-ammeter A is analog multimeter H receptacle tester D is voltage tester C is circuit analyzer E is digital multimeter G is voltage indicator
Identify the multimeter function or component with the symbol in the illustration C is measure AC current H is measure resistance A is measure capacitance G is measure AC and DC voltage E is function switch B is measure temperature F is measure AC voltage D is measure AC and DC current
Identify the clamp-on- ammeter component with the appropriate part in the illustration C is display H is jaws A is alignment marks F is common jack B is function switch D is voltage or resistance jack G is trigger E is removable test leads
Determine weather the tested diodes are good, shorted, or open based on the meter readings in the illustration. The solid probe leads represent the first reading. The dashed probe leads represent the second reading. Diode 1 is shorted Diode 2 is good Diode 3 is open
Created by: swcurtis
 

 



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