Self-tests For Last Two Modules Flashcards

1
Q

In a deliquescent dryer, which way does the flow normally go?

A

upward

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2
Q

What is relative humidity?

A

A comparison of the amount of water a sample of air holds to the maximum amount it could hold if saturated.

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3
Q

Dew point is the temperature to which air must be lowered in order for _________________

A

condensation of water vapour to begin

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4
Q

Regenerative dryers often use a portion of the dried air for regeneration of ________________

A

the saturated desiccant bed

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5
Q

What are desiccants often made of?

A
  • activated alumina
  • granular and bead type silica gel
  • molecular sieves
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6
Q

True or False: There are forms of energy other than electricity that can be very harmful and equipment must be locked out to prevent injury

A

True

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7
Q

As a sample of air that is partially saturated cools, relative humidity _________

A

rises

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8
Q

True or False: It takes more energy to change the phase of a volume of liquid to a vapour without a change in temperature than it does to increase its temperature 1* without any phase change.

A

True. It takes 1BTU to increase the temperature but 970 BTUs to change its phase from liquid to vapour

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9
Q

Name the 4 categories of dryers

A
  1. Adsorption
  2. Absorption
  3. Refrigeration
  4. Mechanical
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10
Q

When working on a dryer, you must _____________ and _______________ the complete system, as well as lock out the compressor whenever possible.

A

When working on a dryer, you must depressurize and isolate the complete system, as well as lock out the compressor whenever possible.

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11
Q

The energy of compressed air in the lines can cause severe whiplash when one end of a hose is let free. This can be overcome with an ________________ that stops flow through the line if excessive flow occurs

A

excessive flow valve

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12
Q

______________ cylinders must be let down or mechanically blocked to prevent movement before performing any work on or around them

A

vertical

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13
Q

Piping should be sized to minimize __________________ by being large enough with as few bends as possible

A

pressure drop

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14
Q

The purpose of a __________ in a pneumatic system is to lower the dew point so that it does not cause problems in the system

A

dryer

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15
Q

The _____________ can be used anywhere in the system that moisture might fall out

A

cyclone separator

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16
Q

____________________ are used to store compressed air to take up fluctuations in demand and allow the system pressure to vary within reasonable limits

A

Air recievers

17
Q

The purpose of the _____________ is to bleed off excess system pressure before it becomes too extreme

A

Safety relief valve

18
Q

Leaks waste energy (from compression) which increases expenses while reducing ____________________________

A

the performance of air tools and equipment

19
Q

Most compressed air systems run for long distances. This allows the air to cool below its _____________, which causes moisture to fall out of the air stream

A

Dew Point

20
Q

Flow control valves control the ____________ and therefore the speed of the actuator

A

volume

21
Q

Pilot operation refers to valves that are operated with _____________

A

air pressure

22
Q

What does internally piloted mean?

A

The air pressure within the valve is used to perform the shifting function

23
Q

The 3/2 valve can be used if the air needs to be release when __________________

A

the valve is closed

24
Q

A typical application of a 3/2 valve is the operation of a __________________ acting cylinder

A

single

25
Q

A ____________ acting cylinder is a common application of a 4/2 valve

A

double

26
Q

The _________________ is used to automatically select the higher of two pressure sources to supply a pneumatic signal

A

shuttle valve

27
Q

What is the first item to check in a malfunctioning system?

A

Whether there is a supply of air at sufficient flow and pressure