11 Engineering Revision Unit 2

Phase diagrams

100

What does L stand for in a phase diagram

Liquid

200

What does alpha represent in a phase diagram?

Solid phase

300

 What is the name used to describe the microscopic grains in an alloy

Microstructure

400

What does complete solid solubility mean?

Complete solid solubility means copper (Cu) and nickel (Ni) can dissolve completely in each other in the solid state

500

What is the formula for the reverse lever rule?

W_L=S/(R+S)

W_L=(C_∝-C_O)/(C_∝-C_L)

Electricity

100

What is the unit of electrical current?

Ampere

200

What is the unit of resistance?

Ohm

300

A circuit has a voltage of 12 V and resistance of 4 Ω. What is the current?

3 A

400

A 24 V supply produces a current of 2 A. What is the resistance of the circuit?

12 Ω

500

Two 6 Ω resistors are connected in series to a 24 V supply. What is the total resistance and current in the circuit?

12 Ω and 2 A

MA and VR

100

Mechanical advantage is defined as a measure of...

the force amplification achieved by using a tool or mechanical device

200

You exert an effort force of 697 N downward and resulting load force 93 N. What is the mechanical advantage?

0.13

300

A platform is 1.5 metres off the ground, and the ramp is 6.0 metres long. What is the MA of this ramp?

MA = 4

400

A lever has a velocity ratio of 4. If the load moves 0.25 m, how far does the effort move?

1 m

500

A machine has a mechanical advantage of 3.6 and a velocity ratio of 4.5. What is its efficiency?

80%

Biomedical/polymers

100

What is a prosthesis?

An artificial body part used to replace damaged structures

200

What is biocompatibility?

How well a material is accepted by the body without causing immune reaction.

300

What is an important material property in hip implants to prevent failure under load.

Tensile strength

400

Do natural polymers or synthetic polymers have a longer lifespan?

Synthetic

500

A hip implant must withstand repeated loading while remaining safe inside the human body. Which TWO properties are most important when selecting a material for a hip implant, and why?

High wear resistance to reduce material loss from friction, and high biocompatibility so the material does not cause an adverse response in the body.

McMillan lore

100

How many chickens does Ms McMillan have?

Three

200

What is Ms McMillan's favourite colour?

Green

300

What kind of engineer was Ms McMillan?

Mining engineer

400

What is Ms McMillan's favourite mineral?

Olivine

500

What NZ city was Ms McMillan born in?

Auckland