SACA MOTOR CONTROLS TEST QUESTIONS
AND ANSWERS
Question 158
Parts of an electrical system that should be connected to earth ground include
__________.
Correct Answer
metal raceways, metal conduit, metal enclosures (all of the above)
Question 159
The relationship between the input voltage and output voltage of a transformer is
based on the __________.
Correct Answer
turns ratio
Question 160
Which of the following is a factor that must be considered when selecting overcurrent
protection devices for a motor control circuit?
Correct Answer
Rated full-load current of the motor
Question 161
Which of the following is a disadvantage of starting a motor with an AC drive instead
of line starting?
Correct Answer
Lower starting torque
Page 1 of 35
,Question 162
Control relays are not capable of performing memory logic by themselves.
Correct Answer
True
Question 163
With the test probes placed in the circuit as shown in the figure, what should the
voltage reading be if the start pushbutton is pressed, assuming the circuit is operating
properly?
Correct Answer
Full control voltage
Question 1
DC injection braking involves applying DC power to one or all of an AC motor's
windings to stop the rotation.
Correct Answer
True
Question 2
The minimum number of sets of contacts a motor starter has depends on the number
of power leads the motor requires.
Correct Answer
True
Page 2 of 35
,Question 3
Once energized, the contacts of a zero speed switch will not deenergize until the
rotation has stopped.
Correct Answer
True
Question 4
Which of the following is a component of an electromagnetic brake?
Correct Answer
Coil, Spring, Pressure plate
Question 5
What are the functions of motor control?
Correct Answer
Speed control, reversing, start/stop control.
Question 6
The difference between the set point pressure and reset pressure is called the
__________.
Correct Answer
differential
Question 7
Which of the following is not a common voltage supplied by a wye-configured
system?
Correct Answer
240 VAC
Page 3 of 35
, Question 8
One application of interlocking is to cause both the forward and reverse coils of a
reversing contactor to be energized at the same time.
Correct Answer
False
Question 9
Which of the following is a use of an indicator lamp?
Correct Answer
Indicate that the power is on, Indicate that a cycle has begun, Indicate that a
dangerous condition is occurring.
Question 10
__________ protection on a manual starter will prevent the automatic restart of a motor
when recovering from a power loss.
Correct Answer
Undervoltage
Question 11
A three-wire control circuit is not as safe as a two-wire control circuit.
Correct Answer
False
Question 12
Which of the following is not a reason to use reduced-voltage starting on a motor?
Correct Answer
Produce higher speed at startup.
Page 4 of 35
AND ANSWERS
Question 158
Parts of an electrical system that should be connected to earth ground include
__________.
Correct Answer
metal raceways, metal conduit, metal enclosures (all of the above)
Question 159
The relationship between the input voltage and output voltage of a transformer is
based on the __________.
Correct Answer
turns ratio
Question 160
Which of the following is a factor that must be considered when selecting overcurrent
protection devices for a motor control circuit?
Correct Answer
Rated full-load current of the motor
Question 161
Which of the following is a disadvantage of starting a motor with an AC drive instead
of line starting?
Correct Answer
Lower starting torque
Page 1 of 35
,Question 162
Control relays are not capable of performing memory logic by themselves.
Correct Answer
True
Question 163
With the test probes placed in the circuit as shown in the figure, what should the
voltage reading be if the start pushbutton is pressed, assuming the circuit is operating
properly?
Correct Answer
Full control voltage
Question 1
DC injection braking involves applying DC power to one or all of an AC motor's
windings to stop the rotation.
Correct Answer
True
Question 2
The minimum number of sets of contacts a motor starter has depends on the number
of power leads the motor requires.
Correct Answer
True
Page 2 of 35
,Question 3
Once energized, the contacts of a zero speed switch will not deenergize until the
rotation has stopped.
Correct Answer
True
Question 4
Which of the following is a component of an electromagnetic brake?
Correct Answer
Coil, Spring, Pressure plate
Question 5
What are the functions of motor control?
Correct Answer
Speed control, reversing, start/stop control.
Question 6
The difference between the set point pressure and reset pressure is called the
__________.
Correct Answer
differential
Question 7
Which of the following is not a common voltage supplied by a wye-configured
system?
Correct Answer
240 VAC
Page 3 of 35
, Question 8
One application of interlocking is to cause both the forward and reverse coils of a
reversing contactor to be energized at the same time.
Correct Answer
False
Question 9
Which of the following is a use of an indicator lamp?
Correct Answer
Indicate that the power is on, Indicate that a cycle has begun, Indicate that a
dangerous condition is occurring.
Question 10
__________ protection on a manual starter will prevent the automatic restart of a motor
when recovering from a power loss.
Correct Answer
Undervoltage
Question 11
A three-wire control circuit is not as safe as a two-wire control circuit.
Correct Answer
False
Question 12
Which of the following is not a reason to use reduced-voltage starting on a motor?
Correct Answer
Produce higher speed at startup.
Page 4 of 35
