The energy given out or taken in as a result of a phase change
The energy needed to boil water
The energy needed to boil any liquid
The heat given out when steam condenses
What is the definition of Dew Point
The temperature at which water vapour condenses to form liquid water
The temperature at which water boils
The humidity at which water condenses to form liquid water
The humitity created by the boiling of water
Which of the lists below correctly identify the three methous of heat transfer
Conduction Convection Radiation
Condensation Convection Radiation
Conduction Convection Circulation
Convection Radiation Recirculation
What is sensible heat
Heat that can be measured
Heat that can be controlled
Heat generated by infrared radiation
Any form of heat below 100C
In contact drying, there are several restrictions to heat between the steam and the sheet itself. Which layer offers the greatest restriction?
The air
The water on the inside of the drying cyllinder
The sheet itself
The scale
What is the definition of Mass Transfer?
The tendancy of one component of a mixture to move from a region of high concentration to a region of low concentration
The tendancy of one component of a mixture to move from a region of low concentration to a region of high concentration
The way water moves from the sheet and into the air
The movement of molecoles from one place to another
There are FOUR restrictions to mass transfer, two of them are Air Velocity and Air Temperature. What are the other two?
Humidity Dryer temperature
Humidity Wet bulb temperature
Dry bulb temperature Wet bulb temperature
Dryer temperature Dryer fabric permeability
One of the problems of two tier drying systems is ventilation. This is due to the formation of.......
Pockets
Socks
PV systems
doughnuts
The main disadvantage of the single tier drying system is.......
only one side of the sheet is dried at a time
the sheet has to be supported
draughs
additional wrap around the drying cyllinder
In which phase of the drying cycle does the sheet undergo simultanious heating and cooling?
Phase 3
Phase 2
Phase 1
Phase 4
In which phase of the drying cycle does the sheet undergo only cooling?
Phase 4
Phase 3
Phase 2
Phase 1
In the three stages of drying, what name is given to the point at which the curves diverge?
Critical point
Boiling point
Immobilisation point
Divergence point
What do we use to remove condensate and blow through steam from drying cyllinders
A syphon
A flange
A venturi
A thermo compressor
The most common material of construction for dryer fabrics is...
polyester monofilament
polyester miltifilament
ryton
nomex
The brittleness of old dryer fabrics is due to.......
hydraulic chain cleavage
biscuiting
reaction with wet strength resins
wear by filler particles
Which of the following describes a cascade steam system
The dryer section is divided into three banks, and the steam exiting from the first bank is fed to the second, and the steam from the second bank is fed to the third
Live steam is fed into all cyllinders equally
The dryer section is divided into three banks, and each bank has its own steam control
The dryer section is divided into three banks, and the steam exiting from the first bank is mixed with live steam and fed to the second, and the steam from the second bank is mixed with live steam and fed to the third
The device used to mix blow through steam and live steam is called a .....
Thermocompressor
Compressor
Jet Mill
Thermo Mill
Cockling and dusting are caused because .....
the first drying cyllinder is too hot
the first drying cyllinder is too cold
the last drying cyllinder is too hot
the last drying cyllinder is too cold
Which of the following statements relating to the CD shrinkage profile is true?
Single tier drying systems give a smaller flatter profile
Single tier drying systems give a higher flatter profile
Single tier drying systems give a smaller but more curved profile
Single tier drying systems give a higher and more curved profile