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Quiz 3
NavSci
16
Other
Undergraduate 3
11/29/2011

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Term
pressure =
Definition
force/area
Term
Accumulators
Definition
Holds system under pressure (w/out contin. pump)
Provides hydraulics when pump off/lost
Compensates for leakage/makeup volume
Types: piston, bladder, & direct contact
Term
Accumulator Types
Definition
Piston - Most common

Bladder
- Gun mounts
- Steering systems

Direct contact -Least common
Term
ohm's law
Definition
V =IR
Term
power in a circuit =
Definition
P = VI
Term
Resistors in Series
Definition
RT = R1 + R2 + R3 + . . .
Term
Resistors in Parallel
Definition
1/RT = 1/R1 + 1/R2 + 1/R3 + . . .
Term
Kirchhoff’s Current Law
Definition
Currents into a node sum to zero OR
Current entering a junction is equivalent to the current leaving a junction
Term
Kirchhoff’s Voltage Law (KVL)
Definition
Voltages around a CLOSED loop sum to zero
Term
Lead-acid Battery
Definition
Wet-cell battery
charged by forcibly changing the direction of electrical current
Term
Uses of Refrigeration
Definition
cooling food & cargo
Cooling electronics and equipment
Cooling of magazines
Air conditioning
Term
Refrigeration Cycle components
Definition
Refrigerant
Chiller
Compressor
Condenser
Reciever
Thermostatic expansion valve
Term
Refrigerant
Definition
Commonly use FREON

High latent heat of vaporization
Chemical stability
Readily available
Low cost
Term
Evaporator/Chiller
Definition
Located in space to be refrigerated


Absorbs heat from surroundings and vaporizes
Slightly superheated
Term
Compressor
Definition
creates more pressure
Term
CENTER OF GRAVITY
Definition
the theoretical point through which the summation of all the weights act through location does not change
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