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HVAC Pretest BOMAexam questions with 100- correct answers
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HVAC Pretest BOMAexam questions with 100- correct answers
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Electric MotorsControls BOMA
Pre-Quiz(solved)
How does a U.P.S. (Uninterruptible power
supply) work? - answer AC rectified to DC
batteries then Inverted to AC
Batteries energy capacity is measured in? -
answer Amp-hours
Batteries have two rated values. - answer
Voltage and amp-hours
How do you top off water in a battery cell? -
answer Distilled water when the level is
below the plate.
A voltage monitor relay is used for? - answer
Starting backup generators.
,Fuel for diesel generators is often stored in
a? - answer Day tank
_____ converts between electrical and
mechanical power. - answer Motor,
Generator, alternator.
The field winding on a generator: - answer
Produces the magnetic field.
The stationary members of a generator is
called a - answer Stator
A motor - answer Converts electrical energy
into mechanical energy.
an armature is - answer The movable portion
of a contractor.
In a process control, delay is: - answer The
time it takes for a change in the process to
be felt.
, What is the difference between a contactor
and a starter? - answer A starter has
overload protection
How is a holding circuit wired? - answer Stop
push buttons I series,
Start push buttons in parallel,
Using a holding contact.
What protects circuits from short circuits? -
answer Breakers
Soft-starts work by? - answer Lowering
voltage during start up
When a starter has a built in disconnect, we
call it a? - answer Combination starter
Normally closed means? - answer There is
continuity when the component is on the
shelf
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