BOILERS

    


       

1. Where is a fusible plug installed on a Scotch or  auxiliary boiler?/At or near the center of the crown sheet    of the combustion chamber.

2. Fusible plugs are installed in fire-tube boilers to   _____________./warn the engineer of low water level

3. If the combustion control system of an automatically fired auxiliary boiler fails to sustain burner ignition   after a normal shutdown, you should check for a/an __________./faulty photocell detector

4.Before any work is to be carried out on a burner in an  automatically fired auxiliary boiler, you should always  _____________./close all manually operated fuel valves

5.Generating tubes in waste heat boilers are finned to  ____________./increase the rate of heat transfer

6.If an operating auxiliary boiler has a water pH reading of 7, you should ______________./treat the water with caustic soda

7.Which of the following conditions is responsible for the fuel oil to atomize when using a steam atomizer in an  auxiliary boiler?/Expansion of the steam in the furnace.

8.A failure to any component of a flame safeguard control for an automatically fired auxiliary boiler, will result in  ______________./the prevention of automatic restart

9.When an auxiliary boiler is on the line, the output of the flame scanner can be checked by placing a microammeter in series with the photoelectric cell circuit. The readings on high fire should be ____________./higher than those at low fire

10.A feed pump for an auxiliary boiler might lose suction if the ____________./feedwater is too hot

11.The water in a steaming auxiliary boiler should be tested daily for ______________./chlorides

12.The programmed control system of an automatic auxiliary  boiler will terminate the light off process during the  prepurge period if air flow is not sensed and _________./the damper is not sufficiently open

13.The flame safeguard control system of a large automatic  auxiliary boiler will provide fuel shut off in the case of high ____________./steam pressure

14.The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to _________________./reduce corrosion in the heating coil

15.Coast Guard Regulations (46 CFR) require the controls for automatically fired auxiliary boilers, must be fitted with visible indicators to signal __________./fuel oil shutoff due to flameout

16.When a waste heat boiler is installed in the exhaust of a main propulsion diesel engine, the exhaust gas bypass would be used ____________./at low loads to prevent corrosion in the boiler

17.How is the concentration of dissolved oxygen in the   feedwater of an auxiliary boiler maintained at acceptable limits?/Oxygen is liberated by maintaining the highest practical feedwater temperature.

18.Which of the listed types of control systems is required by Coast Guard Regulations (46 CFR) for large automatic  auxiliary boiler heating equipment?/All of the above

19.Which of the following items is necessary for all waste heat boiler installations, regardless of design or manufacturer?/Control of evaporation

20.When it becomes necessary to replace any tubes in a   water-tube auxiliary boiler to eliminate leaks at the tube seats, the replacement tubes should be ____________./rolled, beaded, and seal welded around the bead edge

21.Automatic combustion control systems for some auxiliary  boilers are designed to cycle burners on in response to  ____________./low steam pressure

22.It is desirable for an auxiliary boiler safety valve to pop open and reseat quickly to __________./prevent wire drawing of the disc and seat

23.Coast Guard Regulation (46 CFR) requires that after   undergoing extensive repairs, an auxiliary boiler, with a maximum allowable working pressure of 60 psig (411.89 kPa), should be hydrostatically tested at a pressure of   ______________./90 psig (617.83 kPa)