Power Quality 4

Question 1

Which of the following tools isNOTone of the common tools available for monitoring and maintaining power quality?

Select one:

a. Ammeter
b. Permanently-installed systems
c. Portable monitors
d. Trade journals

Answer 1

a. Ammeter

Question 2

What is sometimes the best preparation a person can make to ensure a successful power quality activity?

Select one:

a. Reading the user’s guide for the equipment to be monitored
b. Verify that the power has been removed from the source before connecting the equipment
c. Verify that the equipment has been calibrated
d. All of the above

Answer 2

a. Reading the user’s guide for the equipment to be monitored

Question 3

What is perhaps the best Power Quality scenario?

Select one:

a. Finding a potential problem before it shuts the system down
b. The damage to equipment is minimal
c. The equipment needed for the analysis is easily accessible
d. The problem corrects itself

Answer 3

a. Finding a potential problem before it shuts the system down

Question 4

It is usually wise to have the?tool doing the monitoring until the source of the problem can be narrowed down.

Select one:

a. least expensive
b. most expensive
c. most versatile
d. smallest

Answer 4

c. most versatile

Question 5

The digital multimeter (DMM) is useful for detecting?unbalances (or imbalances).

Select one:

a. current
b. frequency
c. harmonic
d. voltage

Answer 5

d. voltage

Question 6

A 3% voltage imbalance between phases may result in the need to de-rate electric motors by?.

Select one:

a. 10%
b. 15%
c. 20%
d. 25%

Answer 6

a. 10%

Question 7

Both voltage unbalance and harmonics are generally considered as?power quality problems.

Select one:

a. constant-state
b. steady-state
c. variable-state
d. none of the above

Answer 7

b. steady-state

Question 8

Portable monitors use the?approach to troubleshoot problems.

Select one:

a. comparative
b. proactive
c. reactive
d. shotgun

Answer 8

c. reactive

Question 9

The ability to set a monitoring device to?automatically when a power quality event occurs allows one to analyze the causes of the problem.

Select one:

a. disconnect power
b. immobilize the circuit
c. reset
d. trigger

Answer 9

d. trigger

Question 10

Portable PQ monitors can provide graphical displays of waveforms and trending information for?parameters.

Select one:

a. up to 25
b. up to 50
c. up to 75
d. hundreds of

Answer 10

d. hundreds of

Question 11

Permanently-installed power quality monitoring systems are typically?and provide the advantage of showing trends.

Select one:

a. analog
b. digitally encrypted
c. very large
d. web-based

Answer 11

d. web-based

Question 12

Most power quality analyzers have accompanying?that runs on a PC, which provides event data viewing capability.

Select one:

a. analysis software
b. application software
c. troubleshooting software
d. all of the above

Answer 12

b. application software

Question 13

The?is one of the most popular tools for PQ monitoring because it does not require contact with energized circuits.

Select one:

a. ammeter
b. digital multimeter
c. infrared imager
d. permanently installed PQ monitoring system

Answer 13

c. infrared imager

Question 14

A(n)?is used to measure temperature at different points in a system, looking for evidence of overheating.

Select one:

a. digital multimeter
b. infrared imager
c. portable PQ monitoring system
d. permanently installed PQ monitoring system

Answer 14

b. infrared imager

Question 15

What effect can a heating and cooling (expansion and contraction) cycle have on equipment?

Select one:

a. It can melt the conductors over time.
b. It loosens the mechanical connections of conductors.
c. Heating and cooling can permanently damage the equipment.
d. There is no effect from heating and cooling.

Answer 15

b. It loosens the mechanical connections of conductors.

Question 16

Which of the following are examples of useful documentation for someone performing a power quality analysis?

I. User guides for meters and monitors
II. Maintenance manuals for equipment
III. Electrical equipment maintenance publications
IV. Trade journals
V. Standards

Select one:

a. I. and II. only
b. I., II., and III. only
c. I., II., III., and V. only
d. I., II., III., IV., and V.

Answer 16

d. I., II., III., IV., and V.