4A251 CDC SET B VOL 1, 4A251
SET B VOL 2, 4A251 SET B VOL 3,
4A251 CDC SET B VOL 4 EXAM |
SOVED!!
How are large transformers cooled? - ACCURATE ANSWERS✔✔
Immersion in oil.
In a three-phase transformer, how many degrees is each phase displaced?
- ACCURATE ANSWERS✔✔ 120°.
How are transformers classified? - ACCURATE ANSWERS✔✔
Service, purpose, and method of mounting and cooling.
Which type of transformer provides a steady secondary voltage from no
load to full load? - ACCURATE ANSWERS✔✔ Constant-potential.
What instrument do you use to measure true power? - ACCURATE
ANSWERS✔✔ Wattmeter.
Besides delta, what are the other two types of three-phase transformers
used by the Air Force? - ACCURATE ANSWERS✔✔ Grounded wye
and ungrounded wye.
,The Air Force prefers which three-phase distribution system? -
ACCURATE ANSWERS✔✔ Grounded wye.
Between which points would you measure to obtain line voltage in a
wye system transformer? - ACCURATE ANSWERS✔✔ Any two of the
three phases.
Which type of transformer eliminates spark hazards where flammable
anesthetics are used and gives added protection from electrical shock? -
ACCURATE ANSWERS✔✔ Isolation.
What is used to count ground-referenced electrons in an isolated power
system? - ACCURATE ANSWERS✔✔ Line isolation monitor (LIM).
What three branches make up the essential electrical system? -
ACCURATE ANSWERS✔✔ Life safety, critical, and equipment.
What minimum full-demand fuel supply are you required to have onsite
for an emergency generator? - ACCURATE ANSWERS✔✔ 2 hours'
worth.
How often should you exercise an emergency generator under full load?
- ACCURATE ANSWERS✔✔ 30 minutes at least once monthly.
What type of circuit provides power to the final overcurrent devices? -
ACCURATE ANSWERS✔✔ Feeder.
,The amount of current a conductor can safely carry depends on the metal
used, wire size, type of insulation, and - ACCURATE ANSWERS✔✔
location of the conductor.
What type of wiring system includes wire sizes No. 40 to No. 4/0? -
ACCURATE ANSWERS✔✔ American Wire Gauge (AWG).
Which wiring system would you use in small structures where the main
need is for lighting? - ACCURATE ANSWERS✔✔ Two-wire, single-
phase.
Which wiring system uses two ungrounded conductors and one neutral
conductor to provide power and light? - ACCURATE ANSWERS✔✔
Three-wire, single-phase.
What three-phase, four-wire system does the Air Force permit for use in
medical facilities? - ACCURATE ANSWERS✔✔ Wye-powered.
What types of fuses would you use in medical facilities? - ACCURATE
ANSWERS✔✔ Knife-blade and ferrule.
What type of circuit breaker is best for general use? - ACCURATE
ANSWERS✔✔ Thermal-magnetic.
, How are circuit breakers rated? - ACCURATE ANSWERS✔✔ Volts and
amperes.
What type of protective device is often found in bathrooms and wet
locations within a medical facility? - ACCURATE ANSWERS✔✔
Ground-fault circuit-interrupter.
Which is not a category of static uninterruptable power supply? -
ACCURATE ANSWERS✔✔ Rotary.
Which application would you use a stand-alone uninterruptable power
supply? - ACCURATE ANSWERS✔✔ Telemetry workstation.
What is the purpose for using a flywheel in a rotary uninterruptable
power supply? - ACCURATE ANSWERS✔✔ Provides temporary
kinetic energy until the generator warms up.
Connecting all exposed, noncurrent-carrying metal parts of an electrical
system to the Earth is what type of grounding? - ACCURATE
ANSWERS✔✔ Equipment.
Which example is a primary normal ground electrode? - ACCURATE
ANSWERS✔✔ A 15-foot metal underground water pipe with bonded
joints.
