CHAPTER 17

Question 1

To reduce the effect of water hammer, the suction and discharge lines of pumps are often equipped with:
Select one:

A.
None of the above

B.
Check valves

C.
Air chambers

D.
Relief valves

E.
All of the above

Answer 1

E.
All of the above

Question 2

Most traps are designed to discharge any _____ present in the lines or equipment.
Select one:

A.
Oxygen

B.
Steam

C.
Carbon dioxide

D.
Air

E.
Oil

Answer 2

D.
Air

Question 3

The purpose of the steam trap is to discharge water and condensate from steam lines and equipment without:
Select one:

A.
Permitting steam to escape

B.
Permitting corrosion

C.
Letting air enter

D.
Permitting steam to enter

E.
Letting air escape

Answer 3

A.
Permitting steam to escape

Question 4

In one design of a mechanical trap a _____ is used to open and close the trap outlet valve.
Select one:

A.
Bellows

B.
Ball float

C.
Temperature difference

D.
Pressure difference

E.
Bi-metallic strip

Answer 4

B.
Ball float

Question 5

One of the different general classes of traps according to their principle of operation is the _____ trap.
Select one:

A.
Electronic

B.
Electrical

C.
Hydraulic

D.
Mechanical

E.
Pneumatic

Answer 5

D.
Mechanical

Question 6

Before installing a trap blow new lines clear of all:
Select one:

A.
Air

B.
Carbon dioxide

C.
Steam

D.
Condensate

E.
Foreign matter

Answer 6

E.
Foreign matter

Question 7

Using a _____ valve in the bypass line makes it possible to rid the system of condensate by hand throttling while the trap is out of service.
Select one:

A.
Needle

B.
Gate

C.
Ball

D.
Globe

E.
Butterfly

Answer 7

D.
Globe

Question 8

The ball float trap has the disadvantage of being vulnerable to damage from:
Select one:

A.
Water hammer

B.
High steam pressure

C.
High condensate temperature

D.
Air

E.
High steam temperature

Answer 8

A.
Water hammer

Question 9

One of the different general classes of traps according to their principle of operation is the _____ trap.
Select one:

A.
Hydraulic

B.
Pneumatic

C.
Electronic

D.
Thermodynamic

E.
Electrical

Answer 9

D.
Thermodynamic

Question 10

The air present in steam lines and equipment must also be removed to prevent:
Select one:

A.
Corrosion from oxygen

B.
Pitting from carbon dioxide

C.
Rusting from carbon dioxide

D.
Pitting from oxygen

E.
Caustic embrittlement

Answer 10

D.
Pitting from oxygen

Question 11

The purpose of the steam trap is to discharge _____ from steam lines and equipment without permitting steam to escape.
Select one:

A.
Air and steam

B.
Condensate and air

C.
Steam and condensate

D.
Water and condensate

E.
Water and air

Answer 11

D.
Water and condensate

Question 12

One of the different general classes of traps according to their principle of operation is the _____ trap.
Select one:

A.
Electronic

B.
Pneumatic

C.
Electrical

D.
Thermostatic

E.
Hydraulic

Answer 12

D.
Thermostatic

Question 13

As the condensate passes through the trap, the _____ of the bimetal strip increases slightly causing a deflection of the bimetal strip so that the valve can modulate the condensate flow through the trap.
Select one:

A.
Pressure

B.
Density

C.
Velocity

D.
Temperature

E.
Specific gravity

Answer 13

D.
Temperature

Question 14

The operation of the thermostatic trap depends upon the difference in:
Select one:

A.
Pressure between the steam and the condensate

B.
Temperature between the steam and the air

C.
Density between the steam and the condensate

D.
Temperature between the steam and the condensate

E.
Pressure between the steam and the air

Answer 14

D.
Temperature between the steam and the condensate

Question 15

In the design of a mechanical trap a/an _____ is used to open and close the trap outlet valve.
Select one:

A.
Temperature difference

B.
Bellows

C.
Bi-metallic strip

D.
Pressure difference

E.
Inverted bucket

Answer 15

E.
Inverted bucket

Question 16

Always install a _____ just ahead of the trap to prevent the entry of foreign matter.
Select one:

A.
Tee fitting

B.
Gate valve

C.
Strainer

D.
Union

E.
Globe valve

Answer 16

C.
Strainer

Question 17

In a bimetal steam trap, _____ are welded together.
Select one:

A.
Strips of tin

B.
Strips of copper

C.
Strips of iron and constantan

D.
Dissimilar metals

E.
High temperature strips of plastic

Answer 17

D.
Dissimilar metals

Question 18

Water hammer can be described as a series of hammer-blow shocks caused by a sudden change in _____ flowing within a pipeline.
Select one:

A.
Pressure of steam

B.
Velocity of steam

C.
Pressure of water

D.
Velocity of water

E.
Temperature of water

Answer 18

D.
Velocity of water

Question 19

The air present in steam lines and equipment must also be removed to prevent:
Select one:

A.
Caustic embrittlement

B.
Corrosion from oxygen

C.
Corrosion from carbon dioxide

D.
Pitting from carbon dioxide

E.
Rusting from carbon dioxide

Answer 19

B.
Corrosion from oxygen