BLRS 6016 - Watertube Boilers (Chp 1)

Question 1

An advantage of a packaged watertube boiler is:
A) It is only available with straight tubes
B) It does not use softened water
C) A single supplier provides all components
D) No steam space is required
E) It is custom built on site

Answer 1

C) A ‘‘single supplier’’ provides all components

Question 2

The combustion chamber of a serpentine tube watertube boiler:
A) Is located below the tubes
B) Is located above the tube
C) Is surrounded by the tube
D) Has inefficient heat transfer
E) Is enclosed by a non-insulated metal casing

Answer 2

A) Is located below the tubes

Question 3

In comparison to a firetube boiler, a watertube boiler of the same capacity is:
A) Less destructive in the event of a pressure part failure
B) More destructive in the event of a pressure part failure
C) Less destructive in the event of a furnace explosion
D) There is no difference between the two types of boiler
E) More destructive in the event of a furnace explosion

Answer 3

A) “Less destructive” in the event of a “pressure part failure”

Question 4

A watertube boiler:

A) Has tubes surrounded by combustion gases
B) Is a boiler consisting of tubes within a shell
C) Tends to have higher stack temperatures
D) Has tubes surrounded by water
E) Contains combustion gases within the tubes

Answer 4

A) Has tubes “surrounded by combustion gases”

Question 5

In comparison to a firetube boiler, a watertube boiler of the same capacity:
A) Is more expensive to construct
B) Is less expensive to construct
C) Has little difference in expense or efficiency
D) Is more efficient
E) Is less efficient

Answer 5

A) Is more “expensive” to construct

Question 6

The upper drum/top end of a packaged watertube steam boiler is referred to as the:

A) Pressure drum
B) Mud drum
C) Blowoff drum
D) Water drum
E) Steam drum

Answer 6

E) Steam drum

Note: Steam Drum is a “standard feature of a water-tube boiler.” It is a reservoir of water/steam at the “top end” of the water tubes. The drum stores the steam generated in the water tubes and acts as a phase-separator for the steam/water mixture.

Question 7

Boiler circulation is driven by:
A) Heat
B) Water density difference
C) All of the answers shown
D) Tubing arrangement
E) Formation of steam in the tubes

Answer 7

C) All of the answers shown

Question 8

In comparison to a firetube boiler, a watertube boiler of the same capacity”:
A) As a higher reserve steam capacity
B) Can respond to load changes more quickly
C) There is no difference in steam generating capability
D) Is slow to generate steam pressure
E) Contains more water

Answer 8

B) Can respond to load changes more quickly

Note: “OF THE SAME CAPACITY”

Question 9

In order to keep dissolved solids concentrations within safe limits the packaged tubular steam boiler utilizes a/an:

A) Automatic blowdown
B) Desalinator
C) Liquid flow control device
D) Water softener after the condensate receiverE) Mixing chamber before the heating coil

Answer 9

A) Automatic blowdown

An automatic blowdown-control system optimizes surface-blowdown rates by regulating the volume of water discharged from the boiler in relation to the concentration of dissolved solids present

Question 10

A “disadvantage of the watertube” or tubular boiler is:

A) Water treatment monitoring
B) Its long warm-up period
C) Its high maintenance cost
D) Its thermal stresses
E) The foundation requirements due to mass

Answer 10

A) Water treatment monitoring

Take Note: “Disadvantage of Watertube Boiler”

Question 11

A watertube boiler is a boiler in which:
A) Air passes around the tubes
B) Air passes through the tubes
C) Water passes through the tubes
D) Water passes around the tubes
E) Combustion gases pass through the tubes

Answer 11

C) Water “passes through the tubes”

Question 12

A reason for preferring copper tubing in a tubular boiler is:
A) Corrosion resistance
B) Ease of replacement of the tubes
C) Elimination of feedwater treatment
D) High metal expansion rate
E) Low cost

Answer 12

A) Corrosion resistance

Question 13

The bent tube boiler design allows the tubes to create waterwalls that connect:

A) Threaded
B) Seamless
C) Welded
D) Pressure sealed

Answer 13

A) Threaded

Question 14

Three common types of bent tube watertube boilers are:
A) B, D and O
B) A, O and D
C) B, O and D
D) O, D and E
E) D, O and L
B) A, O and D

Answer 14

B) A, O and D

Question 15

Feedwater that is fed into the boiler to replace water that has been converted into steam is called:
A) Fresh water
B) Condensate
C) Softened water
D) Reused water
E) Return water

Answer 15

C) Softened water

Question 16

Boiler fireside baffles:

A) Are installed in every boiler furnace
B) Direct the flue gases through the boiler furnace
C) Will increase the stack temperature
D) Are used with firetube boilers only
E) Are installed in large boiler furnaces only

Answer 16

B) Direct the flue gases through the boiler furnace

Question 17

The copper tube tubular boiler:
A) Is capable of very large capacities
B) Has the furnace in the upper section
C) Is highly susceptible to corrosion
D) Can be gas or oil fired
E) Has one part heating surface

Answer 17

D) Can be gas or oil fired

Question 18

Pan-Global Book

One reason that low capacity watertube boilers are “seldom used for low pressure” heating is that:

a. )Require less supervision
b. )Cost less
c. )Have the Flue gas flowing inside the tubes
d. )Require “MORE SUPERVISION” for water treatment

Answer 18

d.)Require “MORE SUPERVISION” for water treatment

Question 19

The heating surface of a copper-tubular boiler consists of:

a. )Drums and Headers
b. )A Continuous Copper Tube
c) Straight firetubes
d. Bent tubes attached to the drums

Answer 19

.)A Continuous Copper Tube

Question 20

The type of watertube boiler that has an UPPER DRUM and TWO LOWER drums is a _______type:

a. )”O”
b. )”B”
c. )”A”
d. )”D”

Answer 20

c.)”A”

“A” Boiler has an UPPER DRUM and 2 LOWER DRUMS

Question 21

An advantage of a packaged boiler would be:

a. )Ease of Installation
b. )Constructed entirely on site
c. )It can be built to any height
d. )No water treatment required

Answer 21

a.)Ease of Installation

Question 22

The purpose of attaching “FINS” to watertube is to

a. )Provide for swirling action of the flue gases
b. )Increase the heating surface
c. )Increase the strength of the tubes
d. )Provide for better water circulation

Answer 22

v b.)Increase the “heating surface”

Question 23

1.The copper tubular boiler finds application in:

1. Residential hot water heating systems
2. Commercial hot water heating systems
3. Industrial hot water heating systems
4. Domestic hot water supply
5. High pressure steam production
   A. 1, 2, 3
   B. 2, 3, 4
   C. 3, 4, 5
   D. 1,2, 4
   E. 1, 2, 3, 5

Answer 23

D. 1,2, 4

“Residential,Commercial,Domestic”

Question 24

2.The "longitudinal drum boiler" is a \_\_\_\_\_ combustion gas pass boiler.
A. One
B. Two
C. Three
D. Four
E. Five

Answer 24

C. Three

longitudinal drum boiler has TWO (2) combustion

Question 25

3.The tubes of a serpentine watertube boiler are connected to the upper and lowerheaders by:
A. Welding
B. Silver solder
C. Four bolt flanges
D. Crosby clips
E. Threaded connections

Answer 25

E. Threaded connections

Note:This for SERPENTINE WATERETUBE BOILER