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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:

A

Lead-Acid

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
Q

What are 2 types of pumps generally found in hydraulic systems?

A
  1. Hand pumps (Single and Double Action)

2. Power pumps (Constant and Variable Displacement)

26
Q

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?

A

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
Q

Is hydraulic fluid viscous or non-viscous?

A

Viscous!

The larger the molecules of the fluid, the thicker it is!

28
Q

What is the function of a Hydraulic Actuator?

A
  • Converts hydraulic pressure into mechanical pressure

- Moves retractable gear up and down when you get hydraulic pressure

29
Q

Hydraulic controls operate on what physical property of liquids?

A

INcompressabiity!

30
Q

What kind of hydraulic fluid is in out C172s? What color is it?

A

MIL-H-5606

It is Red!

31
Q

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

A double-action pumps in each direction, so it will take less pumps to move the gear

32
Q

What is the purpose of a squat switch?

A

Senses when the gear is compressed and prevents it from retracting when the plane is on the ground!

33
Q

What is the purpose of the Accumulator in a hydraulic system?

A

Maintains pressure on the system at all times

34
Q

What does the emergency gear extension control do with regard to the hydraulic system in a free-fall type emergency gear release?

A

Allows the pressure to equalize throughout the system (allowing the gear to free-fall w/o a working pump)

35
Q

What would be an indication that your hydraulic pump is cycling on and off in order to keep the gear fully retracted?

A
  • Seeing occasional spikes in amperage

- Hearing the pump

36
Q

What turns off the hydraulic pump when the gear is coming up?

A

The pressure switch

37
Q

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?

A

Water could have gotten in and created a short circuit that would prevent down and lock indication from coming on

38
Q

What is the difference between anti-ice and de-ice?

A

Anti-ice is meant to PREVENT ice accumulation, De-ice is meant to REMOVE ice after it is formed.

39
Q

What is Ohm’s Law?

A

Volts = Current x Resistance

40
Q

Stationary magnets and a rotating coil/conductor can be found in:

A

A Generator!

41
Q

Stationary coil/conductor and rotating magnets can be found in:

A

An Alternator! (SC + RM = A) SCR(A)M

42
Q

What 3 things affect the output of the alternator?

A
  1. # of conductors
  2. RPM
  3. Strength of magnetic field
43
Q

What type of current do Slip Rings produce?

A

Alternating Current! (AC)

44
Q

____ rings rotate along with the coil

A

SLIP rings

45
Q

Generators are most common in turbine aircraft because they are:

A

Simpler and easier to control than Alternators

324 Aircraft Systems (3 decks)

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