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Module 11B > 11.16 Pneumatic/ Vacuum MCQ's > Flashcards

11.16 Pneumatic/ Vacuum MCQ's Flashcards

1
Q

When the moisture separator is purged in a pneumatic system, it dumps.
Option A. just the moisture trap.
Option B. the whole system.
Option C. the system between compressor and regulator valve.

A

Correct Answer is. just the moisture trap.

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2
Q

The pneumatic system pump is a.
Option A. centrifugal type.
Option B. rotor vane type.
Option C. piston type.

A

Correct Answer is. piston type.

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3
Q

In a pneumatic system, the maintainer valve will be fitted in supply lines to.
Option A. essential equipment.
Option B. all equipment.
Option C. non-essential equipment.

A

Correct Answer is. non-essential equipment.
Explanation. Maintainer valves work in same way as those in hydraulic systems (hence the reference). Although they protect the flow to the essential systems, they do so by being situated in the non-essential lines, and closing off if the pressure drops.

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4
Q

High pressure pneumatic source is a.
Option A. reciprocating pump.
Option B. centrifugal Compressor.
Option C. butterfly pump.

A

Correct Answer is. reciprocating pump.

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5
Q

High pressure pneumatic pump is a.
Option A. reciprocating pump.
Option B. spur gear.
Option C. butterfly pump.

A

Correct Answer is. reciprocating pump.

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6
Q

If the pneumatic water drain trap is left open for a long time it will drain.
Option A. between the compressor and the PRV.
Option B. just the moisture trap.
Option C. all the system.

A

Correct Answer is. between the compressor and the PRV.

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7
Q

On a high pressure pneumatic system, if the drain plug for oil and water is left open for long periods of time, the system would.
Option A. lose pressure from the compressor side only.
Option B. lose pneumatic pressure partially.
Option C. lose all pressure.

A

Correct Answer is. lose pressure from the compressor side only.

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8
Q

Two compressors driven by separate engines use.
Option A. Interconnected to share loads.
Option B. NRVs to prevent compressors driving each other.
Option C. PRVs.

A

Correct Answer is. NRVs to prevent compressors driving each other.

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9
Q

What is important about the air entering a dry air pump?.
Option A. It must be filtered.
Option B. It must be pressure controlled.
Option C. It must be temperature controlled.

A

Correct Answer is. It must be filtered.

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10
Q

What type of compressor is used on a pneumatic system?.
Option A. Rotary vane type.
Option B. Spur gear type.
Option C. Positive displacement type.

A

Correct Answer is. Positive displacement type.

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11
Q

The purpose of an oil and water trap in a pneumatic system is to:

Extract water from the pump lubricating system
Extract liquid from the air.
Lubricate the oil pump

A

Extract liquid from the air.

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12
Q

The two types of engine driven pumps are called:

Wet and dry lubricated pumps
Pressure suction pumps
Vacuum and venturi pumps

A

Wet and dry lubricated pumps

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13
Q

The disadvantage of a vacuum venturi system over an engine driven air pump, to drive aircraft gyro instruments:

More air cleaning is required for a vacuum venturi system
The aircraft must be moving forward at a certain speed for a vacuum to be created.
Engine driven air pumps can be operated at lower altitude

A

The aircraft must be moving forward at a certain speed for a vacuum to be created.

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14
Q

Wet lubricated air pumps:

Require lubrication
Have self-contained lubrication
Can only be lubricated on the ground

A

Require lubrication

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15
Q

A pneumatic gyro instrument system can be operated:

Only by a pressure pump
By a venturi vacuum pump
By suction pump only

A

By a venturi vacuum pump

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16
Q

An overheat detector in the wing leading edge area signals an overheat state. This indicates

the bleed air system is to hot
there is an external leak in the ducting
either 1) or 2) is correct

A

there is an external leak in the ducting

17
Q

What would be the normal values for pressure and temperature in a low pressure pneumatic system:

15 psi and 50 c
25 psi and 100c
45 psi and 200c

A

45 psi and 200c

18
Q

What is the fail safe position for a main bleed valve/ pneumatic system main valve is:

Open
closed
last selected

A

Open

19
Q

What precautions should be observed when using air from a ground cart:

aircraft must have electrical power
fire extinguisher on hand
APU circuit breakers should be pulled

A

aircraft must have electrical power

20
Q

Pressure sensing of a pneumatic system for the purposes of pressure control is obtained from:

up stream of the bleed valve
downstream of the bleed valve
downstream of the pack valve

A

downstream of the bleed valve

21
Q

The spill valve of a “blower” (compressor) air conditioning system serves what purpose:

At high altitudes it opens to produce more air
At low altitudes it opens to produce more air
It modulates depending on altitude, closing at higher altitudes

A

It modulates depending on altitude, closing at higher altitudes

22
Q

Where is the silencer located in a “blower” air conditioning system?

At the inlet of the blower
At the outlet of the blower.
At the inlet to the cabin

A

At the outlet of the blower.

23
Q

Pneumatic rain removal systems

use engine bleed air at high velocity to remove water droplets from windscreen.
use a pneumatic motor to drive windscreen wipers
are not permitted on large transport aircraft

A

use engine bleed air at high velocity to remove water droplets from windscreen.

24
Q

A pneumatic pressure indicator takes its indications from

compressor inlet
compressor outlet
reservoir

A

reservoir.

25
Q

What is important about the air entering a dry air pump

must be filtered.
must be pressure controlled
must be temperature controlled

A

must be filtered.

26
Q

On a high pressure pneumatic system, if the drain plug for oil and water is left open for long periods of time, the system would

lose all pressure
lose pneumatic pressure partially
lose pressure from the compressor side only

A

lose pressure from the compressor side only

27
Q

Vacuum Dry air pumps are lubricated by:

the carbon in there slides
oil in the air
grease

A

the carbon in there slides

28
Q

Actuators in pneumatic systems:

are not normally damped as the air is a buffer
do not needing damping as they are slow
require damping as they are violent in operation.

A

require damping as they are violent in operation.

29
Q

The APU low pressure bleed is utilised by:

given it a higher priority than the engine bleed.
given it a lower priority than engine bleed
the pilot decides which to use

A

given it a higher priority than the engine bleed.

30
Q

The low pressure pneumatic ground bleed air connector is a quick release:

1”
8”
3”

A

3”

31
Q

A pneumatic maintainer valves purpose:

is to maintain pressure to the reservoir
is to maintain pressure to essential systems
is to maintain pressure to the accumulator

A

is to maintain pressure to essential systems

32
Q

Which of the following units on a high pressure pneumatic system offloads the compressor to control air pressure:

Pressure Regulator valve
Pressure maintainer valve
Pressure relief valve

A

Pressure Regulator valve

33
Q

What action does the spring inside a pressure reducing valve take in order to increase the pressure on the lower pressure service side of the valve:

The spring compresses to close the valve more, trapping air downstream.
The spring is not involved in controlling the pressure, it is for shutoff only.
The spring extends to open the valve more, admitting more air.

A

The spring extends to open the valve more, admitting more air.

34
Q

What action does the bellows take in order to regulate the pressure in a pressure reducing valve of a pneumatic system:

a) The bellows modulates the against the spring to close the inlet valve plunger.
b) the bellows modulates against the spring to open the inlet valve plunger
c) the bellows modulates, directly releasing the pressure

A

a) The bellows modulates the against the spring to close the inlet valve plunger.

Module 11B (42 decks)

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