Free Printable DesEng Practice 3

1.

An example of a 'wastage' method is...

a)

Drilling a hole in a block of wood

b)

Bending a sheet of metal with the 3-in-1

c)

Fused Deposition Modelling with a 3D printer

d)

Welding two plates of steel together

2.

$\times10^6$ is...

a)

Kilo

b)

Mega

c)

Giga

d)

Terra

e)

Peta

3.

Which of these will provide the potential difference between ground and an analogue input pin on a PIC?

a)

$V_2=V_t\times\left(\frac{R_2}{R_1+R_2}\right)$

b)

$V_1=V_t\times\left(\frac{R_1}{R_1+R_2}\right)$

c)

$V_2=V_t\times\left(\frac{R_1}{R_1+R_2}\right)$

d)

$V_1=V_t\times\left(\frac{R_2}{R_1+R_2}\right)$

4.

When a metal rod is stretched, usually one section of the sample will thin in the middle prior to the sample failing. This is referred to as...

a)

Necking

b)

Thinning

c)

Smiling

d)

Ultimate tensile strength

5.

Which of these would be an application for PWM?

a)

Setting up a monostable circuit

b)

Protecting a solenoid from back-EMF

c)

Dimming an LED

d)

Reducing the ripple effect on an AC power supply

6.

An LED is connected to a PIC output pin. What would be needed to replace this with a 230V (AC) signal lamp?

a)

Opto-Isolator

b)

SPST relay

c)

MOSFET

d)

NPN Transistor

e)

PNP Transistor

7.

A resistor...

a)

Reduces the flow of current

b)

Reduces the voltage

c)

Reduces power

d)

Creates back-EMF

8.

An example of Quality Assurance would be

a)

Installing a fresh drill bit prior to drilling out a PCB

b)

Checking that no holes have been missed after drilling a PCB

c)

Wearing goggles while drilling the holes in a PCB

9.

An example of Quality Control would be

a)

Installing a fresh drill bit prior to drilling out a PCB

b)

Checking that no holes have been missed after drilling a PCB

c)

Wearing goggles while drilling the holes in a PCB

10.

An advantage of using a planetary (epicyclic) gear system is...

a)

Reduced complexity to design

b)

High gear ratios can be produced in a small space

c)

Reduced lubrication requirements

d)

Easily accessible for maintenance

DesEng Practice 3

Total questions: 10

Worksheet time: 7mins

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