Test Instruments Flashcards
? is a method of using light to transport information from one location to another through thin filaments of glass or plastic.
Select one:
a.
Fiber optics
b.
Internet Protocol (IP)
c.
Transmission Control Protocol (TCP)
d.
Wireless
A
Nonlinear loads are a common source of ? problems.
Select one:
a.
harmonic
b.
noise
c.
sags
d.
transients
A
Improper phase sequence (phase reversal) is the changing of the sequence of any two phases in a three-phase system or circuit. Improper phase sequence reverses motor rotation.
Select one:
True
False
True
It is important to check a high voltage detector on a known (energized) voltage source or ? verifier before taking a measurement on an unknown voltage source.
Select one:
a.
energized fault
b.
high voltage
c.
piezo
d.
visual
C
Noncontact high voltage ? are designed to be used as current clamps but have open ends (a U shape) to allow safer current measurements.
Select one:
a.
ammeters
b.
piezo verifier
c.
verifiers
d.
voltmeters
A
Insulation has the lowest resistance when first placed into service on conductors and electrical devices.
Select one:
True
False
False
Megohmmeters and some hipot testers are also called ? .
Select one:
a.
capacitance testers
b.
insulation testers
c.
thumpers
d.
voltmeters
B
A(n) ? is a device that produces electricity when two different metals that are joined together are heated. The voltage produced is proportional to the applied heat (measured temperature).
Select one:
a.
hygrometer
b.
tachometer
c.
thermocouple
d.
thermometer
C
Photo tachometers are used for what kinds of applications?
Select one:
a.
A photo tachometer is used in applications in which the rotating object can be reached or touched.
b.
A photo tachometer is used in applications in which the rotating object cannot be reached or touched.
c.
A photo tachometer is used to measure linear speeds.
d.
All of the above.
B
A chip is an integrated circuit that is packaged in an insulating polymer case and is typically used to create digital circuits.
Select one:
True
False
True
The highest failure rate for most equipment occurs during the ? period.
Select one:
a.
break-in
b.
useful life
c.
wear-out
d.
none of the above
A
More Frequency, More ?.
Crosstalk
We can use ? multimeter to test for simple power interruptions.
MIN/MAX
Power factor is equal to Volt-amps divided by ?.
Watts
Power Factor is equal to apparent power divided by ?.
True Power
