TCM 322 EXAM 1 QUESTIONS AND
ANSWERS ALL CORRECT
What is a hickey bender? - Answer- makes several short bends along a conduit- can
vary the radiuses
What is the conduit reamer? - Answer- A tool used to clean the edges of EMT
What is a neutral? - Answer- A grounded current carrying conductor- it must be white or
gray
What is the purpose of grounding and bonding? - Answer- Preventing electrical shocks
and fires
Why are electrical systems, equip, and conductive materials enclosing the system
grounded? - Answer- To facilitate the immediate response of the overcurrent protective
devices to ground faults
To know the definitions of grounding and bonding- look in the book - Answer- do it
What does the code suggest for a max voltage drop? - Answer- 3% for any branch
circuit
5% between the service entrance and the utilization outlet
Formula for Voltage drop - Answer- VD= 2xLxIxR / 1000
The resulting answer is volts- to find the percent, take this result and divide it by the
voltage of the system
These slides do not include all the formulas or calculation problems. To be successful
on the test, go through and put tabs in your code book, and be familiar with how to
calculate the different things we did in class. - Answer- Good Luck, and don't forget that
you can use a cheat sheet on the exam.
What is Current? (Definition, Unit of Measurement, Symbol) - Answer- The rate of flow
for an electrical charge. It is measure in Amperes (Amps) and the symbol is (I)
, What is Voltage? (Definition, Unit of Measurement, Symbol) - Answer- It is what makes
electrons flow (think of it as a pressure). It is measured in volts, and the symbol is (E) or
(V).
What is used to define voltage? - Answer- Power..... 1 watt produces a flow of 1 amp
across a potential of 1 volt. Most batteries are 1.5 Volt. A fridge and TV are 120V.
What is DC Current? - Answer- Direct Current.. In DC, Voltage and Current never vary.
Think of flashlights, phones, cars.
What is AC Current? - Answer- Alternating Current. Voltage and Current vary with time.
Think of buildings, outlets, lights, elevators.
What is frequency measured in, and what is the frequency of US and Foreign Power? -
Answer- Hertz
US- 60 Hz
Foreign Countries- 50 Hz
What are the two types of AC Power? - Answer- Single Phase
Three Phase
What is Resistance? (Definition, Unit of Measurement, Symbol) - Answer- Resistance is
the opposition to the flow of current. it is measured in Ohms and the symbol is (R). 1
Ohm allows a current of 1 Amp at 1 Volt.
What is Impedance? (Definition, Unit of Measurement, Symbol) - Answer- Impedance is
pretty much the same thing as Resistance, but for AC Applications. It is measure in
Ohms as well. Symbol = (Z)
What is Capacitance? - Answer- the ability to store energy in an electric field.
What does the term dielectric mean? - Answer- It is a nonconductor of electricity
What is cross-talk? - Answer- When stray capacitance allow signals to leak between
isolated circuits.
What is Inductance? - Answer- the ability to store energy in a magnetic field.
What are the Ohm's Law formulas for AC and DC? - Answer- AC: I(t)= E(t) / Z
DC: I= E/R
What are Kirchhoff's Two Laws? - Answer- 1: All electric current into and out of any
junction in a circuit is zero
2: All voltages measured around a closed path in an electric circuit is zero
ANSWERS ALL CORRECT
What is a hickey bender? - Answer- makes several short bends along a conduit- can
vary the radiuses
What is the conduit reamer? - Answer- A tool used to clean the edges of EMT
What is a neutral? - Answer- A grounded current carrying conductor- it must be white or
gray
What is the purpose of grounding and bonding? - Answer- Preventing electrical shocks
and fires
Why are electrical systems, equip, and conductive materials enclosing the system
grounded? - Answer- To facilitate the immediate response of the overcurrent protective
devices to ground faults
To know the definitions of grounding and bonding- look in the book - Answer- do it
What does the code suggest for a max voltage drop? - Answer- 3% for any branch
circuit
5% between the service entrance and the utilization outlet
Formula for Voltage drop - Answer- VD= 2xLxIxR / 1000
The resulting answer is volts- to find the percent, take this result and divide it by the
voltage of the system
These slides do not include all the formulas or calculation problems. To be successful
on the test, go through and put tabs in your code book, and be familiar with how to
calculate the different things we did in class. - Answer- Good Luck, and don't forget that
you can use a cheat sheet on the exam.
What is Current? (Definition, Unit of Measurement, Symbol) - Answer- The rate of flow
for an electrical charge. It is measure in Amperes (Amps) and the symbol is (I)
, What is Voltage? (Definition, Unit of Measurement, Symbol) - Answer- It is what makes
electrons flow (think of it as a pressure). It is measured in volts, and the symbol is (E) or
(V).
What is used to define voltage? - Answer- Power..... 1 watt produces a flow of 1 amp
across a potential of 1 volt. Most batteries are 1.5 Volt. A fridge and TV are 120V.
What is DC Current? - Answer- Direct Current.. In DC, Voltage and Current never vary.
Think of flashlights, phones, cars.
What is AC Current? - Answer- Alternating Current. Voltage and Current vary with time.
Think of buildings, outlets, lights, elevators.
What is frequency measured in, and what is the frequency of US and Foreign Power? -
Answer- Hertz
US- 60 Hz
Foreign Countries- 50 Hz
What are the two types of AC Power? - Answer- Single Phase
Three Phase
What is Resistance? (Definition, Unit of Measurement, Symbol) - Answer- Resistance is
the opposition to the flow of current. it is measured in Ohms and the symbol is (R). 1
Ohm allows a current of 1 Amp at 1 Volt.
What is Impedance? (Definition, Unit of Measurement, Symbol) - Answer- Impedance is
pretty much the same thing as Resistance, but for AC Applications. It is measure in
Ohms as well. Symbol = (Z)
What is Capacitance? - Answer- the ability to store energy in an electric field.
What does the term dielectric mean? - Answer- It is a nonconductor of electricity
What is cross-talk? - Answer- When stray capacitance allow signals to leak between
isolated circuits.
What is Inductance? - Answer- the ability to store energy in a magnetic field.
What are the Ohm's Law formulas for AC and DC? - Answer- AC: I(t)= E(t) / Z
DC: I= E/R
What are Kirchhoff's Two Laws? - Answer- 1: All electric current into and out of any
junction in a circuit is zero
2: All voltages measured around a closed path in an electric circuit is zero
