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3rd Year > Commercial Exam Study > Flashcards

Commercial Exam Study Flashcards

1
Q

NMS is national master specification is comprehensive library of construction standards

A

True

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2
Q

How do you motorized zone dampers contribute to energy efficiency in residential HVAC

A

By conditioning the zones only required

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3
Q

What is the purpose of a bypass damper in multi zone residential

A

To relieve pressure and prevent damage to the equipment

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4
Q

What is the purpose of light commercial multi zone equipment

A

Temperature control in each zone 

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5
Q

?

A

?

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6
Q

Why are VAV terminals popular in light construction

A

VAV terminals all for versatility for change easy to move later 

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7
Q

What is the function of a single duct terminal unit in a VAV system and where are they typically found

A

Single duct terminal units supplied condition air constant volume and temperature mostly found in interior zones

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8
Q

What distinguishes Large commercial multi zone equipment from other types of zoning

A

Pressurized loops and different types of vav terminals

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9
Q

How do dual duct non-mixing VAV terminals function and where are they commonly used

A

They use hot and cold ducts adjusting dampers based on temperature needs used in constant airflow like hospitals

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10
Q

What are two main types of HVAC systems discussed in commercial setting

A

CAV
Vav

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11
Q

What are primary types of CAv systems and How are they modified for supply temperature

A

Used in small buildings with reheat coils

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12
Q

What’s the primary benefit of regular vav

A

Precise air amounts reducing consumption for smaller equipment

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13
Q

Single duct vav and there temperatures

A

Volume control dampers and adjusting air flow based on zone thermostat

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14
Q

How do bypass vav systems work

A

Bypass systems conditioned air without going through the occupied space. Not very efficient

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15
Q

Why is make up air needed

A

Prevent negative air so there are no issue trying to open doors , backdraft from gas appliances

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16
Q

Two types of gas fired makeup air units

A

Indirect
And direct

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17
Q

Two types of fans and classes

A

Axial (propeller)
Centrifugal (radial )

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18
Q

How dose air in axial fans work

A

Leaves the fan in the same direction it went in

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19
Q

Characteristics of a propeller fan

A

Low rpm large volume of air with low static pressure

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20
Q

What are cross flow fans and uses

A

They have a crossing pattern used on wall curtains for doors

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21
Q

What temp is going into single duct vav box and what might be added

A

55f and a heating coil

22
Q

What are air extractors

A

Installed in main ducts where splitters can be installed

23
Q

What are some common methods for sound and noise control

A

Silencers , fan isolation mount, sound traps

24
Q

Describe CAV system

A

Supply air flow rate is constant supply air temperature is Varied

25
Q

What’s is buckling

A

Heating and cooling at the same time

26
Q

What happens to the ducts in a high velocity system

A

They are reduced

27
Q

What’s used to slow down air in high velocity

A

Attenuator

28
Q

When low temp enters system. What’s used to heat before it’s conditioned

A

Reheat coil

29
Q

Single VAV systems adjust volume of air entering the space

A

True

30
Q

Dual dock VAV system blends cold and heated air at air handling unit true or false

A

False

31
Q

Vaneaxial fans are what Efficiency

A

Most efficient

32
Q

Thousand CFM of air to remove through duct system it’s a pressure of 0.4 What motor works best

A

Forward curved blade centrifugal

33
Q

What type of blade arrangement is usually use an air pollution high particle loads

A

Radial

34
Q

The most accurate volume control air is obtain by using

A

Oppose blade dumper

35
Q

What type of isolation valves come in pairs

A

Isolation rails 

36
Q

Or additional mass is required what base do you use

A

Inertia bases

37
Q

How are free standing isolators determined

A

Colour coated coil springs to load capacities

38
Q

What is used forFloor isolators

A

Rubber

39
Q

Types of material use for acoustical lining

A

Fibreglass has become the most frequently may use material

40
Q

H

A

N

41
Q

Types of air washers

A

Spray type
Cell type 

42
Q

Dry media filters increase efficiency as they collect material true or false

A

True

43
Q

What’s Merv 

A

Minimum efficiency reporting value

44
Q

When changes are made to original drawings what the changes made called

A

Revisions and addenda

45
Q

Discrepancies in drawings what take president

A

Written specifications

46
Q

What is the most note worthly Between residential and light commercial blueprints

A

Grid lines

47
Q

Where does the intersection of gridlines usually occur

A

Centreline of columns

48
Q

Which callouts are most commonly used for Hvac drawings

A

Grilling defuses


49
Q

Who should be consulted when proposed changes

A

Design engineer

50
Q

Return air should be ducted to one or several return grill

A

Only when combustibles are present

51
Q

When duct is in conditioned space. Is it less of a factor then when it is not

A

Yes

52
Q

The most Important verible in air cleaning

A

Particle size

3rd Year (12 decks)

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