Book 1 Unit 2

Question 1

The procedure for testing a directly connected gauge glass would be:
1. Close the gauge water valve
2. Open the gauge water valve
3. Close the gauge steam valve
4. Open the gauge steam valve
5. Close the gauge drain valve
6. Open the gauge drain valve
7. Proving steam passage is clear
8. Proving water passage is clear

A) 1,6,7,3,8,5
B) 1,6,7,2,8,3
C) 3,6,8,4,1,7,2
D) 3,6,8,2,7,5
E) 1,6,7,3,2,8,5

Answer 1

E) 1,6,7,3,2,8,5

Question 2

The low water level fuel cut-off will shut off the fuel to the heating boiler when the water level drops below:
A) 50 mm (2 in) above the bottom of the gauge glass
B) The lowest visible part of the gauge glass
C) The lowest permissible water level
D) 25 mm (1in) above the bottom of the gauge glass
E) One half of the gauge glass

Answer 2

B) The lowest visible part of the gauge glass

Question 3

The flame rod method of sensing is often referred to as:
A) Photoelectric scanning
B) The ionizing particle principle
C) Flame rectification
D) Infrared detection
E) Ultraviolet detection

Answer 3

C) Flame rectification

Question 4

Quick closing gauge glass valves are operated by:
A) Levers and chains
B) Valve rods
C) Solenoids
D) Actuators
E) Diaphragms

Answer 4

A) Levers and chains

Question 5

A pressure gauge can most accurately be calibrated by using:
A) The inspector’s test gauge
B) Hydraulic compactor
C) A test gauge comparator
D) A dead weight tester
E) Another pressure gauge

Answer 5

D) A dead weight tester

Question 6

The Inspector’s test gauge is used to:
A) Test the pressure on the boiler
B) Confirm the pressure shown on the boiler pressure gauge
C) Measure the pressure on the boiler
D) Confirm that there is pressure on the boiler
E) Calibrate the pressure gauge on the boiler

Answer 6

B) Confirm the pressure shown on the boiler pressure gauge

Question 7

In a gas fired boiler the fuel enters the furnace in a ___________ state mixes with combustion air and is ignited.
A) Solid
B) Vapourized
C) Liquid
D) Mixed
E) Gaseous

Answer 7

E) Gaseous

Question 8

In an oil fired boiler the fuel enters the furnace in a ___________ state mixes with combustion air and is ignited.
A) Mixed
B) Liquid
C) Gaseous
D) Solid
E) Vapourized

Answer 8

E) Vapourized

Question 9

The blowdown tank is/does:
A) Is not required on a low pressure boiler
B) Not cool the water
C) Does not allow the pressure to be reduced
D) Does not empty into the sewer

Answer 9

A) Is not required on a low pressure boiler

Question 10

A programming control on a natural draft gas fires boiler operates in the following sequence.
1. The main burner is ignited
2. The flame detector senses the flame and causes the main gas valve to open
3. The ignition transformer and pilot gas valve are de-energized and closed, if an interrupted pilot is used
4. The operating control initiates a startup
5. The load relay energizes the ignition transformer and the pilot gas valve

A) 3,2,1,5,4
B) 2,5,1,4,3
C) 1,2,3,4,5
D) 5,3,2,1,4
E) 4,5,2,1,3

Answer 10

E) 4,5,2,1,3

Question 11

When installing a pressure gauge and siphon on a boiler it is important to:
A) Fill the siphon with instrument oil
B) Allow the steam to condense in the siphon
C) Slowly open the valve to fill the siphon with steam
D) Fill the siphon with water first
E) Slowly open the valve to fill the siphon with water

Answer 11

D) Fill the siphon with water first

Question 12

The voltage supply generated by the thermocouple is usually not more than:
A) 0 millivolts
B) 50 millivolts
C) 15 millivolts
D) 100 millivolts
E) 30 millivolts

Answer 12

E) 30 millivolts

Question 13

Possible causes of low water level include:
1. Leaks cause by breakage or corrosion
2. Excessive blowdown
3. Automatic feedwater valve passing
4. Boiler feed pump failure
5. Excessive make-up

A) 1,2,4
B) 2,3,5
C) 2,3,4
D) 3,4,5
E) 1,2,3

Answer 13

A) 1,2,4

Question 14

The purpose of the expansion tank in a hot water heating system is to:
A) Provide storage space for excess water
B) Provide storage space for excess steam
C) Add make-up water to the system
D) Provide space to store the returning condensate
E) Separate the water and steam produced

Answer 14

A) Provide storage space for excess water

Question 15

A safety valve must be mounted:
1. In the horizontal position
2. To the boiler by a short nipple
3. At the highest practicable part of the boiler
4. With discharge water properly drained
5. With a valve next to the boiler

A) 2,3,4
B) 1,3,5
C) 2,4,5
D) 3,4,5
E) 1,2,3

Answer 15

A) 2,3,4

Question 16

The hot water heating boiler burner control uses the ________ as the sensed variable.
A) Boiler steam temperature
B) Boiler water temperature
C) Feedwater pressure
D) Boiler water pressure
E) Drum water level

Answer 16

B) Boiler water temperature

Question 17

The scanner is mounted as close to the flame as physically possible without subjecting it to a temperature over:
A) 150ºC (302ºF)
B) 75ºC (167ºF)
C) 120ºC (248ºF)
D) 50ºC (98ºF)
E) 100ºC (212ºF)

Answer 17

E) 100ºC (212ºF)

Question 18

If the steam passage to the boiler gauge glass becomes obstructed:
A) The steam level in the glass will fall
B) There will be no change
C) The water level in the glass will fall
D) The steam level in the glass will rise
E) The water level in the glass will rise

Answer 18

E) The water level in the glass will rise

Question 19

The most commonly used flame detection devices are:
1. Ultraviolet detectors
2. Thermocouples
3. Flame rods
4. Infrared detectors
5. Photoelectric cells

A) 1,2,4
B) 3,4,5
C) 2,3,4
D) 1,2,3
E) 2,3,5

Answer 19

E) 2,3,5

Question 20

If the pilot flame fails, no power is generated by the thermocouple preventing the __________ from supplying fuel to the burner on boiler startup.
A) Pilot fuel control valve
B) Main fuel control valve
C) Main relay valve
D) Operating control
E) Air supply valve

Answer 20

B) Main fuel control valve