NEW
Font size
WorksheetsELEC 269 Quiz 3 Review
Total questions: 50
Worksheet time: 25mins
What does SPDT mean?
Single Ply Double Twist
Singular Pole Dual Throw
Single Pole Double Throw
Swift Piezo Dielectric Throw
What type of switch is this?
Single Pole Single Throw
Single Pole Double Throw
Double Throw Single Pole
Double Throw Double Pole
What type of switch is this?
Single Pole Single Throw
Single Pole Double Throw
Double Pole Single Throw
Double Pole Double Throw
What type of switch is this?
Single Pole Single Throw
Single Pole Double Throw
Double Pole Single Throw
Double Pole Double Throw
What type of switch is this?
Single Pole Single Throw
Single Pole Double Throw
Double Pole Single Throw
Double Pole Double Throw
What does DPST-NO mean?
The switch is normally closed
The switch is never open
The switch is normally open
The switch has two positions
Which switch is -NO?
A
B
both
neither
Which switch is -NC?
A
B
both
neither
When we actuate a switch what might be an issue?
Initial current draw of some loads
Arcing
Stored magnetic energy in coils
All of these
How do we protect the switch from these?
Use a switch rated for the circuit's current
Use a switch rated for double the circuit's current
Use a switch with adjusted with a derating factor
Use a switch with an inductive ceramic isolator
If we have a 28V 2A system and we're installing a heater, what switch rating should we choose?
2A
4A
8A
28V
What component is this?
SPST-NC
SPDT-NO
Relay
Solenoid
It takes a bit of current to make the coil a strong enough magnet to overcome spring tension and move the switch. What do we call this?
Derating factor
Forward bias
Pickup current
All of these
When the coil is energized, where will the current flow?
from A to B
from A to C
from B to C
none of these
What's the difference between a relay and a solenoid?
A relay moves a plunger inside of it
A solenoid moves a plunger inside of it
A solenoid can only move the arm of a switch
A relay is a stronger magnet than a solenoid
What is the difference between a fuse and a circuit breaker?
A fuse burns through, a circuit breaker can be reset.
A fuse can be reset, a circuit breaker burns through.
Both burn through but one is physically bigger
Both can be reset but one is physically bigger
What is the difference between a fuse and a current limiter?
A fuse can be reset but a current limiter burns through
A fuse burns through but a current limiter can be reset
Both burn through but one is physically bigger
Both can be reset but one is physically bigger
What are fuses, circuit breakers, and current limiters protecting?
The component in the system
The aircraft voltage source
The in-line voltage indicators
The wires
What is this the schematic for?
Circuit Breaker
Diode
Fuse
Relay
What is this the schematic for?
Circuit Breaker
Diode
Fuse
Relay
What is this the schematic for?
Circuit Breaker
Diode
Fuse
Relay
We make diodes out of two types of material. What do we call them and why?
P and N for potential and neutral
N and P and N for Not Pointing iN
P and N for positive and negative
None of these
Electrons want to seek out the positive side but they need some energy to move all the way over there. We call getting this flow started FORWARD BIAS. How much current does it require?
0.3 V
0.5 V
0.7 V
1.0 V
What happens if we run the current in the opposite direction, reverse biasing?
It will take more voltage to get current flowing
We need 0.7 V but current will flow faster
We need 0.7 V but current will flow slower
Nothing will happen, current flow will be blocked
What has happened if we do get current in both directions, with minimal resistance, when we test it?
The diode has opened internally
The diode has shorted internally
The diode has reached it's zener point
Nothing, that is correct operation
Which side of the diode is the cathode, and what does that mean?
A - the positive side
A - the negative side
B - the positive side
B - the negative side
A transistor is a device similar to a diode with an extra layer of P or N material. There are 2 types, PNP and ___
NNP
NPN
NPP
PPN
Which type of transistor does this schematic represent?
NPN
PNP
Both of these
None of these
There are 3 points on a transistor, the Emitter, the Base, and the _____
Cathode
Conical seal
Collector
Creatine
Which point is the collector?
A
B
C
N
The electrodes on batteries are also called anode and cathode. Which one is the anode?
The black one
The red one
The fluid in between the two
What is the fluid in between the two electrodes called?
Electrolytic fluid
Electrolysis
Electrolyte
Internal resistance
Big batteries can have several smaller ones inside it, or we can connect several together in a circuit. What do we call these individual pieces?
Ampoules
Cells
Divisions
Electrobits
How are they connected here, and how does that affect the total voltage?
In series, adding all the voltages together
In series, voltages remain constant
In parallel, adding all the voltages together
In parallel, voltages remain constant
So if we connect 4 NiCad together in series our voltage should be ____
1.25 V
2.5 V
4 V
5 V
Which is true of "PRIMARY" and "SECONDARY" cells?
Only primary cells can be main aircraft batteries
Secondary cells must be thrown away after discharge
Secondary cells can be recharged
We need a primary cell first then secondary cells can be connected after
Batteries can have dry cells, which means the electrolyte is ____
Paste
Gel
Both of these
None of these
Over time the electrolyte can deteriorate, which causes what to change?
The internal resistance increases
The anode will erode away
The cathode will erode away
The closed circuit voltage increases
What is the difference between Closed Circuit Voltage and Open Circuit Voltage?
OCV is when the circuit it open, no electron flow; CCV has a load applied
OCV is when there is open airflow; CCV is when the circuit is in a small space
OCV is a circuit with opening components like switches; CCV circuits will have no openings
OCV will always be lower than CCV
Going back to our 4 NiCad batteries in series, 5 V would be the ____
OCV
CCV
Both of these
None of these
Let's put it all together and troubleshoot a circuit. What is our first step?
Gather all the data
Paperwork
Identify the problem
Make a plan
What should be our total circuit resistance?
100 ohms
200 ohms
300 ohms
33.3333 ohms
What is wrong if our voltage measures
A: 24 V
B: 0 V
C: 0 V
D: 0 V
E: 0 V
The switch is open
The fuse is blown
R1 is open
R2 is open
Is the fuse big enough for our circuit? (HINT: what is the It, and is it less than the fuse rating?)
Yes
No
We replace the fuse. What is our next step?
Paperwork
Buy another fuse so we have a spare
Gather data
Test the system
We turn power on and the fuse immediately blows again. What do we suspect?
Too much voltage being supplied
The circuit is shorted
The circuit is open
One resistor is shorted
In series if the short removed all of the load, the fuse will blow. If we short only one resistor, will a series (A) or parallel (B) circuit still blow the fuse?
The series will, the parallel will not
The series will not, the parallel will
Neither circuit will blow the fuse
Both circuits will blow the fuse
Back to our series circuit. NEW PROBLEM. Voltage measurements:
A: 10 V
B: 10 V
C: 5 V
D: 5 V
E: 0 V
R1 is damaged
R2 is damaged
R3 is damaged
No problem, this is normal voltage drops
Which of these is the series and which is parallel?
A is series
B is parallel
A is parallel
B is series
They are both combination circuits
They are both series circuits
If the wiper of the variable resistor is positioned at the middle of it's travel, what is the total resistance of this circuit?
50 ohms
100 ohms
150 ohms
200 ohms
