chapter 17

Question 1

A disadvantage of the ball float trap is:

a)Tends to become water logged
b)Tends to be air-locked on start-up
c)Vulnerable to damage from water hammer
d)Requires a minimum level of TDS for buoyancy

Answer 1

c

Question 2

The small amount of piping before the steam trap is known as the:

a) warming leg
b) cooling leg
c) trap run-up
d) inlet piping

Answer 2

b

Question 3

Water hammer can be caused by

a)Refrigerant vapour in the evaporator
b)The sudden stopping of motor-driven pump
c)The design of a two-pipe steam heating system
d)Air in condensate piping

Answer 3

b

Question 4

Thermostatic steam traps operate on the difference in temperature between steam and:

a)The volatile fluid
b)Condensate
c)Room air
d)Boiler Water

Answer 4

b

Question 5

The F&T steam trap is characterized by:

a)The tendency to become air locked
b)The ability to withstand water hammer
c)The ability to discharge condensate as soon as it is received
d)The tendency to return condensate in pulses

Answer 5

c

Question 6

Radiator traps may operate on the power of a:

a)Diaphragm
b)Bimetallic strip
c)Bucket
d)float

Answer 6

b

Question 7

In an inverted bucket trap, _________ forms a seal that prevents the loss of live steam

a)Air
b)CO2
c)Live steam
d)Condensate

Answer 7

d

Question 8

The F&T steam trap works well whether the condensate load is light or heavy

True
False

Answer 8

true

Question 9

To prevent water hammer in piping carrying pumped fluid, ______________ are often used

a) air chambers
b) globe valves
c) check valves
d) gate valves

Answer 9

a

Question 10

Which of the following are steam traps?

a) Thermodynamic
b) Thermostatic
c) Mechanical
d) All of the above

Answer 10

d

Question 11

In an inverted bucket trap, _________ forms a seal that prevents the loss of live steam

a) Live steam
b) Air
c) Condensate
d) CO2

Answer 11

c

Question 12

A globe valve:

a) has a machined centre bore
b) should be operated either fully open or fully closed
c) is used to throttle flow
d) has less restriction in line than a gate valve

Answer 12

c

Question 13

The F&T steam trap is characterized by:

a) The tendency to return condensate in pulses
b) The ability to withstand water hammer
c) The tendency to become air locked
d) The ability to discharge condensate as soon as it is received

Answer 13

d

Question 14

Water hammer can be caused by

a) Air in condensate piping
b) The design of a two-pipe steam heating system
c) Air in a hot water heating system
d) The sudden stopping of motor-driven pump

Answer 14

d

Question 15

The bucket in the inverted bucket style steam trap rises when the trap is fills with

a) steam
b) air
c) condensate
d) non-condensible gases

Answer 15

a

Question 16

Gate, globe, and ball valves reach _______% of their flow capacity when 20% open

a) 90
b) 70
c) 20
d) 50

Answer 16

b

Question 17

which of the following are types of traps

a. thermodynamics
b. thermostatic
c. mechanical
d. all of above

Answer 17

d

Question 18

as steam enters an inverted bucket steam trap, it will ________, giving it bouyancy and cause the bucket to rise

a. release air
b. collect at the top of the inverted bucket
c. increase in temp
d. condense

Answer 18

b

Question 19

in a bimetal steam trap, ________are welded togeather

a. dissimilar metals
b. strips of copper
c. strips of tin
d. high temp strips of plastic

Answer 19

a

Question 20

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. gate
b. globe
c. needle
d. ball

Answer 20

b

Question 21

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

a. check valves
b. relief valves
c. air chambers
d. all of the above

Answer 21

d

Question 22

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

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

Answer 22

c

Question 23

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

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

Answer 23

a

Question 24

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

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

Answer 24

a

Question 25

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

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

Answer 25

c

Question 26

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

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

Answer 26

a

Question 27

In a bimetal steam trap, _____ are welded together.

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

Answer 27

a

Question 28

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

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

Answer 28

d

Question 29

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

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

Answer 29

e

Question 30

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

A.Water and air
B.Air and steam
C.Steam and condensate
D.Water and condensate
E.Condensate and air

Answer 30

E

Question 31

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.Specific gravity
B.Density
C.Velocity
D.Pressure
E.Temperature

Answer 31

e