Book 1: 5-17 - Steam Traps

Question 1

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

A. Electronic
B. Hydraulic
C. Pneumatic
D. Mechanical
E. Electrical

Answer 1

D. Mechanical

Question 2

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

A. Electrical
B. Pneumatic
C. Thermostatic
D. Electronic
E. Hydraulic

Answer 2

C. Thermostatic

Question 3

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

A. Corrosion from oxygen
B. Pitting from carbon dioxide
C. Pitting from oxygen
D. Rusting from carbon dioxide
E. Caustic embrittlement

Answer 3

C. Pitting from oxygen

Question 4

In the design of a mechanical trap a/n _____ is used to open and close the trap outlet valve.

A. Bellows
B. Inverted bucket
C. Pressure difference
D. Bi-metallic strip
E. Temperature difference

Answer 4

B. Inverted Bucket

Question 5

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.

A. Pressure
B. Velocity
C. Specific Gravity
D. Temperature
C. Density

Answer 5

D. Temperature

Question 6

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

A. Temperature difference
B. Bi-metallic strip
C. Bellows
D. Pressure difference
E. Ball float

Answer 6

E. Ball float

Question 7

In a bimetal steam trap, _____ are welded together.

A. Strips of tin
B. High temperature strips of plastic
C. Strips of copper
D. Dissimilar metals
E. Strips of iron and constantan

Answer 7

D. Dissimilar metals

Question 8

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

A. High condensate temperature
B. High steam pressure
C. Water hammer
D. High steam temperature
E. Air

Answer 8

C. Water hammer

Question 9

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.

A. Needle
B. Butterfly
C. Globe
D. Ball
E. Gate

Answer 9

C. Globe

Question 10

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

A. Permitting steam to escape
B. Permitting steam to enter
C. Permitting corrosion
D. Letting air escape
E. Letting air enter

Answer 10

A. Permitting steam to escape

Question 11

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. Temperature of water
C. Pressure of water
D. Velocity of steam
E. Velocity of water

Answer 11

E. Velocity of water

Question 12

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. Water and condensate
C. Condensate and air
D. Steam and condensate
E. Water and air

Answer 12

B. Water and condensate

Question 13

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

Select one:

A. Pitting from carbon dioxide
B. Caustic embrittlement
C. Corrosion from oxygen
D. Rusting from carbon dioxide
E. Corrosion from carbon dioxide

Answer 13

E. Corrosion from carbon dioxide

Question 14

Always install a ______ just ahead of the trap to prevent the entry of foreign matter.

Select one:

A. Gate valve
B. Strainer
C. Union
D. Tee fitting
E. Globe valve

Answer 14

B. Strainer

Question 15

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

Select one:

A. Check valves
B. All of the above
C. Relief valves
D. Air chambers
E. None of the above

Answer 15

B. All of the above

Question 16

Before installing a trap blow new lines clear of all:

Select one:

A. Carbon dioxide
B. Air
C. Steam
D. Foreign matter
E. Condensate

Answer 16

D. Foreign matter

Question 17

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. Hydraulic
E. Thermodynamic

Answer 17

E. Thermodynamic

Question 18

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

Select one:

A. Temperature between the steam and the condensate
B. Pressure between the steam and condensate
C. Temperature between the steam and the air
D. Density between the steam and the condensate
E. Pressure between the steam and the air

Answer 18

A. Temperature between the steam and the condensate

Question 19

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

Select one:

A. Oil
B. Air
C. Oxygen
D. Steam
E. Carbon dioxide

Answer 19

B. Air

Question 20

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

Select one:

A. Inverted bucket
B. Temperature difference
C. Bellows
D. Bi-metallic strips
E. Pressure difference

Answer 20

A. Inverted bucket