Chapter 88

Question 0

Automatic boiler programming controls:
A) must incorporate a modulating control system
B) do not require interlocking devices
C) require an on off or multi range control switch
D) cannot make use of high low fire control
E) are not interconnected with the water level control system

Answer 0

C) require an on off or multi range control switch

Question 1

An interrupted pilot of an automatic boiler:
A) burns continuously, like that in a home furnace
B) lights before the main burner and goes out with it
C) is one which has been extinguished by a flame scanner
D) lights, completes a trial, and extinguishes after a main flame trial
E) must be manually ignited

Answer 1

D) lights, completes a trial, and extinguishes after a main flame trial

Question 2

Liquid fuel manual valves for an automatically controlled boiler should be opened:
A) prior to prepurging
B) after prepurge and just prior to pilot ignition
C) immediately after completion of the pilot flame trial
D) after the automatic main burner fuel valve opens
E) with the automatic main burner fuel valve

Answer 2

A) prior to prepurging

Question 3

During a programmed startup, if an igniter spark is visible but no pilot appears, the operator should suspect:
A) a boiler low water level
B) the main burner manual fuel valve is closed
C) the pilot manual fuel valve is closed
D) the scanner lead sulphide cell is weak
E) the boiler steam pressure operating control switch is open

Answer 3

C) the pilot manual fuel valve is closed

Question 4

If a boiler trips on low water level or flame failure, the programming controller will shut the boiler down. List the steps the operator must take before the boiler will restart.

Answer 4

The initial problem must be corrected

The operator may then need to press the reset button on the switch that initiated the boiler shutdown

Question 5

State the purpose of purging the boiler furnace before igniting the pilot flame.

Answer 5

Purging the boiler involves passing air through the furnace for a period of time to ensure that there are no combustible gases in the furnace when the pilot flame is ignited. These gases could cause a furnace explosion