The internal feed pipe: 1. Serves to distribute the incoming feedwater uniformly along the length of the drum 2. Helps prevent scale build up 3. Prevents temperature shock 4. Helps prevent turbulence
1,3,4
2,3,4
1,2,3
2,3,
1,2,4
Which of the following is the correct procedure, when blowing down a boiler with both a quick-opening and a slow-opening blow-off valve?
open the slow opening valve, then open the quick opening valve, After blowing down: close the quick opening valve, then close the slow opening valve
open the quick opening valve, then open the slow opening valve, after blowing down: close the quick opening valve then close the slow opening valve
open the quick opening valve, then open the slow opening valve. after blowing down: close the slow opening valve then close the quick opening valve
open the slow opening valve, then open the quick opening valve. After blowing down: close the slow opening valve, then close the quick opening valve
it does not matter which valve is opened first, after blowing down: it does not matter which valve is closed first
The blow-off connection to a boiler. 1. is made4 to the lowest point of the boiler 2. is used to drain the boiler 3. is used to blow out mud an sediment. 4. is used to lower the concentration of dissolved impurities
1,2,3,4
A boiler explosion due to overheating of the heating surfaces may result from:
Improper furnace purge
A faulty low gas pressure switch
A low-water cut-off malfunction
combustion air switch failure
A faulty flame scanner
The purpose of the continuous blow-down connection is to:
Lower the concentration of dissolved solids in the boiler water
keep the water at the correct level in the gauge glass
keep the steam pressure correct
blow the sludge out of the mud drum
lower the boiler feed water flow to the boiler
The piping between the non-return valve and the stop valve has a drain valve: 1. To help warm up the header 2. To indicate if there is steam flowing from the boiler 3. To indicate the pressure in the line 4. To drain the condensate out of the header
1,2
1,3
1,4
When a boiler has a quick-opening and a slow-opening blow-off valve. 1. The slow-opening valve is next to the boiler 2. The quick-opening valve is next to the boiler 3. It does not matter which one is next to the boiler 4. It does matter which one is next to the boiler
3
2,4
Which of the following do not require steam stop valves? 1. safety valve 2. Main steam header 3. Reheater 4. Superheater
A low water fuel cut-off device: 1. Shuts the fuel off to the boiler when the air flow drops 2. Shuts the fuel off when the burner pressure is low 3. Protects the boiler from overheating 4. Shuts the main fuel valve during a low water condition
2,3
3,4
Every steam boiler having a working pressure exceeding 103 kPa: 1. Shall be equipped with two approved blow-off valves 2. Must have at least one slow-opening blow-off valve 3. Must have two slow-opening blow-off valves 4. Must have two quick-opening blow-off valves