SET B VOL 2, 4A251 SET B VOL 3,
4A251 CDC SET B VOL 4 EXAM |
SOVED!!
How are large transformers cooled? - ACCURATE ANSWERS✔✔
Immersion in oil.
In a three-phase transformer, how many degrees is each phase displaced?
- ACCURATE ANSWERS✔✔ 120°.
How are transformers classified? - ACCURATE ANSWERS✔✔
Service, purpose, and method of mounting and cooling.
Which type of transformer provides a steady secondary voltage from no
load to full load? - ACCURATE ANSWERS✔✔ Constant-potential.
What instrument do you use to measure true power? - ACCURATE
ANSWERS✔✔ Wattmeter.
Besides delta, what are the other two types of three-phase transformers
used by the Air Force? - ACCURATE ANSWERS✔✔ Grounded wye
and ungrounded wye.
,The Air Force prefers which three-phase distribution system? -
ACCURATE ANSWERS✔✔ Grounded wye.
Between which points would you measure to obtain line voltage in a
wye system transformer? - ACCURATE ANSWERS✔✔ Any two of the
three phases.
Which type of transformer eliminates spark hazards where flammable
anesthetics are used and gives added protection from electrical shock? -
ACCURATE ANSWERS✔✔ Isolation.
What is used to count ground-referenced electrons in an isolated power
system? - ACCURATE ANSWERS✔✔ Line isolation monitor (LIM).
What three branches make up the essential electrical system? -
ACCURATE ANSWERS✔✔ Life safety, critical, and equipment.
What minimum full-demand fuel supply are you required to have onsite
for an emergency generator? - ACCURATE ANSWERS✔✔ 2 hours'
worth.
How often should you exercise an emergency generator under full load?
- ACCURATE ANSWERS✔✔ 30 minutes at least once monthly.
What type of circuit provides power to the final overcurrent devices? -
ACCURATE ANSWERS✔✔ Feeder.
,The amount of current a conductor can safely carry depends on the metal
used, wire size, type of insulation, and - ACCURATE ANSWERS✔✔
location of the conductor.
What type of wiring system includes wire sizes No. 40 to No. 4/0? -
ACCURATE ANSWERS✔✔ American Wire Gauge (AWG).
Which wiring system would you use in small structures where the main
need is for lighting? - ACCURATE ANSWERS✔✔ Two-wire, single-
phase.
Which wiring system uses two ungrounded conductors and one neutral
conductor to provide power and light? - ACCURATE ANSWERS✔✔
Three-wire, single-phase.
What three-phase, four-wire system does the Air Force permit for use in
medical facilities? - ACCURATE ANSWERS✔✔ Wye-powered.
What types of fuses would you use in medical facilities? - ACCURATE
ANSWERS✔✔ Knife-blade and ferrule.
What type of circuit breaker is best for general use? - ACCURATE
ANSWERS✔✔ Thermal-magnetic.
, How are circuit breakers rated? - ACCURATE ANSWERS✔✔ Volts and
amperes.
What type of protective device is often found in bathrooms and wet
locations within a medical facility? - ACCURATE ANSWERS✔✔
Ground-fault circuit-interrupter.
Which is not a category of static uninterruptable power supply? -
ACCURATE ANSWERS✔✔ Rotary.
Which application would you use a stand-alone uninterruptable power
supply? - ACCURATE ANSWERS✔✔ Telemetry workstation.
What is the purpose for using a flywheel in a rotary uninterruptable
power supply? - ACCURATE ANSWERS✔✔ Provides temporary
kinetic energy until the generator warms up.
Connecting all exposed, noncurrent-carrying metal parts of an electrical
system to the Earth is what type of grounding? - ACCURATE
ANSWERS✔✔ Equipment.
Which example is a primary normal ground electrode? - ACCURATE
ANSWERS✔✔ A 15-foot metal underground water pipe with bonded
joints.
