Electric Heat ESCO - HVAC Excellence Exam Tested Questions With Revised Answers
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Course
ESCO
Institution
ESCO
Electric Heat ESCO - HVAC
Excellence
Exam Tested Questions With
Revised Answers
A motor used in an electric furnace is rated at 230 VAC what is
the minimum and maximum voltages allowed - ANSWER
207 to 253
A tech reads 5 FLA on data plate approx what should the LRA
be - ANSWE...
Electric Heat ESCO - HVAC
Excellence
Exam Tested Questions With
Revised Answers
To adjust the airflow on a heater with a belt driven blower you
should - ANSWER adjust the motor pulley
The driven belt width used on fractional HP motor is -
ANSWER A
Typical RPM of residential direct driven blower is - ANSWER
1000 - 1200 RPM
Turning vanes are added to sheet metal elbows to - ANSWER
increase air velocity
The maximum recommended return air velocity of a residential
filter - ANSWER 400 fpm
,A rigid residential duct system should be desgined for a
maxium trunk velocity of ____ FPM - ANSWER 700 - 1,200
Hot spots on the electric heater strip are most often caused by
- ANSWER insufficient airflow over heater strip
A tech is selecting replacement motor for a furnace. what type
of bearings should be used for low noise level - ANSWER
Sleeve
A tech should use this type of oil to lube blower motor -
ANSWER 20 viscosity non-detergent
Most fractional HP motors use this type motor mount in
central electric furnaces - ANSWER resilient mounted
A tech is measuring the voltage to a 3ph 240 VAC blower
motor. the readings are L1 to L2 238 volt, L1 to L3 240 volt, L2
to L3 241 volts these reading indicate - ANSWER the
voltages are within allowable tolerances
, A motor used in an electric furnace is rated at 230 VAC what is
the minimum and maximum voltages allowed - ANSWER
207 to 253
A tech reads 5 FLA on data plate approx what should the LRA
be - ANSWER 15 to 25 amps
A tech checks a fan motor run capacitor to ground with an
analog ohmeter what resistance scale should be used -
ANSWER r X 10K
A tech is checking the ressitance of a multi speed blower motor
the reading are
high to common 10
med to common 12
low to common 14
start to common infinity
these reading indicate - ANSWER the motor has an open
start winding
The heating elements in a single phase 15 kW heater are
usually wired in - ANSWER parallel
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