Resistors/PID/Networking

Question 1

A linear resistor’s resistance remains constant when variable voltage is applied.
a. True
b. False

Answer 1

a

Question 2

A variable resistor’s resistance:

a. Is non-adjustable
b. Is adjustable
c. Changes with temperature

Answer 2

b

Question 3

A non-linear resistor is not affected by temperature and light.
a. True
b. False

Answer 3

b

Question 4

What is a potentiometer?

Answer 4

3 terminal resistor that forms voltage divider

Question 5

What is a thermistor sensitive to?

Answer 5

Temperature

Question 6

A Negative Temperature Coefficient (NTC) thermistor’s resistance _____ when subjected to an
increase in temperature

Answer 6

decreases

Question 7

A Positive Temperature Coefficient (PTC) thermistor’s resistance _____ when subjected to an
increase in temperature

Answer 7

increases

Question 8

What type of thermistor is most commonly used as a temperature sensor

Answer 8

NTC

Question 9

What is the purpose of a trimmer potentiometer?

Answer 9

calibrate/fine tune circuits

Question 10

What kind of circuits can a trimmer be used to adjust?

Answer 10

air temp
set-points
2-10v dc

Question 11

What is the purpose of a thermostat heat anticipator

Answer 11

adds internal heat to trick thermostat

Question 12

Is the heat anticipator of a thermostat is wired in series or parallel with the burner control
circuit?

Answer 12

series

Question 13

What should the thermostat’s heat anticipator be set to?

Answer 13

amount of current the control circuit is generating

Question 14

What type of feedback does a proportional control use

Answer 14

linear

Question 15

What does PID stand for in a proportioning control system

Answer 15

proportional, integral, derivative

Question 16

What type of power source is used in a 4-20 mA proportional system

Answer 16

direct current

Question 17

In a 0-10 VDC system it is necessary to use shielded twisted pair cable. true or false

Answer 17

true

Question 18

What type of protocol does a Modbus system use?

Answer 18

master/slave

Question 19

What type of system can Modbus be found in?
Burner management system (BMS)
Building Automation and Control Systems (BACS)
Boiler/hydronic control systems
all of the above

Answer 19

all of the above

Question 20

What is BACnet?

Answer 20

a communication protocol for building automation

Question 21

What can BACnet control? (3)

Answer 21

HVAC
lighting
buiding emergency controls

Question 22

BACnet protocol makes it possible to integrate products from different manufacturers into one
project.

a. True
b. False

Answer 22

true

Question 23

An application that LON can control is street lighting.
a. True
b. False

Answer 23

a

Question 24

What does WiFi stand for?

Answer 24

wireless fidelity

Question 25

WiFi uses wires to send signals between devices.
a. True
b. False

Answer 25

false

Question 26

What frequency ranges does WiFi use?

Answer 26

2.4-5ghz

Question 27

Bluetooth can be used for Connection of motion controllers to a PC when using VR headset. true or false

Answer 27

true

Question 28

A communications satellite creates a communication channel between a source transmitter and
a receiver at different locations on Earth. True or False?

Answer 28

True

Question 29

What can a communications satellite be used for?

Television
Radio
Internet
all of the above

Answer 29

all of the above

Question 30

What is an alternative system for internet when a broadband system isn’t available in a remote
location?

Answer 30

A satellite system

Question 31

What is a cellular network?
a. A communication network where the last link is wired
b. When jail cells are connected in series
c. A landline phone system
d. A communication network where the last link is wireless

Answer 31

d

Question 32

What is a “cell” in a cellular network?
a. A fixed-location transceiver
b. A variable-location transceiver
c. A communication extended listening locator
d. A geosynchronous orbit communication satellite

Answer 32

a