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- 1. Multiple Choice
"AC" current refers to _____
current that changes or alternates its direction
current that is always in one constant direction
all calculataions for voltage in a circuit
none of the provided answers are correct
- 2. Multiple Choice
Common household AC power from a wall outlet _____
has a voltage rated at 120 V(RMS)
has an RMS voltage of about 70% of the Peak Voltage
all answers are wrong!
is rated at 120 volts Peak to Peak
- 3. Multiple Choice
A generator can create electric current _____
when its coils of wire are moving inside a magnetic field
that has a sinusoidal waveform
that has an arbitrary waveform
by maintaining no motion between the wires and the magnetic field inside
- 4. Multiple Choice
Watt's law can be written as P = I x V, where _____
P is power, I is current and V is voltage
this same equation applies to AC and DC values
this equation is not the same for AC as for DC
- 5. Multiple Choice
With pure resistor circuits, Voltage and Current are in phase _____
but with pure capacitor circuits or pure inductor circuits, they are not in phase
with DC circuits but not ever in phase with AC circuits
with AC circuits but not ever in phase with DC circuits
No Correct answers
- 6. Multiple Choice
Three phases of AC current, equally spaced apart _____
are 90 degrees out o phase with each other
are 120 degrees out of phase with each other
are 150 degrees out of phase with each other
none of the answers provided are true
- 7. Multiple Choice
The following is a common AC power source: _____
120 VAC, 1 phase with 3 wires
208 VAC, 3 phase, with 5 wires
480 VAC, 3 phase, with 4 wires
all answers are correct
- 8. Multiple Choice
A stepdown transformer has _____
a smaller voltage at the primary windings
a smaller voltage at the secondary windings
P secondary > P primary
steps down current while increasing voltage
- 9. Multiple Choice
Three phase transformers can have _____
Wye and Delta windings
only Wye winidngs
only Delta windings
only Step Up winding configurations
- 10. Multiple Choice
The turns ratio indicates _____
the ratio of the power at the Primary to the Secondary
the ratio of the voltage at the Primary to the Secondary
the efficiency of the transformer
the number of times the stator spins internally
- 11. Multiple Choice
An induction motor _____
can be connected directly to AC power
has a simple construction and requires little maintenance
is available in many sizes, speeds and frames
all answers are correct
- 12. Multiple Choice
Induction motors always rotate _____
faster than the symchronous speed
slower than the synchronous speed
at high speeds and are only available with Delta windings
at high speeds and are only available with Wye windings
- 13. Multiple Choice
The instrument used to measure the rotor speed is called
speedometer
synchronizer
tachometer
transformer
- 14. Multiple Choice
Control circuits for 3-phase induction motors _____
can employ a 1-phase control circuit
must have button switches on all three phases
cannot have a single phase transformer in it
must have 3 controls
- 15. Multiple Choice
I want to pass this test.
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