Question 1

Light emitting diodes (LEDs) generally require a forward voltage of 1.7 to ____ volts.&#10;A) 2&#10;B) 2.3&#10;C) 2.5&#10;D) 2.7

Accepted Answer

A

Question 2

When using the oscilloscope, remember that the display is the product of ____.&#10;A) voltage and current&#10;B) voltage and resistance&#10;C) voltage and time&#10;D) resistance and time

Accepted Answer

The oscilloscope displays a graph of an electrical signal, showing how that signal varies over time. The vertical axis represents voltage, and the horizontal axis represents time.

Question 3

Most probe adjust points produce a square wave signal at about .5 volt.

Accepted Answer

Most probe adjust points produce a square wave signal at about 0.5 volts. This is because the probe adjust point is typically connected to the input of an oscilloscope, which is designed to display square waves. The amplitude of the square wave is typically set to 0.5 volts so that it can be easily seen on the oscilloscope display.

Question 4

The voltage range switch on an oscilloscope selects volts per division instead of volts full scale.

Accepted Answer

The voltage range switch on an oscilloscope adjusts the sensitivity of the vertical axis, which is measured in volts per division, allowing users to change how many volts are represented by each division on the screen, rather than setting a full scale voltage for the entire screen.

Question 5

The probe end of the oscilloscope contains three conductors.

Accepted Answer

The probe end of a typical oscilloscope usually contains two conductors: one for the signal and one for the ground.

Question 6

Digital multimeters are characterized by the fact that they contain a meter movement with a moving&#160; pointer.

Accepted Answer

Digital multimeters display measurements through a digital display, such as an LCD screen, and do not use a moving pointer like analog multimeters do.

Question 7

Digital ohmmeters operate similarly to analog ohmmeters.

Accepted Answer

Digital ohmmeters use electronic circuits to measure resistance and display the value on a digital screen, while analog ohmmeters use a moving needle and a scale to indicate resistance.

Question 8

If the meter is set on the 15-volt range, it will require a current of ____ microamperes to operate the&#160; meter movement.&#10;A) 25&#10;B) 50&#10;C) 75&#10;D) 100

Accepted Answer

The meter's operation on the 15-volt range requiring 50 microamperes is typical for many analog meters, where the full-scale deflection current is a standard value for the internal meter movement.

Question 9

An ____ is a device that divides or makes smaller the input signal.&#10;A) actuator&#10;B) armature&#10;C) alternator&#10;D) attenuator

Accepted Answer

An attenuator is a device specifically designed to reduce the power of a signal without appreciably distorting its waveform, thus making the input signal smaller.

Question 10

The ____ control is active only when both traces are being displayed at the same time.&#10;A) Add-Alt-Chop&#10;B) AC-GND-DC&#10;C) Auto-normal&#10;D) Int-Line-Ext

Accepted Answer

The Add-Alt-Chop control is specifically designed for use when both traces are being displayed simultaneously on an oscilloscope, allowing the user to switch between adding the signals, alternating between them, or chopping them for display.

Deck 3: Measuring Instruments