Questions On Review 11-20

Question 1

What is hard forming scale

Silica

Chlorine

Passive

Answer 1

Silica

Question 2

Which chemicals are used to combat scale

Combine phosphate treatment

Sodium sulfite and hydrozine

Calcium carbonate

Answer 2

Combine phosphate treatment

Question 3

What mechanical devices is used to remove scale from fire tube

Answer 3

A tube rattle or vibrador

Question 4

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

Answer 4

A tube turbine

Question 5

In a duct air handling system, space thermostat control building temperature by

Resetting the air handler hot and cold deck temperature

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

Control a reheat coil located in the duct serving the soace

Answer 5

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

Question 6

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

Varying the air volume to the zone

Modulating the heating and cooling coil control

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

Answer 6

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

Question 7

What is the area of a steam engine cylinder reading 10 x 24, when the piston is only traveling at 2/3 of the way

Answer 7

160

Question 8

What is meant by the percentage of (skip, step, and slip) in a pump

Difference in the efficiency of the drive motor

The difference in the theoretical capacity compared to the actual capacity

Answer 8

The difference in the theoretical capacity compared to the actual capacity

Question 9

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

Friction head

Static discharge head

Static suction head

Answer 9

Static suction head

Question 10

Where is a system is a foot valve value installed and what is its purpose

A valve operated by your foot in order to prime a centrifugal pump

A type of check valve located below the normal level of the tank. Attached to the end of the suction line of the pump, use to keep suction line full to facilitate starting

Answer 10

A type of check valve located below the normal level of the tank. Attached to the end of the suction line of the pump, use to keep suction line full to facilitate starting