Momentum Transfer

Question 1

The viscosity of a gas

a. dec with inc in temp
b. inc with the inc in temp
c. is independent of temp
d. is independent of pressure for very high pressure identities

Answer 1

b. inc with the inc in temp

• bc pag ininit yung gas, magcocollide mga molecules, resulting to friction kaya bumabagal ang flow

Question 2

Shear stress is __________ proportional to Force and viscosity

a. directly
b. inversely

Answer 2

a. directly

Question 3

The dimensionless number that characterizes the flows of fluid in a conduit

Answer 3

Reynolds number

Question 4

Re < 2100

Answer 4

Laminar

Question 5

Re > 400

Answer 5

Turbulent

Question 6

Smooth stream line for fluid flow

Answer 6

Laminar flow

Question 7

Chaotic movement of fluid flow

Answer 7

Turbulent flow

Question 8

Formed vortex in turbulent flow

Answer 8

eddies

Question 9

ratio of inertial force to gravity force

Answer 9

Froude number (can be found in table 6-9)

Question 10

Which valve is used accurately to regulate the flow of liquids and gases at low flow rates

Answer 10

needle valve

Question 11

Mach number < 1, flow is

Answer 11

Subsonic

Question 12

Mach number = 1, flow is

Answer 12

Sonic

Question 13

Mach number > 1, flow is

Answer 13

Supersonic

Question 14

Why is there no vapor in the pump

Answer 14

cavitation

Question 15

Which of the following is not true

a. A pump will operate safely it its NPSH is greater than zero
b. Fans and blowers are used tk transport gases
c. Pumps and blowers increase the mechanical energy of the fluid
d. The power loss due to friction in a venturi meter is greater than in an orifice meter

Answer 15

d. bc of vena contrata (?)

Question 16

How many schedule number for pipe

Answer 16

10

Question 17

An important devuce for measuring pressure differences

Answer 17

Manometer

Question 18

Type of manometer that is often used for measurement of small pressure differentials accurately

Answer 18

Inclined Manometer

Question 19

Type of manometer where the the end of the U tube is connected to two large chambers.

Answer 19

Differential Manometer/Multiplying Gauge

Question 20

standard atmosphere at sea level

Answer 20

1 atm

Question 21

device used to measure air pressure in a certain atmosphere

Answer 21

baromter

Question 22

He wrote “panta rhei” translated as “everything flows”

Answer 22

Heraclitus

Question 23

resistance of a fluid to flow

Answer 23

viscosity

Liquid viscosity decrease when temp is raised

gas viscosity increases with temperature

Question 24

Toothpaste, jellies, paints are examples of

Bingham fluids
Pseudoplastic fluids
Dilatany fluids

Answer 24

Bingham

Question 25

blood is an example of

Bingham fluids
Pseudoplastic fluids
Dilatany fluids

Answer 25

Pseudoplastic

Question 26

Polymer solution is an example of

Bingham fluids
Pseudoplastic fluids
Dilatany fluids

Answer 26

Pseudoplastic

Question 27

Space where fluid and pipe surface separates

Answer 27

boundary layer

Question 28

a motor that converts mechanical energy to electrical energy

Answer 28

Dynamo

Question 29

Which statement is not true

a. Potential flow is a flow of compressible fluids with no shear
b. rotameters are variable headed meters
c. There are 8 schedule numbers for standard pipes
d. Roughness has no appreciable effect on the friction factor when flow is laminar

Answer 29

c.