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Electric Motors Controls BOMA Pre-Quiz Questions with Accurate Answers
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Electric Motors Controls BOMA Pre-Quiz
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Electric Motors Controls BOMA Pre-QuizHow does a U.P.S. (Uninterruptible power supply) work? - answerAC rectified to DC
batteries then Inverted to AC
Batteries energy capacity is measured in? - answerAmp-hours
Batteries have two rated values. - answerVoltage and amp-hours
How do you top off water in a battery cell? - answerDistilled water when the level is
below the plate.
A voltage monitor relay is used for? - answerStarting backup generators.
Fuel for diesel generators is often stored in a? - answerDay tank
_____ converts between electrical and mechanical power. - answerMotor, Generator,
alternator.
The field winding on a generator: - answerProduces the magnetic field.
The stationary members of a generator is called a - answerStator
A motor - answerConverts electrical energy into mechanical energy.
an armature is - answerThe movable portion of a contractor.
In a process control, delay is: - answerThe time it takes for a change in the process to
be felt.
What is the difference between a contactor and a starter? - answerA starter has
overload protection
How is a holding circuit wired? - answerStop push buttons I series,
Start push buttons in parallel,
Using a holding contact.
What protects circuits from short circuits? - answerBreakers
Soft-starts work by? - answerLowering voltage during start up
, When a starter has a built in disconnect, we call it a? - answerCombination starter
Normally closed means? - answerThere is continuity when the component is on the
shelf
What is an example of a P.E. Switch? - answerPressure operated electric switch.
The input and output power of a transformer is rated in? - answerKVA
A soft start is used to? - answerReduce starting current
AC motor speed is determined by? - answerThe number of poles.
DC arcs. - answerAre the most difficult to extinguish.
Arc chutes. - answerHelp confine the arcs.
The lower the NEMA rating on a contactor - answerThe lower the current it can handle
The current rating of a contactor. - answerThe max current for each contact.
A contactor with two sets of contacts is? - answer2 pole contactor
How do overloads protect a motor? - answerPreventing excessive heating effects of
high current
A double-break contacts function is to reduce the current of each arc. - answerTrue
Overloads which have a delay in reacting to high current is? - answerTo prevent tripping
during the starting period
What is used when it is necessary to control a high power or high voltage circuit with a
low power circuit - answerReplays
Time delays on ATS systems can be done by using? - answerOil dashpots
What consists of an electromagnetically inductive coil, wound around a movable steel or
iron slug? - answerSolenoid
A latching circuit consists of? - answerStart and stop push buttons.
The smallest size motor starter is? - answerNEMA rating 00
Providing isolation from hazardous voltages and preventing starting by partial ground
faults can be done by using!? - answerTransformers
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