DDC Study Guide 2B

Question 1

A(n) ___ is a hand-held device that allows access to basic building automation system functions from various controllers

Accepted Answer

portable operator terminal (POT)

Question 2

The _______________ allows the assigning of levels and codes to other individuals.

Accepted Answer

supervisor level

Question 3

A(n) ___ is a device that allows an individual to access and respond to building automation system information.

Accepted Answer

operator interface

Question 4

A pulse width modulated device is a digital output used to position a bi-directional electric motor

Accepted Answer

False

Question 5

A current sensing relay is detects the resistance due to electricity passing through the wire.

Accepted Answer

False

Question 6

Positive temp-coefficient temp sensor _ its output resistance as the temperature increases, and _ its output resistance

Accepted Answer

increases; decreases

Question 7

Optoisolation is a communication method in which controllers use ___ components to prevent communication problems.

Accepted Answer

photonic

Question 8

The ______________ of a thermistor sensor is the amount of resistance change per degree Fahrenhe

Accepted Answer

coefficient

Question 9

A dumb terminal can display ___ lines of information.

Accepted Answer

20 to 60

Question 10

Operator interfaces commonly require installation ___ above the finished floor for viewing by maintenance personnel.

Accepted Answer

60

Question 11

Ethernet is a local area network that can connect up to _ nodes and supports data transfer rates of 10 megabits per sec.

Accepted Answer

1024

Question 12

All building automation system controllers should be wired in accordance with the ___ and local regulations.

Accepted Answer

National Electrical Code® (NEC®)

Question 13

A ___ changes the state of a controlled device in response to a command from a building automation system controller.

Accepted Answer

building automation system output

Question 14

A ______ is a resistor made of semiconductor material in which electrical resistance varies with changes in temperature.

Accepted Answer

thermistor

Question 15

Pulse width modulation (PWM) is a control technique in which a sequence of ___ is used to position an actuator.

Accepted Answer

short pulses

Question 16

A building automation system can send alarms and logs to ___ in addition to off-site PCs.

Accepted Answer

all of the above

Question 17

A point that only exists in software and is not physically hard-wired is called:

Accepted Answer

a pseudopoint.

Question 18

The most common personal computer operating system used today is ___.

Accepted Answer

Microsoft® Windows®

Question 19

Building automation system input is a device that senses and sends building condition information to a controller

Accepted Answer

True

Question 20

The most common humidity sensors measure relative humidity while other sensors measure dewpoint or absolute humidity.

Accepted Answer

True

Question 21

A device that is connected to a personal computer or building automation controller to perform a specific function.

Accepted Answer

peripheral device

Question 22

The network switchboard allowing a number of nodes to communicate with each other is called:

Accepted Answer

a concentrator.

Question 23

A(n) ___ is a device that records the number of occurrences of a signal.

Accepted Answer

accumulator

Question 24

A ___ is a device such as a computer or a printer that has a unique address and is attached to a network.

Accepted Answer

node

Question 25

An adapter card is a card (circuit board) installed in a network component to allow it to communicate with the network

Accepted Answer

True

Question 26

Submasking is a data transmission method where data is sent without frequency modulation.

Accepted Answer

False

Question 27

A concentrator is interconnected equipment used for sending and receiving information.

Accepted Answer

False

Question 28

A configuration with multiple controllers in series is called:

Accepted Answer

a daisy chain network configuration

Question 29

One of the primary reasons for poor customer satisfaction with a building automation system is the ___.

Accepted Answer

lack of effective training

Question 30

The primary desktop PC used to communicate with a building automation system is commonly referred to as the ___.

Accepted Answer

front end

Question 31

A _ normally encompasses 1 business or building and does not require linking a large number of users in remote locations

Accepted Answer

local area network (LAN)

Question 32

Communication between different networks is managed by the:

Accepted Answer

router.

Question 33

A common thermistor nominal value is 1000 ohms at ___°F.

Accepted Answer

70

Question 34

____ is a local area network architecture that can connect up to 1024 nodes and supports data transfer rates of 10 Mbps.

Accepted Answer

Ethernet

Question 35

___ is the cables and other network devices, such as hubs and switches, that make up a network.Hub

Accepted Answer

Physical layer

Question 36

A switch manages the communication between networks or parts of a network that operate at ___ data transmission speeds

Accepted Answer

different

Question 37

A(n) ___ is an address that can change at any time.

Accepted Answer

dynamic address

Question 38

The group of items and functions an operator is permitted to perform is called:

Accepted Answer

an access level.

Question 39

A network address is a unique number assigned to each building automation system controller on a communication network.

Accepted Answer

True

Question 40

Humidity sensors drift over time, with inaccuracies of ___ % per year being common.

Accepted Answer

1

Question 41

In an Ethernet network, data is divided into ___ before being transmitted.

Accepted Answer

packets

Question 42

A dumb terminal is a display monitor and keyboard, with limited processing capabilities.

Accepted Answer

True

Question 43

A circuit with more than 1 point connected to ground, having voltage between the points producing current to ground, is

Accepted Answer

a ground loop

Question 44

A ___ is a temperature-actuated switch.

Accepted Answer

thermostat

Question 45

Controller analog output terminals are commonly labeled ___, and COM.

Accepted Answer

AO 1, AO 2, etc.

Question 46

__ is a multipoint communication incorporates low-impedance drivers and receivers providing high tolerance to noise

Accepted Answer

RS-485

DDC Study Guide 2B

Questions 46

DDC Study Guide 2B

Questions 46