AEA - C-205 Quiz 1
Which of the following measurement(s) should be taken to test an inductive proximity switch?
B) Input and Output voltages
Which of the following will trigger a magnetic reed switch?
C) Magnet
Which one of the following logic elements describes a circuit with two normally open switches in series?
A) AND
OR logic is formed by __________.
C) Two normally open switches in parallel
Which of the following is measured when testing a Hall effect sensor as the target is moved?
C) Sensor output voltage
Why is optical isolation needed for an input device?
C) To protect it from electrical interference
Which type of logic element uses a control relay?
B) MEMORY
An on-delay timer relay's contacts will not change states until __________.
D) A predetermined time has elapsed
The button located on a Directional Control Valve is called?
A) Manual Override
Which of the following statements is not true of a ladder diagram?
C) It can have more than one output device on each rung.
How should a retro reflective sensors target be oriented with the sensor's beam?
B) Perpendicular
Which of the following is not a common electronic sensor?
D) None of the above
NOT logic is formed by __________.
B) One normally closed switch
Devices called __________ often serve as the brains of an automated machine.
C) Relays
A sensor is using a sinking output. What will the voltage be on the output of the sensor when it is activated?
D) O volts
Which of the following does a Hall effect sensor sense?
C) Magnetic field
An inductive proximity sensor uses the principle of __________ to sense metal objects.
D) Inductance
What type of material can an inductive proximity sensor sense?
C) Ferrous metal
Two normally closed push buttons are wired in parallel with each other. What type of logic is this?
B) NAND
Which of the following elements describes two or more normally closed switches in series?
D) NOR
Which of the following is not a component of a limit switch?
C) Optical sensor
A SPST magnetic reed switch has _____ wire connections
D) 2
Which of the following is an element of control logic?
D) All of the above
An inductive proximity sensor can detect metallic and non-metallic objects.
How should a technician read a ladder diagram?
B) Left to right and top to bottom.
Witch of the following reasons is why an input device should have optical isolation?
D) Electrical noise protection.
What test can you do with a switch out of circuit?
D) Check resistance
Two normally closed push buttons are wired in parallel with each other. What type of logic is this?
B) NAND
Where are input devices located on a ladder diagram?
B) Left side
A SPST magnetic reed switch has _____ wire connections
A) 2
A three wire capacitive sensor uses two wires connected to the power source. What is the third wire connected to?
B) Controller input terminal
Outputs on a ladder diagram are wired in _______.
A) Parallel with each other
Which of the following describes Ladder diagrams?
C) It only shows control devices
Devices called __________ often serve as the brains of an automated machine.
C) Relays
Which of the following is not a common electronic sensor?
D) None of the above
How should a retro reflective sensors target be oriented with the sensor's beam?
D) Perpendicular
Which one of the following logic elements describes a circuit with two normally open switches in series?
C) AND
When testing a control relay, one must isolate it from the circuit. Which of the following is the next step in this process?
A) Set the meter for ohms (resistance) and check the readings across the coil leads
Which of the following materials can a capacitive sensor detect at the greatest distance?
A) Metal
Which type of logic element uses a control relay?
C) Memory
B) Green
D) Left
An inductive proximity sensor can detect metallic and non-metallic objects
B) False
Capacitive sensors are able to detect what types of material
D) Any Type
A photoelectric sensor uses the principle of ________ to activate it.
C) Photoconduction
An inductive proximity sensor uses the principle of _______ to sense metal objects
A) Inductance
Why is Optical isolation needed for an input device?
B) To protect it from electrical interference
B) No
What type of material can an inductive proximity sensor sense?
D) Ferrous Metal
4) PB4
A coil is considered to be a __________?
D) Output
A yellow indicator lamp is?
B) Output
Which of the following is measured when testing a Hall effect sensor as the target is moved?
B) Sensor output voltage
Which of the following can be tested with a DMM with power ON?
B) Voltage
Magnetic reed switches are used in what type of circuit?
D) AC and DC circuits
D) To Seal in PB1
Pg 15
Control Relays
"Memory logic is used to keep an output energized after the input signal that turned it on has been removed. "
Which of the following are how electronic sensors are different from limit switches?
