Work on the topic

Electronic Device Layers

Electronic devices today are incredibly complex. Normally, they are designed with multiple layers. These layers are
stacked on top of one another. For example, the first layer is the screen. Next comes a metal shield. Under
that layer, there may be a circuit board. Another layer of some sort is usually underneath the circuit board. Finally.
the last layer may contain the battery compartment. With so many layers, it is difficult to repair devices.
Technicians must take the layers off very precisely. They should also draw the device schematic on a piece of
drawing paper. Otherwise, they might lose track of where all the parts go. In almost all devices, screws keep the layers together. To
fix a device, some screws must be taken out. Technicians can remove any screw twisted into a fixed part of the
device. They should not remove screws in nuts, though. It is too easy to lose nuts somewhere inside the device.
Unfortunately, technicians won't always know which screws are which. Some devices have arrows indicating the screws that can be removed. However, this isn't an
industry standard. Most of the time, technicians must just start unscrewing screws counterclockwise. If a screw wiggles, it's in a nut.

1. Read the textbook excerpt.
Then, choose the correct answers.
1 What is the purpose of the passage?
A to persuade readers to buy devices with layers
B to inform readers how to use nuts and screws
C to explain layers in electronics devices
D to compare different layers in devices

2 What screws should technicians remove?
A screws twisted into nuts
B screws twisted into fixed objects
C all screws in the device
D screws not marked with arrows

3 What is NOT mentioned in the passage?
A one layer of a device is usually a metal shield
B technicians should list a layer's parts on scrap paper
C arrows next to screws are not an industry standard
D unscrew screws by twisting them clockwise

2. Place the words and phrases from the word bank under the correct heading.

3. Read the sentence and choose the correct word
1 The next layer / metal shield is the curcuit board.
2 Just lose track / stack those discs in the corner.
3 He wrote his phone number on scrap paper / nut.
4 Don't stack / lose track of that wire.
5 The device meets industry standards / battery compartments.
6 Please do the job very counterclockwise / precisely.