Siemens DTU3005-B Spezifikationen PDF herunterladen (Seite 36)

Review 3

1. The second harmonic of a 60 Hz power supply is

____________ Hz.

2. Typically, the total harmonic distortion (THD) of a

voltage waveform should not exceed ____________ %.

3. ____________ sequence harmonics do not produce a

rotating magnetic field.

a. Positive

b.Negative

c. Zero

4. A transformer’s ability to handle the extra heating

caused by harmonics is determined by a ____________

rating.

5. In a purely ____________ circuit, voltage and current are

in phase.

a. resistive

b.inductive

c. capacitive

6. ____________ power represents a load which includes

reactive power and true power.

7. ____________ is the ratio of true power to apparent

power.

8. An increase in reactive power would require a

corresponding ____________ in transformer size.

a. increase

b.decrease

9. It is possible to correct for sag with the addition of a

____________ .

a. voltage regulator

b.power line conditioner

c. proper wiring

d.all of the above

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Siemens DTU3005-B Spezifikationen Seite 36