Preliminary Engineering Studies Revision Quiz

What are the common electrical safety devices?

• Rectifiers, fuses, capacitors

• Diodes, capacitors, residual current devices

• Earth wires, fuses, double insulated appliances

• Resistors, circuit breakers, residual current devices

What does collaborative work practices refer to in engineering?

• Working as a team in projects to produce desirable outcomes

• Helping tradespeople to achieve high standards of workmanship

• Engineers directing workers to do as they are instructed in the plans

• Engineers working with financial controllers to keep the project within budget

A metal rod Ø10 mm and 0.250 m long, extends 0.1 mm when subjected to a 10 kN tensile force. What is the strain?

Which best describes why work hardening occurs in metals during deformation?

• An increase in grain boundaries by nucleation

• Production of crystallites due to a build up of dislocations at alloy atoms

• Production of more slip planes due to an increase in dislocations

• A reduction of slip planes due to a build up of dislocations at grain boundaries

A lever, pivoting at A, has a 40 kN load force acting at 45° as shown. What is the effort force required, acting at F, for the lever to maintain equilibrium?

• 86.7 kN

• 47.1 kN

• 61.3 kN

• 1.5 kN

Match the following

• 3rd Order Lever

• 
• 1st Order Lever

• 
• 2nd Order Lever

• 

Identify the main components of the injection molding machine.

a

b

c

d

e

f

Injection Unit

Heater Bands

Screw

Nozzle

Mould

Hopper

Organize these options into the right categories

Groups:

(a) Thermosoftening Polymers

,

(b) Thermosetting Polymers

• Polyester Resin

• Melamine Formaldehyde

• ABS

• HDPE

• Epoxy

• PVC

• Polypropylene

• Acrylic

​ FULL ANNEALING:

Heat the material ​ (a)   the Upper Critical Temperature.

Allow it to soak at this temperature.

Cool in ​ (b)   .

• below
• to
• furnace
• still air
• water
• above

What is the primary reason for using heat treatment in metals?

• To increase electrical conductivity

• To improve mechanical properties

• To reduce weight

• To enhance corrosion resistance