When cooling down a steam boiler that has been taken out of service, a vent valve on the steam drum should be opened to

When cooling down a steam boiler that has been taken out of service, a vent valve on the steam drum should be opened to

a) prevent a vacuum from forming in the boiler
b) release the air from the boiler
c) purge the shell of impure gases
d) let the operator know when the pressure has reached zero
e) prevent pressure build-up in the boiler

Answer: A

On boiler cool-down the vent should be opened

On boiler cool-down the vent should be opened

a) as soon as the post-purge is completed
b) when all temperatures are at ambient value
c) any time after the NRV is closed
d) just before the unit goes into a vacuum
e) at no time

Answer: D

Before removing a boiler from service for maintenance purposes it is beneficial to

Before removing a boiler from service for maintenance purposes it is beneficial to

a) inform the Chief Inspector
b) do as little as possible with the waterside of the unit
c) use sootblowers and clean the fireside well
d) force cool the unit with post-purge air
e) drain the unit before the water cools to ambient temperature

Answer: C

Two boilers are feeding into the same steam header and each pressure gage shows a pressure of 350 kPa. The steam pressure gage on the header will indicate

Two boilers are feeding into the same steam header and each pressure gage shows a pressure of 350 kPa. The steam pressure gage on the header will indicate

a) slightly more than 350 kPa
b) 700 kPa
c) slightly more than 700 kPa
d) slightly less than 350 kPa
e) slightly less than 700 kPa

Answer: D

When raising pressure in a firetube boiler you should: 1. raise steam slowly 2. raise steam as rapidly as possible 3. check the furnace frequently 4. check the system for leaks

When raising pressure in a firetube boiler you should:
1. raise steam slowly
2. raise steam as rapidly as possible
3. check the furnace frequently
4. check the system for leaks

a) 2, 3, 4
b) 1, 2, 3, 4
c) 1, 3, 4
d) 1, 2, 3
e) 2, 4

Answer: C

While a boiler is warming up it is good practice to

While a boiler is warming up it is good practice to

a) leave all drain valves closed
b) check the low water fuel cut-off device for proper operation
c) test the safety valve before any pressure develops
d) not interfere in any way with the combustion process
e) go through a sootblowing operation sequence

Answer: B

A boiler warm-up should

A boiler warm-up should

a) be done as quickly as possible
b) be done with low water so that metal heats up faster
c) be done slowly to minimize any differential expansion
d) be completed with a high firing rate
e) not involve any human intervention

Answer: C

When igniting a gas or oil fired boiler you should ignite from: 1. another burner already in service 2. the hot refractory 3. a hand torch 4. an electrical igniter

When igniting a gas or oil fired boiler you should ignite from:
1. another burner already in service
2. the hot refractory
3. a hand torch
4. an electrical igniter

a) 1, 2
b) 1, 3
c) 2, 3
d) 1, 2, 4
e) 3, 4

Answer: E

A boiler furnace pre-purge

A boiler furnace pre-purge

a) is the shortest step in the start-up sequence
b) can take place normally even if there is a low water condition
c) must be done manually on a fully automatic boiler
d) must last a specific amount of time
e) will take place at the end of a boiler shutdown

Answer: D

Superheater vents are usually opened before firing a boiler to

Superheater vents are usually opened before firing a boiler to

a) allow the superheater to warm up quicker
b) let the first steam produced act as a superheater coolant
c) ensure drum level does not drop
d) verify the operation of the steam flow transmitter
e) enhance boiler water circulation

Answer: B

On a boiler fuel system having a double block and bleed set-up

On a boiler fuel system having a double block and bleed set-up

a) the vent valve is a normally open valve
b) at least one of the main-line valves will always be open
c) the main-line valves will open before the prepurge stage
d) the main-line and vent valves all open together
e) the main-line valves are manually operated

Answer: A

Boiler dry-out means

Boiler dry-out means

a) drying out the top and bottom drum
b) igniting the dryers in the top drum
c) drying out the new refractory
d) empty the boiler out
e) drying out the entire boiler before start-up

Answer: C

Boiler boiling out procedure should be done

Boiler boiling out procedure should be done

a) at operating pressure
b) before the dry out procedure
c) at one-half the operating pressure
d) once a year
e) just before the annual inspection

Answer: C

Before lighting up a boiler you should: 1) purge the furnace 2) open the blow down valve 3) check the fuel supply 4) fill the boiler with water

Before lighting up a boiler you should:
1) purge the furnace
2) open the blow down valve
3) check the fuel supply
4) fill the boiler with water

a) 1, 2, 4
b) 2, 3, 4
c) 1, 2, 3, 4
d) 1, 3, 4
e) 2, 3

Answer: D

If a new boiler is not properly boiled out, it may result in

If a new boiler is not properly boiled out, it may result in

a) tubes rupturing
b) a furnace explosion
c) nuisance shutdowns
d) an unwanted high rate of water circulation
e) a foaming condition occurring

Answer: E

The first duty of the operator coming on shift is to

The first duty of the operator coming on shift is to

a) check the safety valve settings
b) fill out the log book
c) check that water column and gage glass connections are clear
d) talk to his supervisor
e) check the chemical tank levels

Answer: C

A boiler inspection

A boiler inspection

a) must be done after every shut down of the boiler
b) must be done when the boiler inspector requests it
c) must be done every two years
d) is done with the owner's permission only
e) must be done before the boiler is ready for start-up

Answer: B

The external inspection of a boiler

The external inspection of a boiler

a) may include making sure the valves are in good operating condition
b) may include making sure the furnace refractory is in order
c) may include making sure the tubes are free of scale
d) must be done after the boiler has been drained
e) may include making sure the exterior of the tubes are in good condition

Answer: A

New refractory must be thoroughly and properly cured with a light fire because

New refractory must be thoroughly and properly cured with a light fire because

a) of its high rate of differential expansion
b) it may burn if not cured
c) it may corrode if not cured
d) it contains moisture which can cause it to fracture if not cured
e) of the length of time it takes it to heat up

Answer: D

Before starting up any boiler it is necessary that

Before starting up any boiler it is necessary that

a) it be properly warmed up
b) it be properly purged
c) it have a valid inspection certificate
d) the water supply system be in service
e) the waterside is boiled out

Answer: C