Engineering Units

Question 1

Secondary Dimensions

Answer 1

Combination of the primary dimensions

• Volume, Velocity

Question 2

Primary Dimensions

Answer 2

Express in physical entity

• Length, Time, Temperature, Mass

Question 3

Imperial System (english unit)

Answer 3

Centimeter, grams, seconds

Question 4

Metric System

Answer 4

Meter, kilogram, seconds

Question 5

A

Answer 5

Ampere: current

Question 6

K

Answer 6

Kelvin: thermodynamic temperature

Question 7

Mole

Answer 7

the amount of substance of a system

Question 8

cd

Answer 8

Candela: luminous intensity

Question 9

N

Answer 9

Newton: acceleration of kg mass

(m/s²)

Question 10

J

Answer 10

Joule: work done due to a force of 1 N and displacement of1m in the direction of the force

Question 11

W

Answer 11

Watt: work done per time

(J/s)

Question 12

V

Answer 12

Volts: electrical potential between two point

(W/A)

Question 13

Work (mechanical energy)

Answer 13

Force x Distance (Nm)(J)

Question 14

Potential Energy

Answer 14

The energy required by position (height) mass and height also express in J (mgh)

Question 15

Kinetic Energy

Answer 15

The energy acquired by motion (1/2mv²)

Question 16

Heat (thermal energy)

Answer 16

One joule of energy that requires to raise the temperature of 1 kg of water by 1°C

Question 17

Sensible Heat

Answer 17

The heat absorbed or transmitted by a substance during a change of temperature which is not accompanied by a change of state

Question 18

Latent Heat

Answer 18

The energy that when added or removed from a body results in a change of state

*Vaporization
*Fusion

Question 19

Enthalpy

Answer 19

Total energy content of a body kJ/kg

Question 20

Specific Heat Capacity (Cp)

Answer 20

The amount of energy required to raise the temperature of a unit mass of material by a unit of temperature difference at constant pressure or volume

Question 21

Thermal Conductivity (k)

Answer 21

The quantity of heat that will be conducted per unit time across a unit thickness of a material if a unit temperature gradient exist across the thickness

(W/m °C)

Question 22

Thermal Diffusivity

Answer 22

The ratio of thermal conductivity to heat capacity and density (m²/s)

Question 23

Heat Transfer Coefficient

Answer 23

The quantity of heat transferred across a unit surface area to a fluid when a unit temperature gradient exists between the surfaces and the fluid (m/(m² °C))

Question 24

Dynamic Viscosity

Answer 24

Expressed as the resistance to a fluid to flow (Pa.s)

Question 25

Porosity

Answer 25

= 1 - (bulk density/solid density)

Question 26

Interparticle Porosity

Answer 26

= 1 - (bulk density/particle density)