Kaplan- Lesson 5: Mechanical Equipment and Energy Codes

Question 1

HVAC equipment consists of what two basic elements?

Answer 1

The plant and the distribution system

Question 2

What are the three basic categories of distribution systems?

Answer 2

Electrical, Hydronic, & Forced Air

Question 3

What kind of distribution system is the lowest in first cost and the most expensive in life-cycle costs?

Answer 3

Electrical

Question 4

A hydronic system that has a single supply and return pipe is called a….

Answer 4

Single Pipe System

Question 5

How is a two pipe system different that a single pipe hydronic system?

Answer 5

It has separate supply and return pipes

Question 6

The temperature of the air as it leaves the equipment room is called the equipment temperature or the _________.

Answer 6

deck temperature

Question 7

How does a fan coil system work in forced air distribution?

Answer 7

A constant volume of air is supplied from the plant in a single duct. A chilled water and hot water pipe are also supplied. At each zone there is a unit with a fan and two coils. The air is blown over the coils into the room.

Question 8

The most common efficient forced air system is?

Answer 8

The Variable Air Volume (VAV) system

Question 9

Where are unitary systems beneficial?

Answer 9

When the building plan is spread out and too costly to duct. There can be one unit for each zone with a unit placed on the roof or in a cabinet.

Question 10

Any system in which a small amount of supply air at a very high velocity is delivered to a box-like unit and mixed with air brought in from the room.

Answer 10

Induction

Question 11

The floor space required for the mechanical equipment is usually ______ percent of the total floor area of the building.

Answer 11

5- 10%

Question 12

1 ton of cooling is equivalent to…

Answer 12

12,000 BTUh

which would melt a ton of ice over a 24-hour period.

Question 13

T/F The most efficient duct is the one with the greatest perimeter.

Answer 13

F- The most efficient duct is the one with the least perimeter since that results in the least resistance to air movement and the least friction.

Question 14

What is static head?

Answer 14

The friction loss expressed in inches of water per 100 feet.

Question 15

What are the two basic types of energy codes?

Answer 15

Prescriptive and Performance Codes

Question 16

A _____ code specifies how to build a building.

Answer 16

Prescriptive

Question 17

A _____ code states what the final results need to be and how it will be measured, but does not specify how that result will be achieved.

Answer 17

Performance

Question 18

A weighted average of U-value for all of the exterior surfaces of a building is called?

Answer 18

Overall Thermal Transmission Value (OTTV)

Question 19

An organized process to ensure that all building systems perform interactively according to the intent of the architectural and engineering design, and the owners operating needs.

Answer 19

Commissioning

Question 20

Which of the following systems can be combined with a four pipe hydronic system?

A. Double duct system
B. Multizone system
C. Fan coil system
D. Unitary system

Answer 20

C. Fan coil system

Question 21

All of the following are capable of reversing the otherwise invariant flow of heat from hotter to cooler objects, EXCEPT

A. the heat pump system
B. the variable air volume system
C. the refrigeration system
D. the evaporative chiller

Answer 21

B. the variable air volume system

Question 22

Which of the following systems can provide simultaneous heating and cooling to different rooms within the same zone?

I. Single duct constant volume with electric reheat system
II. Double duct system
III. Fan coil system

A. I & II
B. II & III
C. I & III
D. I, II, & III

Answer 22

D. I, II, & III

Question 23

Which of the following uses the latent heat of evaporation to transfer heat?

A. evaporative chiller
B. multizone system
C. unitary system
D. variable air volume system

Answer 23

A. evaporative chiller

Question 24

Which of the following systems can be used if each zone must have a separate utility bill>

I. Unitary system
II. Heat pump system
III. Double duct system

A. I & II
B. II & III
C. I & III
D. I, II, & III

Answer 24

A. I & II

I. Unitary system
II. Heat pump system

Question 25

Which system uses a heat sink and often balances itself without utilizing a boiler or chiller?

A. Unitary system
B. Multizone system
C. Heat pump system
D. Variable air volume system

Answer 25

C. Heat pump system

Question 26

Which part of the refrigeration cycle is the hottest?

A. Evaporator
B. Compressor
C. Condenser
D. Valve

Answer 26

C. Condenser

Question 27

Which of the following hydronic systems are parallel? Check all that apply.

A. One pipe
B. Two pipe
C. Three pipe
D. Four pipe

Answer 27

B. Two pipe
C. Three pipe
D. Four pipe

Question 28

Which of the following hydronic systems can provide both heating and cooling simultaneously?

I. One pipe
II. Two pipe
III. Three pipe
IV. Four pipe

A. I & II
B. II, III, & IV
C. III & IV
D. I, II, III, & IV

Answer 28

C. III & IV

III. Three pipe
IV. Four pipe

Question 29

Where does return air go?

A. to the plant
B. to the outside of the building
C. to the room that requires air at that temperature
D. to the exhaust flue

Answer 29

A. to the plant