4B Power Engineering: Unit 3 - Boiler Safety Devices Questions and
Answers with Verified Solutions | Latest Update
QUESTION
Pressure relief valve is a device designed to actuate on:
a. outlet static pressure
b. inlet static pressure
c. inlet dynamic pressure
d. outlet dynamic pressure
Answer:
b
QUESTION
As per ASME PTC-25, a PRV that may be actuated by pressure or temperature at valve inlet is a:
a. safety relief valve
b. safety valve
c. temperature & pressure relief valve
d. pressure relief valve
Answer:
c
QUESTION
A Relief Valve is a PRV characterized by only gradual opening that is _________.
a. proportional to the increase in pressure
b. proportional to the decrease in pressure
c. inversely proportional to the increase in pressure
d. inversely proportional to the decrease in pressure
Answer:
a
QUESTION
As per ASME PTC-25, a Relief Valve is normally used for:
a. compressible fluid
b. low temperature fluid
c. incompressible fluid
d. high temperature fluid
Answer:
c
,QUESTION
As per ASME PTC-25, a Safety Valve is characterized by _________ opening and normally used
for ________.
a. gradual, compressible fluids
b. rapid, compressible fluids
c. gradual, incompressible fluids
d. rapid, incompressible fluids
Answer:
b
QUESTION
As per ASME BPVC 1, each boiler should have at least _______ PRV.
a. 1
b. 2
c. 3
d. 4
Answer:
a
QUESTION
Each boiler should have at least two or more PRV if it has over _________ of bare tube
water-heating surface.
a. 50 sq.m
b. 53 sq.m
c. 40 sq.m
d. 47 sq.m
Answer:
d
QUESTION
An electric boiler must have a power input over ________ to have at least two or more PRVs.
a. 1000 kW
b. 1050 kW
c. 1100 kW
d. 1125 kW
Answer:
c
,QUESTION
The set pressure of a superheater safety valve must take into consideration that the steam pressure
will drop as it flows from the _________ to the _________.
a. mud drum, superheater outlet
b. mud drum, superheater inlet
c. steam drum, superheater inlet
d. steam drum, superheater outlet
Answer:
d
QUESTION
A _________ situation would stop the steam flow through the superheater.
a. underpressure
b. overpressure
c. pressure drop
d. temperature drop
Answer:
b
QUESTION
To ensure the superheater to always have steam flow, the superheater PRV must open ________
the drum PRVs do, and close _______ the drum PRVs.
a. after, before
b. before, after
c. after, after
d. before, before
Answer:
b
QUESTION
Safety valves are commonly found on:
a. steam boilers & lines
b. compressed air vessels
c. refrigerant receivers
d. all options
Answer:
d
, QUESTION
Safety valves used for lower pressures and temperatures are made of:
a. cast iron and bronze
b. cast iron and brass
c. steel and aluminum
d. stainless steel and bronze
Answer:
a
QUESTION
As per ASME BPVC Sec. 1 PG-73, valves with bronze parts are not to be used for superheaters
operating over:
a. 250
b. 240
c. 230
d. 300
Answer:
c
QUESTION
Superheater and reheater PRVs are to be made of:
a. steel & alloy steel
b. cast iron & bronze
c. aluminum & bronze
d. cast iron & brass
Answer:
a
QUESTION
Manual lifting or opening of the valve is only allowed when it has a pressure of at least ________
of the boiler operating pressure.
a. 70%
b. 75%
c. 60%
d. 55%
Answer:
b
Answers with Verified Solutions | Latest Update
QUESTION
Pressure relief valve is a device designed to actuate on:
a. outlet static pressure
b. inlet static pressure
c. inlet dynamic pressure
d. outlet dynamic pressure
Answer:
b
QUESTION
As per ASME PTC-25, a PRV that may be actuated by pressure or temperature at valve inlet is a:
a. safety relief valve
b. safety valve
c. temperature & pressure relief valve
d. pressure relief valve
Answer:
c
QUESTION
A Relief Valve is a PRV characterized by only gradual opening that is _________.
a. proportional to the increase in pressure
b. proportional to the decrease in pressure
c. inversely proportional to the increase in pressure
d. inversely proportional to the decrease in pressure
Answer:
a
QUESTION
As per ASME PTC-25, a Relief Valve is normally used for:
a. compressible fluid
b. low temperature fluid
c. incompressible fluid
d. high temperature fluid
Answer:
c
,QUESTION
As per ASME PTC-25, a Safety Valve is characterized by _________ opening and normally used
for ________.
a. gradual, compressible fluids
b. rapid, compressible fluids
c. gradual, incompressible fluids
d. rapid, incompressible fluids
Answer:
b
QUESTION
As per ASME BPVC 1, each boiler should have at least _______ PRV.
a. 1
b. 2
c. 3
d. 4
Answer:
a
QUESTION
Each boiler should have at least two or more PRV if it has over _________ of bare tube
water-heating surface.
a. 50 sq.m
b. 53 sq.m
c. 40 sq.m
d. 47 sq.m
Answer:
d
QUESTION
An electric boiler must have a power input over ________ to have at least two or more PRVs.
a. 1000 kW
b. 1050 kW
c. 1100 kW
d. 1125 kW
Answer:
c
,QUESTION
The set pressure of a superheater safety valve must take into consideration that the steam pressure
will drop as it flows from the _________ to the _________.
a. mud drum, superheater outlet
b. mud drum, superheater inlet
c. steam drum, superheater inlet
d. steam drum, superheater outlet
Answer:
d
QUESTION
A _________ situation would stop the steam flow through the superheater.
a. underpressure
b. overpressure
c. pressure drop
d. temperature drop
Answer:
b
QUESTION
To ensure the superheater to always have steam flow, the superheater PRV must open ________
the drum PRVs do, and close _______ the drum PRVs.
a. after, before
b. before, after
c. after, after
d. before, before
Answer:
b
QUESTION
Safety valves are commonly found on:
a. steam boilers & lines
b. compressed air vessels
c. refrigerant receivers
d. all options
Answer:
d
, QUESTION
Safety valves used for lower pressures and temperatures are made of:
a. cast iron and bronze
b. cast iron and brass
c. steel and aluminum
d. stainless steel and bronze
Answer:
a
QUESTION
As per ASME BPVC Sec. 1 PG-73, valves with bronze parts are not to be used for superheaters
operating over:
a. 250
b. 240
c. 230
d. 300
Answer:
c
QUESTION
Superheater and reheater PRVs are to be made of:
a. steel & alloy steel
b. cast iron & bronze
c. aluminum & bronze
d. cast iron & brass
Answer:
a
QUESTION
Manual lifting or opening of the valve is only allowed when it has a pressure of at least ________
of the boiler operating pressure.
a. 70%
b. 75%
c. 60%
d. 55%
Answer:
b
