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4th Class Power Engineering Unit B3 Boiler Safety Devices.
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4th Class Power Engineering Unit B3 Boiler Safety Devices.4th Class Power Engineering Unit B3 Boiler Safety Devices.
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4th Class Power Engineering Unit B3 Boiler SafetyDevices.
According to ASME BPVC Section IV, pressure relief valves on potable hot water
heaters must be installed no lower than _________ from the top of the shell:
Select one:
A. 50 mm
B. 100 mm
C. 150 mm
D. 200 mm - Correct Answer b
In a pressure relief valve, the audible or visible escape of fluid between the seat and
disc, at an inlet pressure below the popping pressure of the valve, is known as:
Select one:
A. spatter
B. simmer
C. studded
D. shudder - Correct Answer b
It is recommended that the combination temperature and pressure relief valves on
potable hot water heaters receive _________ try lever tests:
Select one:
A. daily
B. weekly
C. monthly
D. yearly - Correct Answer d
This type of pressure relief device is characterized by rapid opening or by gradual
opening that is generally proportional to the increase in pressure. It can be used for
compressible or incompressible fluids:
Select one:
A. safety relief valve
B. check valve
C. needle valve
D. temperature relief valve - Correct Answer a
ASME PTC 25 defines this as the difference between actual popping pressure of a
pressure relief valve and actual reseating pressure, expressed as a percentage of set
pressure or in pressure units:
Select one:
A. blow down
B. blow off
C. blowout
D. reseating - Correct Answer a
,A handle used to apply a fore to the stem of a pressure relief valve, to manually open
the valve at a pressure below the set pressure, is known as a:
Select one:
A. relief lever
B. pop lever
C. hand lever
D. try lever - Correct Answer d
This section of the ASME code refers to safety relief valve requirements for industrial
and commercial potable water heaters: Select one:
a. ASME BPVC Section IV
b. ASME BPVC Section V
c. ASME BPVC Section VII
d. ASME BPVC Section VI - Correct Answer a
This type of valve automatically opens to relieve pressure and then automatically
recloses:
Select one:
A. check valve
B. rising stem valve
C. needle valve
D. safety valve - Correct Answer d
ASME BPVC IV Part HG-401 does not require low pressure steam safety valves to
have this:
Select one:
A. a body drain
B. a spring
C. an adjustable blow down
D. a locking screw - Correct Answer c
Water that is safe to drink is known as:
Select one:
A. tap water
B. clean water
C. soft water
D. potable water - Correct Answer d
This type of pressure relief valve testing is performed monthly on steam heating boilers:
Select one:
A. try lever test
B. pop test
C. hand test
D. inspector test - Correct Answer a
, Liquid at a saturation temperature greater than the saturation temperature at
atmospheric pressure is known as:
Select one:
A. highly saturated liquid
B. over saturated liquid
C. super saturated liquid
D. duel saturated liquid - Correct Answer c
ASME BPVC Section 1 prohibits the use of valves containing this type of metal, for
super heaters operating over 230oC:
Select one:
A. chromium vanadium steel
B. bronze
C. cast steel
D. nickel chromium steel - Correct Answer b
The full operation of the safety valve, including the exact pressure at which it opens and
closed, can be checked using the:
Select one:
A. try lever test
B. hand test
C. pop test
D. relief lever test - Correct Answer c
The lifting force exerted on the disc of a safety valve by the boiler pressure is dependent
on:
Select one:
A. the length of the disc exposed to the pressure
B. the amount of steam in the boiler
C. the seat diameter exposed to the pressure
D. the area of the disc exposed to the pressure - Correct Answer d
When performing a safety valve lever test, the boiler pressure must be at least
_________ of the normal operating pressure:
Select one:
a. 25%
b. 50%
c. 75%
d. 95% - Correct Answer c
This section of ASME contains the rules for safety valves and safety relief valves
installed on heating boilers:
Select one:
a. ASME BPVE Section V
b. ASME BPVE Section IV
c. ASME BPVE Section VI
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