review EE2 ME

There is always some friction when two .......... objects move relative to one another.

• separating

• touching

• vibrating

• distancing

Friction can be reduced by ……………… and by good design.

• reinforcing

• machinery

• lubrication

• overengineering

MEMS concerns tiny, three-dimensional systems ranging from 1 to 10,000 ……………… in size.

• millimeters

• microns

• nanometers

• centimeters

Compared with MEMS, nanotechnology has even smaller scales, down to a ……………… of a meter.

• thousandth

• hundredth

• billionth

• millionth

Conductivity, strength and viscosity can be modified if we can work at scales of less than 100 ……………….

• micrometers

• millimeters

• centimeters

• nanometers

……………… in cars are triggered by an accelerometer which is often a MEMS device.

• safety belts

• alarm systems

• braking systems

• airbags

An engine which combines an internal combustion engine with an electric motor is called a ……………….

• hybrid

• hydrogen

• combination

• modification

A ……………… is usually used as the direct power source for electrical systems.

• motor

• generator

• battery

• machinery

……………… energy sources, such as wind, tidal and solar power, have a big part to play.

• earthly

• renewable

• rechargeable

• fossil

well-constructed water supply and ………… systems can significantly reduce life-threatening diseases.

• building

• sewage

• storage

• sewerage