313D Electrical Exam (complete) Flashcards
If the total voltage drop in a circuit does not equal the applied voltage?
Poor wire connection
A blackened fuse indicates?
Short Circuit
The total resistance in a parallel circuit?
Will be lower than the lowest resistance
If the current through a conductor increases, the magnetic field around the conductor will?
Increase
A fuse that is good will have a resistance of?
A measurable resistance
A blown fuse will have a reading of?
Infinity(OL)
Four Resisters are connected in Parellel, the current flow will be highest through which resistor?
1. 3 Ohms
2. 5 Ohms
3. 7 Ohms
4. 9 Ohms
3 Ohms
The value of two 5 MFD Capacitors connected in Parellel are?
10 MFD
The value of two 5MFD Capacitors connected in series is?
2.5 MFD
The value of two 20 Ohm resistors in parellel is
10 Ohms
The value of two 20 ohms resistors in series is?
40 Ohms
The ohm reading across a closed switch should be?
0 Ohms
The voltage reading across an open switch should be?
The applied voltage
Which conductor has the largest cross section or diameter?
1. #10
2. #12
3. #18
4. #14
AWG
10
14awg wire is rated to carry____ amps max?
15
10 awg wire is rated to carry____ amps max?
30
How many conductors can be wrapped around a screw terminal on a switch or receptacle?
One
What is the minimum distance that conductors must extend into a junction box?
6”
If using an analog Ohmeter and the needle points to the symbol “0” what does this indicate?
Measurable resistance
If using an analog ohmmeter and the needle points to (8) symbol what does this indicate?
Open circuit
When using an analog voltmeter to measure an unknown votage, what range should your meter be set to?
0-750 V
If using an analog voltmeter to what should you set your meter scale to on a 120 volt circuit?
0-125 V
If the resistance remains constant in a circuit, and the voltage goes down, what will the remaining amperage do?
Go down
If the amperage remains constant in a circuit, and the resistance goes down, what will the voltage do?
Decrease
If the voltage remains constant, and the resistance goes down, what will the amperage do?
Go up
A contactor resembles?
A relay
Transformer output is measured in what units?
VA Volt-amps
A 120 volt primary and a 24 secondary, would be considered what type of transformer?
Step down
The neutral connections on a receptacle are attached to what color terminal?
Silver
The hot connections on a receptacle are attched at what color terminal?
Gold
Potential is another term used for?
Voltage
How many BTU’s are there in 10,000 W(10kW) of power?
34,100
How many BTU’s are there in 1 watt of power?
3.41
Voltage may also be expressed as
Electromotive force
When measuring parellel circuit amperage
Use an ammeter in Series with the load
When measuring a parellel circuit voltage
Use a voltmeter in parellel with the load
When measuring series circuit amperage?
Use an ammeter in series with the load
In a series circuit…?
There is one path for current to flow
The number of watts an appliance is using is obtained by?
Multiplying the voltage and amperage used by the appliance
Resistance is measured in?
Ohms
Amperage is measured in?
Amperes
Voltage is measured in?
Volts
Power is measured in?
Watts
How many watts are in one horsepower?
746
In the E,I,R triangle (Ohm’s Law) the ‘R’ represents?
Resistance
In the E,I,R triangle the ‘I’ represents?
Amperage
In the E,I,R triangle the ‘E’ represents?
Voltage
Resistance in an electrical circuit is compared to what in a water piping system?
Resistance ex pipe size
Amperage in an electrical circuit is compared to what in a water piping system?
Flow
Voltage in an electrical circuit is compared to what in a water piping system?
Pressure
What devices are used in the circuit for amperage protection?
Fuses
How many Milliamps are found in 1 ampere?
1000
A kilovolt has how many volts?
1000
How many millivolts are there in a volt?
1000
The simple electrical circuit consist of?
Conductors, load,energy source
Rubber, glass and wood are good?
Insulators
Atoms are electrically neutral when they contain the same number of?
Protons and electrons
Copper and aluminum are good..?
Conductors
What are the three components that make up atoms?
Electrons, protons, neutrons
What is the term used to indicate that equipment is safe to be worked on?
The “Zero” mechanical state
After a lock is installed on equipment being serviced, who can remove the lock?
The person who installed the lock
What is the minimum sized bonding cable that can be used to bond the electrical system to the water supply?
6 Gauge
What must be marked on the electrical distribution panel when installing a breaker?
The name of the appliance served by the breaker
What is the minimum distance electrical equipment can be installed from a gas regulator?
36”
When a co-worker is being shocked, what is the most important rule to remember?
Disconnect power to circuit
The main factors affecting electrical shock are?
Amount of current, amount of voltage, condition of skin,
The main concern with static electricity is?
Arcing
A fuse that is blown will have a resistance reading of?
Infinity (OL)
