C-202 (Electrical Engineering) SACA MOTOR
CONTROLS QUESTIONS AND ANSWERS
(100% Correct and Accurate)
A normally closed float switch is needed for a sump pump circuit.
False
A normally open float switch is needed for a sump pump circuit.
True
The difference between the set point pressure and reset pressure is called
the __________.
differential
The preset level where a pressure switch is activated is called the
__________.
set point
Automatic switches can have the same potential problems as manual
switches.
True
Which of the following is an application of a motor sequence control
circuit?
High pressure lubricator on a milling machine, Conveyor system, Cooling fan
on a machine
Based on the circuit diagram shown, motor 2 must be started before
motor 1.
False
,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?
Full control voltage
Based on the wiring diagram shown, which of the following statements is
true of a drum switch if the switch is placed in the reverse position?
L1 is connected to T3, L2 is connected to T2, and L3 is connected to T1.
Examine the circuit shown and determine which type(s) of interlocking
is/are shown.
Auxiliary contact and mechanical interlocking
Based on the circuit diagram shown, what will happen to the motor if the
JOG pushbutton is pressed?
The motor will run until the JOG button is released.
An elevator is a common application where motor braking is required.
True
Which of the following is a common method of braking a motor?
Dynamic braking, DC injection braking, Plugging
Which type of braking is commonly used on an elevator?
Electromagnetic
One simple method of plugging a motor is to use a drum switch.
True
Plugging a motor creates a counter torque that stops a motor's rotation.
True
, Which of the following is a disadvantage of plugging a motor?
Plugging creates stress on the motor and its load, Plugging a motor very rarely
brings the motor to a complete standstill, Plugging has limited applications.
Which of the following is not an advantage of plugging a motor?
Plugging does not put stress on the motor.
Once energized, the contacts of a zero speed switch will not deenergize
until the rotation has stopped.
True
An off-delay timer is used instead of a zero speed switch in a time-
controlled plugging circuit.
True
Timer-controlled plugging uses a zero speed switch which has a built-in
timer.
False
Which of the following is a component of an electromagnetic brake?
Coil, Spring, Pressure plate
Which of the following statements best describes an electromagnetic fail-
safe brake?
Spring engaged, electrically releases
One of the advantages of electromagnetic brakes is they are not
dependent on the load.
True
Which of the following is not an advantage of electromagnetic braking?
Efficiency
CONTROLS QUESTIONS AND ANSWERS
(100% Correct and Accurate)
A normally closed float switch is needed for a sump pump circuit.
False
A normally open float switch is needed for a sump pump circuit.
True
The difference between the set point pressure and reset pressure is called
the __________.
differential
The preset level where a pressure switch is activated is called the
__________.
set point
Automatic switches can have the same potential problems as manual
switches.
True
Which of the following is an application of a motor sequence control
circuit?
High pressure lubricator on a milling machine, Conveyor system, Cooling fan
on a machine
Based on the circuit diagram shown, motor 2 must be started before
motor 1.
False
,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?
Full control voltage
Based on the wiring diagram shown, which of the following statements is
true of a drum switch if the switch is placed in the reverse position?
L1 is connected to T3, L2 is connected to T2, and L3 is connected to T1.
Examine the circuit shown and determine which type(s) of interlocking
is/are shown.
Auxiliary contact and mechanical interlocking
Based on the circuit diagram shown, what will happen to the motor if the
JOG pushbutton is pressed?
The motor will run until the JOG button is released.
An elevator is a common application where motor braking is required.
True
Which of the following is a common method of braking a motor?
Dynamic braking, DC injection braking, Plugging
Which type of braking is commonly used on an elevator?
Electromagnetic
One simple method of plugging a motor is to use a drum switch.
True
Plugging a motor creates a counter torque that stops a motor's rotation.
True
, Which of the following is a disadvantage of plugging a motor?
Plugging creates stress on the motor and its load, Plugging a motor very rarely
brings the motor to a complete standstill, Plugging has limited applications.
Which of the following is not an advantage of plugging a motor?
Plugging does not put stress on the motor.
Once energized, the contacts of a zero speed switch will not deenergize
until the rotation has stopped.
True
An off-delay timer is used instead of a zero speed switch in a time-
controlled plugging circuit.
True
Timer-controlled plugging uses a zero speed switch which has a built-in
timer.
False
Which of the following is a component of an electromagnetic brake?
Coil, Spring, Pressure plate
Which of the following statements best describes an electromagnetic fail-
safe brake?
Spring engaged, electrically releases
One of the advantages of electromagnetic brakes is they are not
dependent on the load.
True
Which of the following is not an advantage of electromagnetic braking?
Efficiency
