BOMA; ELECTRICAL MOTOR CONTROLS EXAM
QUESTIONS AND ANSWERS
Typically, a magnetic motor starter's holding or maintaining contact is
connected in parallel with the? ANSWER Starter coil, stop push button, and
start push button
Both AC and DC contactors' armatures need to be able to move freely, right?
ANSWER: Every contact has the potential to fuse.
Which of the following devices keeps motors from using excessive amounts of
electricity? ANSWER overloads
A motor starter's ANSWER overload protection is the main distinction between
it and a motor contactor.
A decreased motor's objective is to? ANSWER lower the motor starter's
voltage.
To keep an eye on the motor's heating properties at each speed, two-speed
motors need two sets of overloads. ANSWER: True
An electric motor has overcurrent protection to guard against the heating impact
of too much current damaging the windings. ANSWER: True
What is a fuse breaker's current interrupting capability? ANSWER the highest
current it ought to carry while operating normally.
What is the purpose of reduced voltage starting? ANSWER: Lowering the
initial current
How can one alter the speed of an AC squirrel cage motor? ANSWER
Modifying the quantity of poles
What could be included in a short circuit ground fault device? ANSWER A
circuit breaker with a fuse
, 00? is the identification for a tiny motor starter. ANSWER True
What is the term for the amount of time it takes for a process change to be
noticeable at the measuring device in a process control? ANSWER DELAY
Without an electrical connection between the two circuits, a relay is a device
that can move an action from one circuit to another. ANSWER: True
What does the term "EP switch" mean? ANSWER: Switch with electric
pneumatic operation
Never connect the fuse jumper between two objects when troubleshooting with
one. L1 and L2 ANSWERS
When a system is down and won't operate at all, what should you check first?
ANSWER The AC power source
An AC electromagnetic or solenoid may hum excessively if the pole faces are
not aligned properly. ANSWER: True
Should an ohm meter be used to indicate a good diode? ANSWER One
direction has little resistance, while the other direction has considerable
resistance.
Readings of unbound resistance between a three-phase motor's windings
suggest that the motor windings may? ANSWER Be disintegrating
Low voltage release is provided by a motor control circuit that enables the
motor to start automatically upon power restoration. ANSWER supposedly
hooked across the line that is supplied
What controls an induction motor's speed? ANSWER The quantity of poles
When an electric current passes through a coil's turns, what is created?
ANSWER A field of magnetic
What is the typical purpose of rheostats in motor controls? ANSWER Motors
with unique designs
QUESTIONS AND ANSWERS
Typically, a magnetic motor starter's holding or maintaining contact is
connected in parallel with the? ANSWER Starter coil, stop push button, and
start push button
Both AC and DC contactors' armatures need to be able to move freely, right?
ANSWER: Every contact has the potential to fuse.
Which of the following devices keeps motors from using excessive amounts of
electricity? ANSWER overloads
A motor starter's ANSWER overload protection is the main distinction between
it and a motor contactor.
A decreased motor's objective is to? ANSWER lower the motor starter's
voltage.
To keep an eye on the motor's heating properties at each speed, two-speed
motors need two sets of overloads. ANSWER: True
An electric motor has overcurrent protection to guard against the heating impact
of too much current damaging the windings. ANSWER: True
What is a fuse breaker's current interrupting capability? ANSWER the highest
current it ought to carry while operating normally.
What is the purpose of reduced voltage starting? ANSWER: Lowering the
initial current
How can one alter the speed of an AC squirrel cage motor? ANSWER
Modifying the quantity of poles
What could be included in a short circuit ground fault device? ANSWER A
circuit breaker with a fuse
, 00? is the identification for a tiny motor starter. ANSWER True
What is the term for the amount of time it takes for a process change to be
noticeable at the measuring device in a process control? ANSWER DELAY
Without an electrical connection between the two circuits, a relay is a device
that can move an action from one circuit to another. ANSWER: True
What does the term "EP switch" mean? ANSWER: Switch with electric
pneumatic operation
Never connect the fuse jumper between two objects when troubleshooting with
one. L1 and L2 ANSWERS
When a system is down and won't operate at all, what should you check first?
ANSWER The AC power source
An AC electromagnetic or solenoid may hum excessively if the pole faces are
not aligned properly. ANSWER: True
Should an ohm meter be used to indicate a good diode? ANSWER One
direction has little resistance, while the other direction has considerable
resistance.
Readings of unbound resistance between a three-phase motor's windings
suggest that the motor windings may? ANSWER Be disintegrating
Low voltage release is provided by a motor control circuit that enables the
motor to start automatically upon power restoration. ANSWER supposedly
hooked across the line that is supplied
What controls an induction motor's speed? ANSWER The quantity of poles
When an electric current passes through a coil's turns, what is created?
ANSWER A field of magnetic
What is the typical purpose of rheostats in motor controls? ANSWER Motors
with unique designs
