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. Putting 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 hall 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