VFD SACA Practice Exam 2025-2026 Most
Recent Version Comprehensive 50 Questions
and Verified Answers Accurate Solutions Already
Graded A+ Get it 100% Correct
A 2-pole motor can operate at 125% its rated speed, while a 4-pole motor can operate
as high as ______ - CORRECT ANSWER: 200%
A constant, linear speed change when accelerating or decelerating a motor is called
________ - CORRECT ANSWER: Ramping
A pair of two-position switches allow __________ possible input combinations. -
CORRECT ANSWER: Four
Abruptly removing voltage from the motor terminals will cause the motor to __________
to a stop - CORRECT ANSWER: Coast
AC motors require __________ power at startup compared to equivalent DC motors. -
CORRECT ANSWER: Less
Certain frequencies from a VFD can cause a motor to run rough or vibrate. - CORRECT
ANSWER: True
DC injection braking is used to quickly __________ an AC induction motor. - CORRECT
ANSWER: Stop
High inertia loads like __________ often require S-acceleration/deceleration instead of
straight ramping. - CORRECT ANSWER: Conveyor belts
, Many VFDs provide a low speed boost that produces more torque by lowering the Volts
per Hertz ratio - CORRECT ANSWER: False
Most motors can handle a DC injection current up to __________ of the amp rating -
CORRECT ANSWER: 180%
Most variable frequency AC drives will not allow you to use manual inputs to jog a
motor. - CORRECT ANSWER: False
Most VFDs supply AC power to the motor with a __________ output. - CORRECT
ANSWER: Pulse width modulation (PWM)
Ramping up is controlled by the acceleration time parameter. - CORRECT ANSWER:
True
S-curve acceleration is programmed as a percentage of the VFD's acceleration time
parameter. - CORRECT ANSWER: True
The __________ stage of a VFD changes AC power into DC power. - CORRECT
ANSWER: Rectifier
The acceleration time and deceleration time for a VFD must always be the same. -
CORRECT ANSWER: False
The DC link stage of a VFD filters the rectified power and increases or decreases the
DC ________ - CORRECT ANSWER: Voltage
The simplest external control scheme for motor operation is the __________ circuit. -
CORRECT ANSWER: Two wire
Recent Version Comprehensive 50 Questions
and Verified Answers Accurate Solutions Already
Graded A+ Get it 100% Correct
A 2-pole motor can operate at 125% its rated speed, while a 4-pole motor can operate
as high as ______ - CORRECT ANSWER: 200%
A constant, linear speed change when accelerating or decelerating a motor is called
________ - CORRECT ANSWER: Ramping
A pair of two-position switches allow __________ possible input combinations. -
CORRECT ANSWER: Four
Abruptly removing voltage from the motor terminals will cause the motor to __________
to a stop - CORRECT ANSWER: Coast
AC motors require __________ power at startup compared to equivalent DC motors. -
CORRECT ANSWER: Less
Certain frequencies from a VFD can cause a motor to run rough or vibrate. - CORRECT
ANSWER: True
DC injection braking is used to quickly __________ an AC induction motor. - CORRECT
ANSWER: Stop
High inertia loads like __________ often require S-acceleration/deceleration instead of
straight ramping. - CORRECT ANSWER: Conveyor belts
, Many VFDs provide a low speed boost that produces more torque by lowering the Volts
per Hertz ratio - CORRECT ANSWER: False
Most motors can handle a DC injection current up to __________ of the amp rating -
CORRECT ANSWER: 180%
Most variable frequency AC drives will not allow you to use manual inputs to jog a
motor. - CORRECT ANSWER: False
Most VFDs supply AC power to the motor with a __________ output. - CORRECT
ANSWER: Pulse width modulation (PWM)
Ramping up is controlled by the acceleration time parameter. - CORRECT ANSWER:
True
S-curve acceleration is programmed as a percentage of the VFD's acceleration time
parameter. - CORRECT ANSWER: True
The __________ stage of a VFD changes AC power into DC power. - CORRECT
ANSWER: Rectifier
The acceleration time and deceleration time for a VFD must always be the same. -
CORRECT ANSWER: False
The DC link stage of a VFD filters the rectified power and increases or decreases the
DC ________ - CORRECT ANSWER: Voltage
The simplest external control scheme for motor operation is the __________ circuit. -
CORRECT ANSWER: Two wire
