Power Quality Lvl I

Question 1

A power quality (PQ) instrument should be rated for the?range of voltage and current levels.

Select one:

a. anticipated
b. average
c. maximum
d. minimum

Answer 1

a. anticipated

Question 2

The installation, operation, and maintenance of the PQ instrument must be performed by?personnel.

Select one:

a. approved
b. certified
c. qualified
d. any of the above

Answer 2

c. qualified

Question 3

When accurate measurements are needed on sinusoidal waveforms to detect distortions, only?should be used.

Select one:

a. ammeters
b. thermal imagers
c. oscilloscopes
d. true RMS meters

Answer 3

d. true RMS meters

Question 4

What step(s) may be needed to ensure that the PQ instrument does not have any significant impact on the measurements themselves?

Select one:

a. Employ current transformers (CTs)
b. Employ high impedance voltage connections
c. Employ potential transformers (PTs)
d. a. and b.
e. a., b., and c.

Answer 4

d. a. and b.

Question 5

If PQ measurements require potential transformers (PTs) to step down voltages, make sure that the?that the PTs will pass through will not affect the readings.

Select one:

a. bandwidth of signals
b. frequency response
c. voltage
d. a. and b.
e. a., b., and c.

Answer 5

d. a. and b

Question 6

Connections to the voltage and current sources need to be made?.

Select one:

a. according to supervisor instructions
b. properly and safely
c. to the correct phase
d. all of the above

Answer 6

b. properly and safely

Question 7

Connections between the instrument and the circuit need to be made in accordance with the type of circuit being monitored and with the correct?.

Select one:

a. current range
b. impedance
c. phase relationships
d. voltage range

Answer 7

c. phase relationships

Question 8

What is the key to getting correct power data?

Select one:

a. Current phasors must be in the proper relationship prior to recording data.
b. Impedance settings must be selected properly prior to recording data.
c. Voltage phasors must be in the proper relationship prior to recording data.
d. a. and b.
e. a. and c.

Answer 8

e. a. and c.

Question 9

?, measured in watts, is used to determine power quality.

Select one:

a. Anticipated power
b. Average power
c. Maximum power
d. Real power

Answer 9

d. Real power

Question 10

Volt-amperes-reactive (vars), should only be computed on the?in a distorted or unbalanced system.

Select one:

a. first harmonic components
b. fundamental frequency components
c. power triangle value
d. a. or b.

Answer 10

b. fundamental frequency components

Question 11

Sub-quarter-cycle changes in the waveshape that usually do not trigger an RMS variation define?.

Select one:

a. interruptions
b. sags
c. swells
d. transients

Answer 11

d. transients

Question 12

Which of the following isNOTone of the three transient limits that must be set prior to monitoring?

Select one:

a. Absolute instantaneous peak
b. High frequency waveshape or negative/positive peak detectors magnitude
c. Peak or instantaneous trigger magnitude
d. Waveshape threshold duration or window

Answer 12

a. Absolute instantaneous peak

Question 13

Parameters such as?do not need to be checked every cycle, but they are useful to trigger an alarm when the approach limits are reached.

Select one:

a. demand
b. flicker
c. harmonics
d. power factor

Answer 13

D. Power Factor

Question 14

Once all of the programmable values are set up, it is recommended to run the instrument for?or so to verify that it is recording what you want recorded as well as not recording what is not wanted.

Select one:

a. 10 minutes
b. 15 minutes
c. 30 minutes
d. 60 minutes

Answer 14

C. 30 min