B) Electronic sensors react faster than limit switches
A two wire sensor is connected in which of the following? How is it connected in the circuit?
C) Controller input terminal and power supply
NOT logic is formed by ________.
D) One normally closed switch
Which of the following does a Hall Effect sensor sense?
C) Magnetic Field
Which of the following is a factor that can have an effect on the performance of a photoelectric sensor?
D) All of the Above
How should you read a ladder diagram
C) Left to right, Top to Bottom
The button located on a Direction Control Valve is called?
C) Manual Override
D) Limit Switch
A sensor is using a sinking output. What will the voltage be on the output of the sensor when it is activated?
C) 0 Volts
A) AND
The speed of an AC motor depends on the __________ of the incoming power.
B. Frequency
When AC voltage is removed from a motor and then DC current is injected, what is the result?
C. Braking
Which of the following parameters for VFD's are usually organized into what type of groups?
B. Functions
If the skip frequency of a VFD is set at 30 Hz and the skip band is 6 Hz, what range of frequencies will the VFD skip?
D. 27 Hz to 33 Hz
VFD programmable settings are called what?
C. Parameters
What is the primary function of a VFD?
A. To control the speed of an electric motor
Which mode would you select on the VFD to control a motor from the VFD key pad only?
B. Local
To control a motor, the VFD modifies frequency and what else?
D. Voltage
If you wanted to increase the motor torque at low frequencies, which parameter in the VFD would you change?
D. Low speed Boost
Which of the following would you use for the stop signal to a VFD?
B. Momentary pushbutton with normally closed contacts
Many VFDs can be programmed to output preset __________ based on different combinations of inputs.
B. Frequencies
A VFD produces what abbreviated type of Waveform?
D. PWM
What type of load is a variable frequency drive typically used for?
B. Inductive loads
When ramping above a motor's base speed, the acceleration time should be __________ to avoid an overload.
C. Longer
If the VFD is only designed to run in the forward direction, how many VFD inputs need to be wired to the PLC output module for 3-wire control of the VFD?
B. 2
If a fault code is not displayed on the VFD, but the motor still will not run after the start button is pressed, which of the following is the most likely cause?
C. Start button contacts are bad
If the motor is stopped and a PLC sends a momentary signal (turns on then off) to the VFD’s forward input, what will happen after that signal is received by the VFD?
A. The motor will run continuously in the forward direction
Certain frequencies from a VFD can cause a motor to run rough or vibrate.
A 2-pole motor can operate at 125% its rated speed, while a 4-pole motor can operate as high as __________.
C. 200%
A VFD will reset itself automatically under which condition?
B. Under-voltage
When does the manufacturer recommend you use a S-curve acceleration motion profile setting in a VFD?
D. Low or high inertia
When ramping up, a VFDs average power output __________.
B. Increases
If the signal from the PLC to the VFDs forward input went from on to off on a 2-wire control, what would happen?
D. The motor stops
What starting torque can be achieved using a VFD to control a motor?
D. Over 100%
What parameter determines how fast a motor slows down when going from a high speed to a low speed?
B. Deceleration time
Abruptly removing voltage from the motor terminals will cause the motor to __________ to a stop.
B. Brake
Which of these is a type of VFD parameters?
C. Communications
DC injection braking is used to quickly __________ an AC induction motor.
A. Stop
If you operate a VFD at a speed higher than its base speed, what would happen to the torque?
D. It would decrease
Ethernet/IP is a common communication method on VFD’s. What other communication method is commonly available on VFD’s?
A. RS-485 serial
If you wanted to use a Start push button, Stop push button and a Fwd/Rev direction selector switch to control a VFD, what steps would have to be taken?
B. Program the VFD for 3-wire control mode
VFDs are designed to maintain a constant Volts per Hz ratio to accomplish what?
B. To keep the torque constant at different loads
The __________ stage of a VFD changes AC power into DC power.
C. Rectifier
What would you commonly use a potentiometer wired to a VFD for?
â’¸ To adjust the speed of a motor
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