Electricians Quiz Final Test Flashcards
Small solid wire is usually joined by
Western union splice
Terminal lugs are used For multi stranded wire True or false
True
Conductor lacing is used to group a number of wires into bundles true or false
True
Self Clinching Cable straps (stay tied) Should never be used
On coaxial cable, in high temperature areas, Were straps may fall into moving components
When troubleshooting electrical equipment you should use a high impedance multi meter
To prevent excessive current flow through which would damage it
Describe a mobile man communication system
Radio
State the purpose for lacing conductors
To keep wires neat And allow easier tracing
Name four way to start a single phase motor
Shaded poles, Manually, Capacitors start, Starter windings
Disadvantage of a DC motor
Low starting torque In Series
Three ways a DC motor is wound
Shunt wound, series wound, compound wound
The greatest single cause of electrical resistance is the
High inductance
Which of the listed device is used to measure pressure and convert it to an Electrical signal
Transducer
When taking resistance readings the circuit should be
De-energized
What meter is used to check for continuity of a electrical circuit or devices
Ohms meter
A resistance in a circuit of unknown value is to be tested using the volt meter ampmeter method therefore the meter should be connected with
Both meters in parallel with resistance
Electrical Powers is expressed in Ohms true or false
False
A device that most commonly utilizes the principals of Electromagnetic induction is the
Transformer
What is the difference in the construction of high voltage transformers and low-voltage transformers
The number of turns in the winding in a step up transformer
What three generator Conditions Are needed to Safely parallel to the bus
Phase orientation, frequency, voltage
What uses magnetic induction
Solenoids and transformers
What application would a synchronous motor be used
Constant speed type
Synchronous motor’s uses separate DC Excitation current. True or false
True
LDP devices low-voltage protection device requires an operator to restart it manually true or false
True
How is a generator output voltage controlled
AVR automatic voltage regulator
What is the smallest USCG Mandated AWG on ships
18 AWG
Difference between DC motors and DC generators
Same
What system uses a thermistor
HVAC systems
What are two common core types for transformers
Shell and hollow type
What are we checking when measuring an air gap of a generator
Bearings
What semiconductors Change his resistance in a HVAC system
Thermistor
What do slip rings do
Supply current to the Armature to the DC motors or transfer between stationary rotating contacts
Why Megger
Checking the health of insulation
Different winding types in DC motors
Lap winding and Wave windings
Lap windings are high current low-voltage
Wave windings are high in voltage space efficient and low-cost
What are the three losses of transformers
Eddy current copper and Hyatt
Four ways to start a AC motor
Shaded pole, starter windings, capacitor, manually
Four types of diagrams
Wiring
Single line
Block
Schismatic
What is slip
When a rotor can’t catch up
What’s a commutator
Dc motor
Motors convert electrical energy to mechanical Power using what principle
Voltage induction
Interpoles accomplish the same thing as
Compensating winding
A inductance reactants load is expressed in
Ohms
