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324 Aircraft Systems > Block Exam 4/26/17 > Flashcards

Block Exam 4/26/17 Flashcards

1
Q

What are the 2 basic types of batteries? What makes them different?

A
  1. Primary - NOT rechargeable

2. Secondary - Rechargeable

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2
Q

What is Rated Capacity of a battery and how does this compare to Actual Capacity?

A

Rated Capacity - Ability of the battery when it is new

Actual Capacity - Reduced performance after it has been used and wares out

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3
Q

Watts = ____ x ____

A

Watts = Amps x Volts

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4
Q

What are the 2 types of electricity?

A
  1. Static

2. Current (AC and DC)

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5
Q

How many watts equals 1 HP?

A

746 watts

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6
Q

What are the 2 types of current?

A
  1. Alternating Current

2. Direct Current

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7
Q

What are the 3 ways to manipulate voltage?

A
  1. Strength of Magnets
  2. Speed of Movement
  3. Number of Magnets
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8
Q

What is the purpose of a busbar?

A
  • Convenience for terminating wires

- Circuit breakers are mounted directly on, and many can be turned on with 1 switch

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9
Q

How many electrons are in 1 Coulomb?

A

6.28 x 10 to the 18th power

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10
Q

What are the 2 ways AC current generated by an Alternator can be converted to DC?

A
  • TRU (TransRectifying Unit)

- Converter

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11
Q

What is the function of the diodes in an Alternator?

A
  • They only allow E to flow ONE WAY!

- In a TRU connected to an Alternator, they are essential in converting AC to DC

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12
Q

What does increasing the electrical load on an alternator do to engine performance?

A

It will DECREASE engine performance

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13
Q

What are Relays and a Solenoids? What is the main difference between the two?

A

Both are electromagnet switches.
Relay - used in smaller current circuits
Solenoid - used for high current circuits

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14
Q

What does the Power Pack do for the hydraulic system?

A

Houses the electrically driven fuel pump, valves other equipment that provides pressure to the hydraulic systems

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15
Q

What is a Thermal Runaway?

A

When a battery’s temperature increases causing uncontrolled flow of E and acceptance of ALL electrical current. The batter can become so hot that it melts or explodes!

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16
Q

What purpose does the rectifier serve?

A

Converts AC to DC

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17
Q

If you lost your alternator, how long will you be able to run the battery on the Cessna?

A
  • Generally the Master can last for 1 hour and the STBY Batt can last for 30 mins.
  • Stretch it by reducing electrical load
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18
Q

Draw and label the electric system symbols for a fuse, circuit breaker, and solenoid switch.

A

–o~o– (Fuse)
o__o (Circuit Breaker)
-[@@@]- (Solenoid Switch)

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19
Q

The battery in a Hawk is:

20
Q

What is the difference between an Ammeter and a Load Meter?

A

Ammeter - measured current going through a circuit

Load Meter - measures the total load on a circuit

21
Q

What happens when a short circuit occurs?

A
  • Uncontrolled flow of E which heats up the wires and causes fires
  • An electrical path is created that allows the circuit to bypass the load
22
Q

On a Hawk, the starter solenoid closes if:

A

The battery solenoid is closed and Start is selected on the ignition switch

23
Q

What is Pascal’s Law? What is the equation?

A
  • Pressure in an enclosed container is transmitted equally and undiminished to all parts of the container and acts at right angles to the enclosing walls
  • Pressure = Force x Area
24
Q

The Pressure exerted by a column of liquid is dependent on its _____ and _____

A

HEIGHT and DENSITY (volume does not make a affect pressure)

25
What are 2 types of pumps generally found in hydraulic systems?
1. Hand pumps (Single and Double Action) | 2. Power pumps (Constant and Variable Displacement)
26
Using Pascal's Law, if F = 100lbs over an area of 10 square inches, what is the pressure and how much weight can be moved with a piston of 50 square inches?
Force = Pressure x Area 100/10 = 10psi 10psi x 50 = 500lbs Intended pressure will be 10psi, and you will be able to lift 500lbs!
27
Is hydraulic fluid viscous or non-viscous?
Viscous! | The larger the molecules of the fluid, the thicker it is!
28
What is the function of a Hydraulic Actuator?
- Converts hydraulic pressure into mechanical pressure | - Moves retractable gear up and down when you get hydraulic pressure
29
Hydraulic controls operate on what physical property of liquids?
INcompressabiity!
30
What kind of hydraulic fluid is in out C172s? What color is it?
MIL-H-5606 | It is Red!
31
When using a hang pump to lower an a/c's landing gear, what would be the advantage of having a double-action pump over a single-action pump?
A double-action pumps in each direction, so it will take less pumps to move the gear
32
What is the purpose of a squat switch?
Senses when the gear is compressed and prevents it from retracting when the plane is on the ground!
33
What is the purpose of the Accumulator in a hydraulic system?
Maintains pressure on the system at all times
34
What does the emergency gear extension control do with regard to the hydraulic system in a free-fall type emergency gear release?
Allows the pressure to equalize throughout the system (allowing the gear to free-fall w/o a working pump)
35
What would be an indication that your hydraulic pump is cycling on and off in order to keep the gear fully retracted?
- Seeing occasional spikes in amperage | - Hearing the pump
36
What turns off the hydraulic pump when the gear is coming up?
The pressure switch
37
It is a rainy day. You bring the gear down and one of the lights fails to indicate. It isn't a bulb, and the emergency extension fails to rectify the problem. You do a tower flyby and they report your gear is down. What is the likely malfunction?
Water could have gotten in and created a short circuit that would prevent down and lock indication from coming on
38
What is the difference between anti-ice and de-ice?
Anti-ice is meant to PREVENT ice accumulation, De-ice is meant to REMOVE ice after it is formed.
39
What is Ohm's Law?
Volts = Current x Resistance
40
Stationary magnets and a rotating coil/conductor can be found in:
A Generator!
41
Stationary coil/conductor and rotating magnets can be found in:
An Alternator! (SC + RM = A) SCR(A)M
42
What 3 things affect the output of the alternator?
1. # of conductors 2. RPM 3. Strength of magnetic field
43
What type of current do Slip Rings produce?
Alternating Current! (AC)
44
____ rings rotate along with the coil
SLIP rings
45
Generators are most common in turbine aircraft because they are:
Simpler and easier to control than Alternators

324 Aircraft Systems (3 decks)

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