ch 17

Even if a repair does not directly involve the electrical system, you must consider the location of electrical conductors and components to ensure that you are working safely.

True

The condition that exists when there is an unbroken path between two points in a circuit is called ____.

continuity

The ____ function on a multimeter allows a technician to test devices that conduct current in only one direction.

diode check

The ____ method of troubleshooting begins with a voltage measurement at the switching device near the middle of the ladder diagram rung.

divide and conquer

The ____ method of troubleshooting is most helpful on complex systems.

divide and conquer

A clamp-on ammeter requires the circuit to be broken to take a measure of circuit current.

false

A wattmeter is connected in parallel with the circuit being measured.

false

If a load device is not operating and the voltage across the device is 0 V, the problem can only be a short in the load device.

false

If a voltage check was incorrect, the device is faulty and requires no other checks.

false

In a dc circuit, an in-line ammeter's black lead is placed on the side of the load closest to the positive terminal of the circuit's power supply.

false

On a diode, the end closest to the anode is usually marked with a line or stripe.

false

The from control inward method of troubleshooting starts the line voltage and moves through each switching device.

false

The vertical lines in a ladder diagram identify the controls and loads located in a circuit.

false

Unlike in-line ammeters, ohmmeters are connected in series with the circuit or load being tested.

false

The ____ method of troubleshooting is used to determine the location of an open switching device.

hopscotching

In addition to measuring voltage, current, and resistance, digital multimeters can also be used to ____

measure capacitance check frequency Correct! All of the above. check diodes

In dc circuits, the ____ of the measured voltage is affected by the side of the load that each voltmeter lead is placed on.

polarity

The first location to perform a voltage check is ____.

terminals of the disconnect

To measure voltage polarity correctly in a dc circuit, a technician should place the voltmeter's red lead on the side of the load closest to ____ of the power supply.

the positive side

An insulation test should not be performed when a system is under vacuum because ____.

the reading will be inaccurate

A diode must be replaced if a meter registers a voltage for both meter lead configurations.

true

Connecting an analog voltmeter's leads to a dc circuit incorrectly will make the needle try to move backwards.

true

If a megohmmeter reading has decreased several weeks after motor maintenance, the compressor motor may fail soon.

true

If a voltmeter is used to measure the voltage across a length of conductor that has no resistance, there will be little or no voltage measurement.

true

If an in-line ammeter is accidentally connected in parallel, it may blow a fuse.

true

If both diode leads are left in a circuit when checking the diode, it may result in false readings.

true

In ac circuits, a voltmeter reads the voltage without regard to polarity because the current is constantly changing directions.

true

In the from load outward method of troubleshooting, voltage at the load device is checked first.

true

A(n) ____ is an instrument used to measure the true power used by a circuit or an electrical load.

wattmeter

Each horizontal line on a ladder diagram represents an individual ___

CIRCUIT AND LOAD

Which multimeter function allows a technician to test for an unbroken path between two points in a circuit?

Continuity.

The ratio between true power and apparent power in a circuit is always between ____.

0.0 and 1.0

In general, a megohm reading of ____ or higher indicates that the motor winding insulation is in excellent condition.

100 MW

Which of the following electrical instruments must be connected in series to take an accurate reading?

In-line ammeter

During which step of the troubleshooting procedure should you look for signs of prior melting and sparking at terminals and connections?

Initial inspection