Chapter- 40-59

Question 1

With hydroxide present and normal oxygen levels which chemicals will cause problem?

Answer 1

Chlorine

Question 2

What mechanical device is used to remove scale from fire tube?

Answer 2

A tube rattler or vibrator

Question 3

Who can make adjustments or repairs on a safety valve

Answer 3

A qualified person from manufacture or representative

Question 4

What mechanical device is used to remove scale from water tube?

Answer 4

A tube turbine

Question 5

In a duct air handling system space thermostat control building temperatures by?

Answer 5

Mixing the air from hot and cold duct in a mixing box serving the space

Question 6

The removal of moisture from air using a cooling coil is called_________dehumidification?

Answer 6

Passive

Question 7

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

Answer 7

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

Question 8

An air handler unit that has hot and cold air duct connected to molding boxes located in each building space is called a_______air handler unit

Dula duct

multi zone

Single zone

Terminal reheat

Answer 8

Dual duct

Question 9

An air handler unit supplies a constant supply air temperature of 55 degrees f to building spaces and includes a coil called______air handler unit

An induction

A terminal reheat

A constant volume

Answer 9

A terminal reheat

Question 10

An air handler unit that provides heating, ventilation, and air conditioning to more than one building or area and has its cooling and heating coil in separate side by side ducts is called a ______air handling unit

Dual duct

Multi zone

Single zone

Answer 10

Multi zone

Question 11

In a dual duct air handling system space thermostatic control building temperature by

Answer 11

Moving the air from the hot and cold duct in a molding box serving space

Question 12

A boiler is rated at 86,250 of steam per hour, what is the equivalent boiler horsepower.

86,250 divided by

Answer 12

2500

Question 13

What is the total force acting on a 4 inches diameter safety valve disc with a boiler pressure of 12 psi

12 x 4 x 4 x 0.7854

Answer 13

150.79

Question 14

The expansion tank on a closed loop system should be located?

Answer 14

On the suction side of the pump

Question 15

What is the primary purpose of a crank case heater on a reciprocating chiller?

Answer 15

To prevent refrigeration migration

Question 16

What is meant by the percent of skip, step, and slip in a pump

Answer 16

Percentage of flow, minimum speed and full speed

Question 17

Which of the following types of pumps can be started with the discharge valve closed

Answer 17

Centrifugal

Question 18

The vertical distance from the center line of the pump up to top level of the supply tank is called?

Answer 18

Static suction head