BOILER SAFETY DEVICES CHAPTER
3 - WATER LEVEL CONTROLS EXAM
QUESTIONS & VERIFIED CORRECT
ANSWERS
If shut-off valves are installed on a water column, they must be sealed in the open
position, and must be ___________ valves:
a. Outside screw and yoke rising spindle gate
b. Inside screw and yoke rising spindle gate
c. Non-rising spindle gate
d. Outside screw and yoke rising spindle globe
e. Rising spindle globe - CORRECT ANSWER a
Tubular gauge glasses should not exceed _________ mm in length.
a) 250
b) 500
c) 750
d) 1000 - CORRECT ANSWER c
A.S.M.E code requires that, for a firetube boiler, the bottom of the gauge glass must be
____________ mm above the top row of firetubes, flue, or crownsheet, to prevent
overheating.
a) 50
b) 76
c) 100
d) 125 - CORRECT ANSWER B
How many try cocks are installed on the water column of a boiler, with over 9.3 square
meters of heating surface?
a) 1
b) 2
c) 3
d) 4
e) 6 - CORRECT ANSWER c
The purpose of a bowl at the bottom of the water colum is to:
, a) serve as a condenser
b) serve as a sediment chamber
c) serve as a siphon
d) as a reservoir
e) none of the above - CORRECT ANSWER b
Separately mounted gauge glasses are used to provide a _______ indication of level
over a certain vertical distance on the vessel:
a) point
b) continuous
c) diagonal
d) ultrasonic
e) indirect - CORRECT ANSWER b
In a high pressure horizontal firetube steam boiler, the bottom of the gauge glass should
be ____________ above the lowest permissible water level in the boiler.
a) 1 m
b) 50 cm
c) 47 cm
d) 25.4 mm
e) 51 mm - CORRECT ANSWER e
If a gauge glass breaks, the first action by the operator should be to:
a) close the gauge glass isolation valves
b) call his supervisor
c) shut down the boiler
d) place the spare gauge glass in service - CORRECT ANSWER a
For pressure above 2800 kPa a gauge glass housing is constructed of:
A) cast iron
B) brass
C) steel
D) aluminum
E) stainless steel - CORRECT ANSWER c
A great advantage of an Igema level indicator over a Hopkinson unit is:
a) it has the highest degree of accuracy
b) it is the least costly to purchase
c) its ability to show steam and water as different colors
d) there are no moving parts
3 - WATER LEVEL CONTROLS EXAM
QUESTIONS & VERIFIED CORRECT
ANSWERS
If shut-off valves are installed on a water column, they must be sealed in the open
position, and must be ___________ valves:
a. Outside screw and yoke rising spindle gate
b. Inside screw and yoke rising spindle gate
c. Non-rising spindle gate
d. Outside screw and yoke rising spindle globe
e. Rising spindle globe - CORRECT ANSWER a
Tubular gauge glasses should not exceed _________ mm in length.
a) 250
b) 500
c) 750
d) 1000 - CORRECT ANSWER c
A.S.M.E code requires that, for a firetube boiler, the bottom of the gauge glass must be
____________ mm above the top row of firetubes, flue, or crownsheet, to prevent
overheating.
a) 50
b) 76
c) 100
d) 125 - CORRECT ANSWER B
How many try cocks are installed on the water column of a boiler, with over 9.3 square
meters of heating surface?
a) 1
b) 2
c) 3
d) 4
e) 6 - CORRECT ANSWER c
The purpose of a bowl at the bottom of the water colum is to:
, a) serve as a condenser
b) serve as a sediment chamber
c) serve as a siphon
d) as a reservoir
e) none of the above - CORRECT ANSWER b
Separately mounted gauge glasses are used to provide a _______ indication of level
over a certain vertical distance on the vessel:
a) point
b) continuous
c) diagonal
d) ultrasonic
e) indirect - CORRECT ANSWER b
In a high pressure horizontal firetube steam boiler, the bottom of the gauge glass should
be ____________ above the lowest permissible water level in the boiler.
a) 1 m
b) 50 cm
c) 47 cm
d) 25.4 mm
e) 51 mm - CORRECT ANSWER e
If a gauge glass breaks, the first action by the operator should be to:
a) close the gauge glass isolation valves
b) call his supervisor
c) shut down the boiler
d) place the spare gauge glass in service - CORRECT ANSWER a
For pressure above 2800 kPa a gauge glass housing is constructed of:
A) cast iron
B) brass
C) steel
D) aluminum
E) stainless steel - CORRECT ANSWER c
A great advantage of an Igema level indicator over a Hopkinson unit is:
a) it has the highest degree of accuracy
b) it is the least costly to purchase
c) its ability to show steam and water as different colors
d) there are no moving parts
