Chapter- 60-79

Question 1

In a multi-zone air handling unit the zone thermostat controls the zone temperature by?

Answer 1

Dampers that control the air flow from the hot and cold deck

Question 2

What is meant by a pump becoming steam bound?

Answer 2

When the static pressure at the suction of the pump falls below the vapor pressure corresponding to its temperature

Question 3

Which of the following is a positive displacement pump

Answer 3

Reciprocating

Question 4

What does the whistle on the top of the water column indicating

Answer 4

High and low water condition

Question 5

The heart of a refrigeration system is the

Answer 5

Compressor

Question 6

Refrigerant flow into the evaporator is controlled by_____

Answer 6

A metering device

Question 7

The part of the refrigeration system the absorbs heat into the system is controlled by the

Answer 7

Evaporator

Question 8

A replacement refrigerant for R-12 medium and high temperature refrigeration application is

123 A

134 A

410 A

Answer 8

134 A

Question 9

The color for an R-134 a refrigerant cylinder is

Answer 9

Light blue

Question 10

The color for an R-410 a refrigerant cylinder is

Answer 10

Rose

Question 11

What do you use to bank off a boiler and bring it back online without using the shut off valve

Answer 11

Automatic stop valve

Question 12

What is not advantage of an economic boiler over convectional HRT Boiler

Answer 12

Space, ability to increase capacity, flexibility

Question 13

What do you call the chemicals are used to test water treatment test for hardness is

Answer 13

Reagents

Question 14

What are the three “T” of combustion stand for

Answer 14

Time, temperature, turbulence

Question 15

What do you do to attain complete combustion in a boiler

Answer 15

Increase secondary air

Question 16

Air leaking into the inner and outer of the boiler l, what will happen

Answer 16

Decrease boiler efficiency