Question 1

One of the first steps in design is ____.&#10;A) to complete the design&#10;B) to determine what is needed to do the job&#10;C) to select components&#10;D) to construct the circuit

Accepted Answer

Determining what is needed to do the job is one of the initial steps in the design process, as it helps in understanding the requirements and constraints of the project before moving forward with selecting components, constructing circuits, or completing the design.

Question 2

A ____ changes its resistance with a change of light.&#10;A) cad cell&#10;B) cam cell&#10;C) lock cell&#10;D) lead cell

Accepted Answer

A cad cell, or cadmium sulfide cell, changes its resistance based on the amount of light hitting its surface, making it a type of photoresistor.

Question 3

The cad cell produces a voltage in the presence of light.

Accepted Answer

False

Question 4

When a cad cell is in the presence of light, its resistance is high.

Accepted Answer

A cad cell, or cadmium sulfide cell, decreases its resistance when exposed to light, making its resistance low in the presence of light.

Question 5

When a solar cell that is running a light closes, the light is connected to the ____-volt AC power line.&#10;A) 60&#10;B) 90&#10;C) 120&#10;D) 180

Accepted Answer

In the United States, the standard voltage for homes and residential areas is 120 volts AC. Solar cells, when connected to an inverter to power AC devices, would typically be adapted to this standard voltage.

Question 6

When a cad cell is in darkness, its resistance decreases and current is permitted to flow to the base of the transistor.

Accepted Answer

When a cad cell (cadmium sulfide photoresistor) is in darkness, its resistance increases, not decreases, which limits the amount of current flowing through it.

Question 7

The operational amplifier can do the conversion from the cad cell analog operation to a digital action when it is used as a ____.&#10;A) level inverter&#10;B) level detector&#10;C) level amplifier&#10;D) level controller

Accepted Answer

An operational amplifier can be used as a level detector to convert from analog operation to digital action by detecting when the input signal crosses a certain threshold level, thus creating a digital output signal indicating whether the input is above or below that threshold.

Question 8

A device is required that can convert the analog operation of the cad cell into a digital action.

Accepted Answer

A cad cell, or cadmium sulfide cell, is a type of photoresistor or light-dependent resistor (LDR) that changes resistance based on light intensity. To interface this analog behavior (change in resistance based on light) with digital electronics (which require digital signals), a device that can convert these analog changes into digital actions (such as an analog-to-digital converter, ADC) is required. This allows digital systems to process and react to variations in light intensity detected by the cad cell.

Question 9

A ____ circuit is used to turn on a light when darkness comes, or activate a control component when a light is either present or absent.&#10;A) thermocouple&#10;B) thermistor&#10;C) photocouple&#10;D) photodetector

Accepted Answer

A photodetector circuit is used to detect light and can be employed to turn on a light in the absence of light (darkness) or activate a control component based on the presence or absence of light.

Question 10

When a cad cell is exposed to a bright light, its resistance drops to a low value.

Accepted Answer

A cad cell, or cadmium sulfide cell, is a type of photoresistor or light-dependent resistor (LDR), which decreases its resistance when exposed to light, particularly bright light.

Deck 45: Design of Circuit 1 Photodetector