Smart Sensor Logic 1.1-1.3

What type of material can an inductive proximity sensor sense?

A: Peanut butter

B: Any kind of material

C: Plastic

D: Ferrous metal

D: Ferrous metal

Where are input devices located on a ladder diagram?

A: Right side

B: Left side

C: Middle

D: only on the last rung

B: Left side

Two normally closed push buttons are wired in parallel with each other. What type of logic is this?

A: AND

B: NAND

C: Memory

D: OR

B: NAND

Devices called ___ often serve as the brains of an automated machine.

A: Switches

B: Latches

C: Relays

D: Power Supplies

C: Relays

Which one of the following logic elements describes a circuit with two normally open switches in series?

A: OR

B: NAND

C: AND

D: NOT

C: AND

How should a retro reflective sensors target be oriented with the sensor's beam?

A: Above

B: Below

C: Parallel

D: Perpendicular

D: Perpendicular

Which of the following describes ladder diagrams?

A: It only displays power devices

B: It only displays input devices

C: It only shows control devices

D: It shows the high side of the diagram

C: It only shows control devices

A sensor is using a sinking output. What will the voltage be on the output of the sensor when it is activated?

A: Equal to the source voltage

B: Higher than the source voltage

C: 0 Volts

D: 24 Volts

C: 0 Volts

A SPST magnetic reed switch has _____ wire connections

A: Two

B: Three

C: Four

D: Five

A: Two

Which type of logic element uses a control relay?

A: NAND

B: OR

C: Memory

D: NOT

C: Memory

Why is optical isolation needed for an input device?

A: Overload protection

B: To protect it from electrical interference

C: To prevent large amounts of resistance

D: To protect against current draw

B: To protect it from electrical interference

An inductive proximity sensor uses the principle of _____ to sense metal objects.

A: Inductance

B: Capacitance

C: Resistance

D: Ohm's Law

A: Inductance

Which of the following materials can a capacitive sensor detect at the greatest distance?

A: Metal

B: Wood

C: Rubber

D: Paper

A: Metal

NOT logic is formed by _____.

A: Two normally closed switches

B: Two normally open switches

C: One normally open switch

D: One normally closed switch

D: One normally closed switch

Which of the following is measured when testing a Hall effect sensor as the target is moved?

A: Magnetic field

B: Sensor output voltage

C: Sensor input resistance

D: Sensor input voltage

B: Sensor output voltage

Which of the following can be tested with a DMM with the power ON?

A: Resistance

B: Voltage

C: Continuity

D: Frequency

B: Voltage

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 reading across the coil leads.

B: Set the meter for DC volts and check the readings across the coil leads

C: Set the meter for frequency and check the reading across the coil leads

D: Set the meter for AC volts and check the reading across the coil leads

A: Set the meter for ohms (resistance) and check the reading across the coil leads.

Which of the following is not a common electronic sensor?

A: Photoelectric sensor

B: Inductive proximity sensor

C: Capacitive proximity sensor

D: None of the above

D: None of the above

Which of the following is a factor that can have an effect on the performance of the a photoelectric sensor?

A: Target size

B: Sensor beam angle

C: Target reflectivity

D: All of the above

D: All of the above

A three wire capacitive sensor uses two wires connected to the power source. What is the third wire connected to?

A: Ground terminal

B: Controller input terminal (PLC)

C: Controller output terminal (PLC)

D: We cut it off because it is not needed

B: Controller input terminal (PLC)

A two wire sensor is connected in which of the following? How is it connected in the circuit?

A: Power supply terminal and ground

B: Power Supply terminal and power supply

C: Controller input terminal and power supply

D: Positive and Negative

C: Controller input terminal and power supply

How should you read a ladder diagram?

A: Bottom to top

B: Left to left

C: Left to right, top to bottom

D: Side to side, bottom to top

C: Left to right, top to bottom

Which of the following are how electronic sensors are different from limit switches?

A: Electronic sensors react slower than limit switches

B: Electronic sensors react faster than limit switches

C: Limit switches are only normally open

D: Electronic Sensors do not last as long as limit switches

B: Electronic sensors react faster than limit switches

What test can you do with a switch out of circuit.

A: Check voltage

B: Check amps

C: Check power

D: Check resistance

D: Check resistance

This button located on a Directional Control Valve is called?

A: Selector Switch

B: Automatic switch

C: Manual override

D: Thermostat

C: Manual Override

Which of the following does a Hall Effect sensor sense?

A: Metal

B: Resistance

C: Magnetic Field

D: Water

C: Magnetic Field

Capacitive sensors are able to detect what types of material?

A: Plastic

B: Metal

C: Steel

D: Any type

D: Any type

A yellow indicator lamp is?

A: Input

B: Output

C: Both

D: Neither

B: Output

Outputs on a ladder diagram are wired in _____.

A: Parallel with each other

B: Series with each other

C: Can I phone a friend?

D: None of the above

A: Parallel with each other

Magnetic reed switches are used in what type of circuit?

A: High Current

B: AC only

C: DC only

D: AC and DC circuits

D: AC and DC circuits

Magnetic reed switches are only used in high current circuits.

A: True

B: False

B: False

A coil is considered to be a _____?

A: NOPB

B: S.S

C: Motor

D: Output

D: Output

A photoelectric sensor uses the principle of _____ to activate it.

A: Mutual inductance

B: Impedance

C: Photoconduction

D: Capacitance

C: Photoconduction

An inductive proximity sensor can detect metallic and non-metallic objects.

A: True

B: False

False